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''Rissoa'' is a
genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...
of minute sea snails,
marine Marine is an adjective meaning of or pertaining to the sea or ocean. Marine or marines may refer to: Ocean * Maritime (disambiguation) * Marine art * Marine biology * Marine debris * Marine habitats * Marine life * Marine pollution Military * ...
gastropod
mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000  extant species of molluscs are recognized. The number of fossil species is es ...
s or
micromollusk A micromollusk is a shelled mollusk which is extremely small, even at full adult size. The word is usually, but not exclusively, applied to marine mollusks, although in addition, numerous species of land snails and freshwater mollusks also ...
s in the
family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the superfamily Rissooidea and the order Littorinimorpha. Distribution and habitat This family of snails is found worldwide. They ...
. The genus was first introduced by M. de Freminville for some small shells observed by M.
Antoine Risso Giuseppe Antonio Risso (8 April 1777 – 25 August 1845), called Antoine Risso, was a Niçard and naturalist. Risso was born in the city of Nice in the Duchy of Savoy, and studied under Giovanni Battista Balbis. He published ' (1810), ' (182 ...
, a distinguished naturalist of Nice, France. They were described by M. Demarest in 1814 in the "New Bulletin of the Philomatic Society".


Description

The soft body of the snail is elongated and spiral. The somewhat prolonged mouth has a
proboscis A proboscis () is an elongated appendage from the head of an animal, either a vertebrate or an invertebrate. In invertebrates, the term usually refers to tubular mouthparts used for feeding and sucking. In vertebrates, a proboscis is an elonga ...
. The tentacles are awl-shaped with the eyes on a small prominence near the base. The foot is oval or elliptical. The species is
phytophagous A herbivore is an animal anatomically and physiologically adapted to eating plant material, for example foliage or marine algae, for the main component of its diet. As a result of their plant diet, herbivorous animals typically have mouthpar ...
. The conical shell has an elongated
spire A spire is a tall, slender, pointed structure on top of a roof of a building or tower, especially at the summit of church steeples. A spire may have a square, circular, or polygonal plan, with a roughly conical or pyramidal shape. Spires are ...
with its
apex The apex is the highest point of something. The word may also refer to: Arts and media Fictional entities * Apex (comics), a teenaged super villainess in the Marvel Universe * Ape-X, a super-intelligent ape in the Squadron Supreme universe *Apex, ...
nipple-shaped. The size of the shell varies between 1 mm and 8 mm. The
whorls A whorl ( or ) is an individual circle, oval, volution or equivalent in a whorled pattern, which consists of a spiral or multiple concentric objects (including circles, ovals and arcs). Whorls in nature File:Photograph and axial plane floral d ...
are generally convex-shaped with a distinct suture. The
aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An ...
is ovate, roundish or pear-shaped with its anterior end rounded, the posterior end acute and with the
peristome Peristome (from the Greek ''peri'', meaning 'around' or 'about', and ''stoma'', 'mouth') is an anatomical feature that surrounds an opening to an organ or structure. Some plants, fungi, and shelled gastropods have peristomes. In mosses In mosses, ...
complete. The thin and horny operculum is spirally marked and equally ovate, roundish or pear-shaped. Macgillivray, William, History of the molluscous animals of Scotland, London, 1844
/ref>


Habitat

This species can be found on brown algae (genus ''
Fucus ''Fucus'' is a genus of brown algae found in the intertidal zones of rocky seashores almost throughout the world. Description and life cycle The thallus is perennial with an irregular or disc-shaped holdfast or with haptera. The erect portion o ...
''), in clefts of rocks, on stones, on mud or sand. Most will be found on sandy beaches along the line of the last tide.


Species

Species within the genus ''Rissoa'' include: * ''
Rissoa aartseni ''Rissoa aartseni'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' Verduin, 1985 * ''
Rissoa acerosa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Seguenza, 1903 * ''
Rissoa acutata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Schauroth, 1857 † * ''
Rissoa acuticosta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' (Sacco, 1895) † (
Homonymy In linguistics, homonyms are words which are homographs (words that share the same spelling, regardless of pronunciation), or homophones ( equivocal words, that share the same pronunciation, regardless of spelling), or both. Using this definition ...
junior secondary homonym of R. acuticosta Von Koenen, 1892, which seems to be a true Rissoa) * ''
Rissoa acuticosta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Von Koenen, 1892 † * ''
Rissoa adela ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' d'Orbigny, 1852 † * ''
Rissoa aethiopica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Thiele, 1925 * ''
Rissoa albugo ''Rissoa albugo'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the su ...
'' Watson, 1873 * † ''
Rissoa alienocurta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Lozouet, 1998 * ''
Rissoa alleryi ''Rissoa alleryi'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the s ...
'' (Nordsieck, 1972) * '' Rissoa alpina'' Gümbel, 1861 † * ''
Rissoa angusticostata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Sandberger, 1860 † * ''
Rissoa angustior ''Rissoa angustior'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in th ...
'' (Monterosato, 1917) (taxon inquirendum) * ''
Rissoa anomala ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Eichwald, 1830 † * ''
Rissoa arata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Philippi, 1849 * '' Rissoa athymorhyssa'' Dall, 1892 † * ''
Rissoa auriculata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Seguenza, 1903 * ''
Rissoa auriformis ''Rissoa auriformis'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in th ...
'' Pallary, 1904 * ''
Rissoa auriscalpium ''Rissoa auriscalpium'', common name the golden-capped risso, is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an opercu ...
'' (Linnaeus, 1758) * ''
Rissoa australis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' G. B. Sowerby II, 1877 * '' Rissoa baldacconii'' Cantraine, 1842 † * ''
Rissoa balliae ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' W. Thompson, 1840 * ''
Rissoa banatica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Jekelius, 1944 † * ''
Rissoa basisulcata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Etheridge & Bell in Bell, 1898 † * ''
Rissoa becki ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' W. H. Turton, 1933 * ''
Rissoa bissulca ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Buvignier, 1843 † * ''
Rissoa boytonensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Harmer, 1925 † * ''
Rissoa buccinalis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (Lamarck, 1804) † * '' Rissoa callistrophia'' Dall, 1892 † * ''
Rissoa candidata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' W. H. Turton, 1932 * ''
Rissoa certa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Svagrovský, 1971 † * ''
Rissoa clotho ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Hörnes, 1856 † * ''
Rissoa conica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' L. Périer, 1867 * ''
Rissoa conuloidea ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Etheridge & Bell in Bell, 1893 † * ''
Rissoa cooperi ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Tryon, 1865 * ''
Rissoa costeiensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Kowalke & Harzhauser, 2004 † * ''
Rissoa costellata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Grateloup, 1838 † * ''
Rissoa crefeldensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Wiechmann, 1874 † * ''
Rissoa crux ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Eichwald, 1853 † * ''
Rissoa cureti ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Cossmann, 1918 † * ''
Rissoa curta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Dall, 1927: (taxon inquirendum, non Dujardin, 1837) * ''
Rissoa curticostata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' S. V. Wood, 1848 † * '' Rissoa cylindrella'' Odhner, 1924 * ''
Rissoa decipiens ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Deshayes, 1861 † * ''
Rissoa decorata ''Rissoa decorata'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the su ...
'' Philippi, 1846 * ''
Rissoa decorticata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Landau, Ceulemans & Van Dingenen, 2018 † * ''
Rissoa degrangei ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (Cossmann & Peyrot, 1919) † * ''
Rissoa densecosta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Etheridge & Bell in Bell, 1893 † * ''
Rissoa dilemma ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' O. Boettger, 1907 † * ''
Rissoa dissimilis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Harmer, 1920 † * ''
Rissoa dobrogica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Necrasov, 1936 * ''
Rissoa duboisii ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Nyst, 1845 † * ''
Rissoa dupiniana ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' d'Orbigny, 1842 † * ''
Rissoa electrae ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Manousis, 2019 * ''
Rissoa elegantula ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Piette, 1857 † * ''
Rissoa epulata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Pilsbry & C. W. Johnson, 1917 † *
Rissoa eurydictium ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
Cossmann, 1888 † * ''
Rissoa euxinica ''Rissoa euxinica'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the su ...
'' Milaschevich, 1909 * ''
Rissoa exigua ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Eichwald, 1830 † * ''
Rissoa flexuosa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Von Koenen, 1892 † * ''
Rissoa fragilis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (Lamarck, 1804) † * ''
Rissoa fraterna ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Wiechmann, 1874 † * ''
Rissoa frauenfeldiana ''Rissoa frauenfeldiana'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks i ...
'' Brusina, 1868 * ''
Rissoa gemmula ''Rissoa gemmula'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the sup ...
'' Fischer P. in de Folin, 1869 * ''
Rissoa geraea ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Dall, 1892 † * ''
Rissoa gibsoni ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' T. Brown, 1841 † * ''
Rissoa glabrata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' G. B. Sowerby II, 1859 * ''
Rissoa goepperti ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Schauroth, 1857 † * ''
Rissoa gomerica ''Rissoa gomerica'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' (Nordsieck & Talavera, 1979) * '' Rissoa gracilicosta'' Etheridge & Bell in Bell, 1893 † * ''
Rissoa granulum ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Philippi, 1844 (taxon inquirendum) * ''
Rissoa guerinii ''Rissoa guerinii'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the su ...
'' Récluz, 1843 * ''
Rissoa guernei ''Rissoa guernei'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the s ...
'' Dautzenberg, 1889 * ''
Rissoa harmeri ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Faber, 2018 † * ''
Rissoa hebes ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' O. Boettger, 1907 † * ''
Rissoa hidasensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Csepreghy-Meznerics, 1950 † * ''
Rissoa houdasi ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Cossmann, 1907 * ''
Rissoa ilca ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Thiele, 1925 * ''
Rissoa inchoata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Deshayes, 1861 † * ''
Rissoa incompta ''Rissoa'' is a genus of minute sea snails, marine (ocean), marine gastropod mollusks or micromollusks in the family (biology), family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Ri ...
'' A. A. Gould, 1862 * ''
Rissoa incrassata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' J. Müller, 1851 † * ''
Rissoa inflexicosta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (Cossmann, 1921) † * '' Rissoa infrastriolata'' Thiele, 1925 * ''
Rissoa innocens ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' W. H. Turton, 1932 * ''
Rissoa intermedia ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Grateloup, 1838 † * '' Rissoa intusstriata'' Etheridge & Bell in Bell, 1893 † * ''
Rissoa irritans ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Thiele, 1925 * ''
Rissoa italiensis ''Rissoa italiensis'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in th ...
'' Verduin, 1985 * ''
Rissoa janusi ''Rissoa janusi'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the supe ...
'' (Nordsieck, 1972) * ''
Rissoa jurensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Etallon, 1862 † * ''
Rissoa karsteni ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' R. Janssen, 1978 † * ''
Rissoa latior ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (Mighels & C. B. Adams, 1844) * ''
Rissoa leighi ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' T. Brown, 1841 † * ''
Rissoa lia ''Rissoa lia'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the superfa ...
'' (Monterosato, 1884) * ''
Rissoa lilacina ''Rissoa lilacina'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae. Description Distribution This marine species occurs at the south coast of the Channel in Calvados and Finistère F ...
'' Récluz, 1843 * ''
Rissoa lipeus ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Dall, 1892 † * ''
Rissoa lusoria ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Yokoyama, 1926 † * ''
Rissoa macra ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' R. B. Watson, 1886 * ''
Rissoa maya ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Yokoyama, 1926 † * ''
Rissoa membranacea ''Rissoa membranacea'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in ...
'' (Adams J., 1800) * Rissoa microcharia Dall, 1892 † * ''
Rissoa mirabilis ''Rissoa mirabilis'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' Manzoni, 1868 * ''
Rissoa misera ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Deshayes, 1861 † * ''
Rissoa mitreola ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Eichwald, 1853 † * ''
Rissoa modesta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' (H. C. Lea, 1845) * ''
Rissoa monodonta ''Rissoa monodonta'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' Philippi, 1836 * ''
Rissoa moreana ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Buvignier, 1852 † * ''
Rissoa mosensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Buvignier, 1852 † * ''
Rissoa mucronata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Svagrovský, 1971 † * ''
Rissoa multicincta ''Rissoa multicincta'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in t ...
'' (Smriglio & Mariottini, 1995) * ''
Rissoa multicostata ''Rissoa multicostata'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in ...
'' (Nordsieck & Talavera, 1979) * ''
Rissoa munieri ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Szöts, 1953 † * ''
Rissoa nina ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Nordsieck, 1972 (nomen dubium) * ''
Rissoa obeliscoides ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Landau, Ceulemans & Van Dingenen, 2018 † * ''
Rissoa obeliscus ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' May, 1915 * ''
Rissoa obtusa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' T. Brown, 1841 † * '' Rissoa olangoensis'' Poppe, Tagaro & Stahlschmidt, 2015 * ''
Rissoa oldhamiana ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Stoliczka, 1867 † * ''
Rissoa ovulum ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Philippi, 1844 † * ''
Rissoa pachia ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' R. B. Watson, 1886 * ''
Rissoa panhormensis ''Rissoa panhormensis'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in ...
'' Verduin, 1985 * ''
Rissoa papuana ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Tapparone Canefri, 1877 * ''
Rissoa paradoxa ''Rissoa paradoxa'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' (Monterosato, 1884) * ''
Rissoa parva ''Rissoa parva'' is a species of minute sea snail, a marine (ocean), marine gastropod mollusc or micromollusc in the family (biology), family Rissoidae. Taxonomy The status of R. interrupta in relation to R. parva is still a point of discussion ...
'' (da Costa, 1778) * ''
Rissoa patens ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' A. A. Gould, 1862 * ''
Rissoa paupera ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Thiele, 1925 * ''
Rissoa peregra ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Thiele, 1925 * ''
Rissoa perforata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Thiele, 1925 * ''
Rissoa perspecta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' E. A. Smith, 1904 * ''
Rissoa phagon ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' J. A. Gardner, 1947 † * ''
Rissoa plagiostoma ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Thiele, 1925 * ''
Rissoa plica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Can, 18444traine, 1842 * ''
Rissoa pompholyx ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Dall, 1927 * ''
Rissoa poustagnacensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Lozouet, 1998 † * ''
Rissoa pouweri ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Van Dingenen, Ceulemans & Landau, 2016 † * ''
Rissoa proditoris ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Thiele, 1925 * ''
Rissoa pseudoguerini ''Rissoa pseudoguerini'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in t ...
'' (Nordsieck & Talavera, 1979) * '' Rissoa pseudoturricula'' Strausz, 1966 † * ''
Rissoa pucilla ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' T. Brown, 1841 † * '' Rissoa punctatissima'' R. Janssen, 1978 † * ''
Rissoa punctum ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Cantraine, 1842 * ''
Rissoa quantilla ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' W. H. Turton, 1932 * ''
Rissoa quarantellii ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Brunetti & Vecchi, 2005 † * ''
Rissoa reussi ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Geinitz, 1875 † * ''
Rissoa rimata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Philippi, 1844 † * ''
Rissoa robusta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (H. C. Lea, 1845) * ''
Rissoa rodhensis ''Rissoa rodhensis'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' Verduin, 1985 * ''
Rissoa rufa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Philippi, 1849 * ''
Rissoa rufanensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' W. H. Turton, 1933 * ''
Rissoa rugosa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Svagrovský, 1971 † * ''
Rissoa rustica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' R. B. Watson, 1886 * ''
Rissoa sadoensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Yokoyama, 1926 † * ''
Rissoa sandbergeri ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' J. Müller, 1851 † * ''
Rissoa sarae ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Brunetti, Cresti & Forli, 2017 † * ''
Rissoa scurra ''Rissoa scurra'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the su ...
'' (Monterosato, 1917) * ''
Rissoa scutula ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Bell, 1892 † * ''
Rissoa searlesii ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Harmer, 1925 † * '' Rissoa seguenzorum'' Bertolaso & Palazzi, 2000 † * '' Rissoa selseyensis'' Harmer, 1925 † * '' Rissoa semicarinata'' de Folin, 1870 * ''
Rissoa semilaevis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Von Koenen, 1892 † * ''
Rissoa senecta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' S. V. Wood, 1872 † * ''
Rissoa siberutensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Thiele, 1925 * ''
Rissoa similis ''Rissoa similis'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the s ...
'' Scacchi, 1836 * ''
Rissoa sismondiana ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Issel, 1869 * ''
Rissoa sobieskii ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Friedberg, 1923 † * ''
Rissoa soceni ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Jekelius, 1944 † * ''
Rissoa solidula ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Philippi, 1849 * ''
Rissoa sordida ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' W. H. Turton, 1932 * ''
Rissoa sowerbyi ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' W. H. Turton, 1932 * ''
Rissoa spinosa ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Seguenza † * ''
Rissoa splendida ''Rissoa splendida'' is a species of minute sea snail, a marine gastropod mollusc or micromollusc in the family Rissoidae Rissoidae is a large family of very small and minute sea snails with an operculum, marine gastropod mollusks in the ...
'' Eichwald, 1830 * ''
Rissoa striatula ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Eichwald, 1830 † * '' Rissoa strombecki'' Schauroth, 1857 † * ''
Rissoa subcarinta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Cantraine, 1842 † * ''
Rissoa subclathrata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Buvignier, 1852 † * ''
Rissoa sublachesis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Zhizhchenko, 1936 † * ''
Rissoa submarginata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' d'Orbigny, 1850 † * '' Rissoa subperforata'' Jeffreys, 1884 † * ''
Rissoa sulcifera ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' G. B. Sowerby II, 1876 * ''
Rissoa sumatrana ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Thiele, 1925 * ''
Rissoa sundaica ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist o ...
'' Thiele, 1925 * ''
Rissoa suttonensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Harmer, 1925 † * ''
Rissoa tenuilineata ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' (Cossmann, 1921) † * ''
Rissoa terebellum ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Philippi, 1844 † * ''
Rissoa terebralis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Grateloup, 1838 † * ''
Rissoa teres ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' W. H. Turton, 1932 * ''
Rissoa texta ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalis ...
'' Borchert, 1901 * ''
Rissoa tirolensis ''Rissoa'' is a genus of minute sea snails, marine gastropod mollusks or micromollusks in the family Rissoidae. The genus was first introduced by M. de Freminville for some small shells observed by M. Antoine Risso, a distinguished naturalist ...
'' Koken in Wöhrmann & Koken, 1892 † * ''