''Leptothyra'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

s, marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Colloniidae Colloniidae is a family of small sea snails with calcareous opercula, marine gastropod mollusks in the clade Vetigastropoda Vetigastropoda is a major taxonomic group of sea snails, marine gastropod mollusks that form a very ancient linea ...

. This genus was previously placed in the family

Turbinidae Turbinidae, the turban snails, are a family of small to large marine gastropod molluscs in the superfamily Trochoidea.Bouchet, P. (2014). Turbinidae Rafinesque, 1815. Accessed through: World Register of Marine Species at http://www.marinespecie ...

. The name ''Leptothyra'' is generally attributed to Pease (1869), and the name "Leptothyra Pease, 1869" is usually treated as a valid name for small colloniines. Although ''Leptothyra'' is a junior objective synonym of ''Homalopoma'', the species usually treated as valid in that genus are provisionally listed in WoRMS under "Leptothyra sensu Pease, 1869", pending a taxonomic/nomenclatural reappraisal. ''Leptothyra'' J. G. Cooper, 1867 is now considered a junior objective synonym of the genus '' Homalopoma'' Carpenter, 1864.

Description

The small, solid shell has a turbinate or globose shape. The operculum is multispiral with a subcentral nucleus and concave in the centre outside. The main character distinguishing ''

Collonia ''Collonia'' is a genus of small sea snails with calcareous operculum (gastropod), opercula, marine (ocean), marine gastropod mollusks in the family (biology), family Colloniidae.WoRMS (2012). ''Collonia'' Gray, 1850. Accessed through: World Reg ...

'' from ''Leptothyra'' seems to be the peculiar

peristome Peristome (from the Greek language, 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 mo ...

of the former.

Species

Species within the genus ''Leptothyra'' include: * ''

Leptothyra balnearii ''Leptothyra'' is a genus of sea snails, marine gastropod mollusks in the family Colloniidae. This genus was previously placed in the family Turbinidae. The name ''Leptothyra'' is generally attributed to Pease (1869), and the name "Leptothyra ...

'' Pilsbry, H.A., 1920 * '' Leptothyra benthicola'' (Marshall, 1979) * '' Leptothyra candida'' Pease, 1861 * '' Leptothyra filifer'' (Deshayes, 1863) * '' Leptothyra grossa'' Feng, 1996 * '' Leptothyra kermadecensis'' (Marshall, 1979) * '' Leptothyra morini'' Viader, R., 1951 * ''

Leptothyra nanina ''Leptothyra nanina'' is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae.Bouchet, P. (2012). ''Leptothyra nanina'' (Souverbie in Souverbie & Montrouzier, 1864). Accessed through: Worl ...

'' (Souverbie in Souverbie & Montrouzier, 1864) * '' Leptothyra rubens'' Melvill & Standen, 1903 ;Species brought into synonymy: * ''Leptothyra africana'' Bartsch, 1915: synonym of '' Cinysca spuria'' (Gould, 1861) * ''Leptothyra agulhasensis'' Thiele, 1925: synonym of '' Homalopoma agulhasense'' (Thiele, 1925) * ''Leptothyra albida'' Dall, 1881: synonym of '' Homalopoma albidum'' (Dall, 1881) * ''Leptothyra albocincta'' Turton, 1932: synonym of '' Tricolia striolata'' (Turton, 1932) * ''Leptothyra alfredensis'' Bartsch, 1915: synonym of ''

Parviturbo alfredensis ''Parviturbo'' is a genus of minute sea snails, marine gastropod mollusks in the family Skeneidae. Description The very small, solid shell is perforate or has a narrow umbilicus. It contains a few convex whorls. The protoconch consists of one ...

'' (Bartsch, 1915) * ''Leptothyra arenacea'' Pritchard & Gatliff, 1902: synonym of '' Charisma arenacea'' (Pritchard & Gatliff, 1902) * ''Leptothyra carminea'' Bartsch, 1915: synonym of ''Homalopoma quantillum carmineum'' (Bartsch, 1915) * ''Leptothyra coelata'' A. Adams, 1854: synonym of '' Anadema macandrewii'' Mörch, 1868 * ''Leptothyra costata'' Pease, 1869: synonym of ''Leptothyra verruca'' (Gould, 1845) * ''Leptothyra crassilirata'' Preston, 1909: synonym of '' Collonista crassilirata'' (Preston, 1909) * ''Leptothyra cunninghami'' E. A. Smith, 1881: synonym of ''

Homalopoma cunninghami ''Homalopoma cunninghami'' is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae.Rosenberg, G. (2012). ''Homalopoma cunninghami'' (E. A. Smith, 1881). Accessed through: World Register of ...

'' (E. A. Smith, 1881) * ''Leptothyra delecta'' E. A. Smith, 1899: synonym of '' Collonista delecta'' (E. A. Smith, 1899) * ''Leptothyra eroopolitana'' (Issel, 1869) : synonym of '' Collonista eroopolitana'' (Issel, 1869) * ''Leptothyra eucosmia'' Turton, 1932: synonym of '' Cinysca spuria'' (Gould, 1861) * ''Leptothyra fluctuata'' (Hutton, 1883): synonym of '' Argalista fluctuata'' (Hutton, 1883) * ''Leptothyra folini'' Pilsbry, 1889: synonym of ''

Collonista purpurata ''Collonista'' is a genus of sea snails in the family Colloniidae. Species , the World Register of Marine Species accepts 20 species within the genus ''Collonista'': * '' Collonista amakusaensis'' * '' Collonista arsinoensis'' * '' Collonista ...

'' (Deshayes, 1863) * ''Leptothyra gestroi'' Caramagna, 1888: synonym of '' Yaronia gestroi'' (Caramagna, 1888) * ''Leptothyra globuloides'' Dautzenberg & H. Fischer, 1896: synonym of '' Cantrainea globuloides'' (Dautzenberg & H. Fischer, 1896) * ''Leptothyra induta'' Watson, 1879: synonym of ''

Homalopoma indutum ''Homalopoma indutum'', common name the two-faced dwarf turban, is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae.Rosenberg, G. (2012). ''Homalopoma indutum'' (Watson, 1879). Accessed ...

'' (Watson, 1879) * ''Leptothyra induta'' var. ''tincta'' Dall, 1889: synonym of ''

'' (Watson, 1879) * ''Leptothyra induta'' var. ''insculpta'' Dall, 1889: synonym of ''

'' (Watson, 1879) * ''Leptothyra inepta'' (Gould, A.A., 1861): synonym of ''Neocollonia pilula'' (Dunker, 1860): synonym of '' Bothropoma pilula'' (Dunker, 1860) * ''Leptothyra innocens'' Thiele, 1912: synonym of '' Leptocollonia innocens'' (Thiele, 1912) * ''Leptothyra insculpta'' Dall, 1889: synonym of ''

'' (Watson, 1879) * ''Leptothyra laeta'' (Montrouzier in Souverbie & Montrouzier, 1863): synonym of ''

Collonia granulosa ''Artiscollonia granulosa'' is a species of small sea snail with calcareous opercula, a marine gastropod mollusk in the family Colloniidae.Herbert D.G. (1996) A critical review of the trochoidean types in the Muséumd'Histoire naturelle, Bordea ...

'' Pease, 1868 * ''Leptothyra limata'' Dall, 1889: synonym of '' Homalopoma linnei'' (Dall, 1889) * ''Leptothyra linnei'' Dall, 1889: synonym of '' Homalopoma linnei'' (Dall, 1889) * ''Leptothyra paucicostata'' Dall, 1871: synonym of '' Homalopoma paucicostatum'' (Dall, 1871) * ''Leptothyra philipiana'' Dall, 1889: synonym of '' Cantrainea philipiana'' (Dall, 1889) * ''Leptothyra picta'' Marshall, 1979: synonym of '' Leptothyra kermadecensis'' Marshall, 1979 * ''Leptothyra quantilla'' (Gould, 1861): synonym of '' Homalopoma quantillum'' (Gould, 1861) * ''Leptothyra rotundata'' (G.B. Sowerby III, 1892): synonym of '' Homalopoma rotundatum'' (G.B. Sowerby III, 1892) * ''Leptothyra rubricincta'' (Mighels, 1845): synonym of ''

Collonista rubricincta ''Collonista rubricincta'' is a species of small sea snail with calcareous opercula, a marine gastropod mollusc in the family Colloniidae.MolluscaBase eds. (2021). MolluscaBase. Collonista rubricincta (Mighels, 1845). Accessed through: World Re ...

'' (Mighels, 1845) * ''Leptothyra sakaensis'' Yokoyama, 1925: synonym of ''

Littorina brevicula ''Littorina brevicula'' is a species of sea snail, a marine gastropod mollusk in the family Littorinidae The Littorinidae are a taxonomic family of over 200 species of sea snails, marine gastropod molluscs in the clade Littorinimorpha, com ...

'' (Philippi, 1844) * ''Leptothyra sanguinea'' Linnaeus, 1758: synonym of ''

Homalopoma sanguineum ''Homalopoma'', common name the dwarf turbans, is a genus of mostly very small sea snails with a calcareous operculum, marine gastropoda molluscs in the subfamily Colloniinae of the family Colloniidae.Gofas, S.; Bouchet, P. (2011). Homalopoma ...

'' (Linnaeus, 1758) * ''Leptothyra solida'' Preston, 1908: synonym of ''

Collonista solida ''Collonista'' is a genus of sea snails in the family Colloniidae. Species , the World Register of Marine Species accepts 20 species within the genus ''Collonista'': * '' Collonista amakusaensis'' * '' Collonista arsinoensis'' * '' Collonista ...

'' (Preston, 1908) * ''Leptothyra tincta'' Dall, 1889: synonym of ''

'' (Watson, 1879) * ''Leptothyra verruca'' (Gould, 1845): synonym of ''

Collonista verruca ''Collonista verruca'' is a species of sea snail, a marine gastropod mollusc in the family Colloniidae.MolluscaBase eds. (2021). MolluscaBase. Collonista verruca (Gould, 1845). Accessed through: World Register of Marine Species at: https://www.m ...

'' (Gould, 1845)

Description

Species

References

Further reading