''Seguenzia'' 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 ...

Seguenziidae Seguenziidae is a family (biology), family of very small deepwater sea snails, marine (ocean), marine gastropod mollusks in the superfamily Seguenzioidea (according to the Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005), taxonomy of the Gastr ...

. This genus was named after

Giuseppe Seguenza Giuseppe Seguenza (June 8, 1833 in Messina – February 3, 1889 in Messina) was an Italian naturalist and geologist. Early life Giuseppe Seguenza was born on June 8, 1833, in Italy. Because his father expected him to follow in his footsteps an ...

(1833–1889), the palaeontologist at Messina, Italy.

Description

The thin shell has a turbinate or subtrochoid shape. It is translucent, the outer layer very slight, somewhat nacreous in fresh specimens. There is no epidermis. The shell contains spiral carinations. The upper part of the body whorl is deeply and widely grooved. The

aperture In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image o ...

is irregular and sinuous behind. The

columella Lucius Junius Moderatus Columella (, Arabic: ) was a prominent Roman writer on agriculture in the Roman Empire. His in twelve volumes has been completely preserved and forms an important source on Roman agriculture and ancient Roman cuisin ...

is twisted and abruptly notched below. It has a small tooth-like process. The base of the shell shows a sinus. It is deeply umbilicated or imperforate. The thin operculum is oval, with a subcentral nucleus and with obsolete, numerous concentric lines.

Species

According to the

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive catalogue and list of names of marine organisms. Content The content of the registry is edited and maintained by scien ...

(WoRMS), the following species with valid name are included within the genus ''Seguenzia'' : *''

Seguenzia antarctica ''Seguenzia antarctica'' is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae. Description The height of the shell attains . Distribution This species occurs in the Weddell Sea, Antarctica. References * Engl W. ( ...

'' Thiele, 1925 *''

Seguenzia balicasagensis ''Seguenzia balicasagensis'' is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae. Description The height of the shell attains 2.5 mm. Distribution This marine species occurs off the Philippines The Ph ...

'' Poppe, Tagaro & Dekker, 2006 *''

Seguenzia beloni ''Seguenzia beloni'' is a species of sea snail, a marine gastropod mollusk in the family (biology), family Seguenziidae. Specimens were discovered in a trawl at 400 meters depth then named after Pierre Belon (1517–1564), a French naturalist. ...

'' Poppe, Tagaro & Dekker, 2006 *''

Seguenzia cervola ''Seguenzia cervola'' is a species of extremely small deep-water sea snail, a marine gastropod mollusk in the family Seguenziidae.Rosenberg, G. (2013). ''Seguenzia cervola'' Dall, 1919. Retrieved through: World Register of Marine Species at htt ...

'' Dall, 1919 *''

Seguenzia chariessa ''Seguenzia chariessa'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.WoRMS (2013). ''Seguenzia chariessa'' Marshall, 1991. Retrieved through: World Register of Marine Species at htt ...

'' Marshall, 1991 *'' Seguenzia chelina'' Marshall, 1983 *'' Seguenzia compta'' Marshall, 1983 *'' Seguenzia conopia'' Marshall, 1983 *''

Seguenzia costulifera ''Seguenzia costulifera'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.WoRMS (2013). ''Seguenzia costulifera''. Retrieved through: World Register of Marine Species at http://www.mar ...

Schepman Mattheus Marinus Schepman (17 August 1847 – 19 November 1919) was a Dutch malacologist. He was one of the foremost collectors of mollusc shells in the Netherlands, and was also high on the overall list of European collectors. Dutch collectors ...

, 1909 *''

Seguenzia dabfari ''Seguenzia dabfari'' is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae. Description The size of the shell varies between 2 mm and 3 mm. Distribution This marine species occurs off the Philippines ...

'' Poppe, Tagaro & Dekker, 2006 *''

Seguenzia dautzenbergi ''Seguenzia dautzenbergi'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.WoRMS (2013). ''Seguenzia dautzenbergi'' Schepman, 1909. Retrieved through: World Register of Marine Species ...

, 1909 * † '' Seguenzia donaldi'' Ladd, 1982 *''

Seguenzia eidalima ''Seguenzia eidalima'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.Marshall, B. (2013). ''Seguenzia eidalima'' B.A. Marshall, 1991. Retrieved through: World Register of Marine Spec ...

'' Marshall, 1991 *''

Seguenzia elegans ''Seguenzia elegans'' is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae. Description The size of the shell varies between 3 mm and 4.3 mm. The base is perforated or umbilicated. The fissure of the outer ...

Jeffreys Jeffreys is a surname that may refer to the following notable people: * Alec Jeffreys (born 1950), British biologist and discoverer of DNA fingerprinting * Anne Jeffreys (1923–2017), American actress and singer * Arthur Frederick Jeffreys ( ...

, 1885 *''

Seguenzia elegantissima ''Seguenzia elegantissima'' is a species of sea snail, a marine gastropod mollusk in the family Seguenziidae. Description The size of the shell varies between 2 mm and 3 mm. Distribution This marine species occurs off the Philippine ...

'' Poppe, Tagaro & Dekker, 2006 *''

Seguenzia emmeles ''Seguenzia emmeles'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.Marshall, B. (2013). ''Seguenzia emmeles'' B.A. Marshall, 1991. Retrieved through: World Register of Marine Specie ...

'' Marshall, 1991 *'' Seguenzia engonia'' B.A. Marshall, 1991 *'' Seguenzia eritima'' Verrill, 1884 *'' Seguenzia eutyches'' Marshall, 1991 *'' Seguenzia fatigans'' Barnard, 1963 *'' Seguenzia floridana'' Dall, 1927 *'' Seguenzia formosa''

, 1876 *'' Seguenzia fulgida'' Marshall, 1983 *''

Seguenzia giovia ''Seguenzia giovia'' is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.Rosenberg, G. (2013). ''Seguenzia giovia'' Dall, 1919. Retrieved through: World Register of Marine Species at http: ...

'' Dall, 1919 * † '' Seguenzia glabella'' B. A. Marshall, 1983 *'' Seguenzia hapala'' Woodring, 1928 *'' Seguenzia hosyu'' Habe, 1953 *'' Seguenzia iota'' Marshall, 1991 *'' Seguenzia keikoae'' Poppe, Tagaro & Dekker, 2006 *'' Seguenzia levii'' Marshall, 1991 *'' Seguenzia lineata'' Watson, 1879 *'' Seguenzia louiseae'' A.H. Clarke, 1961 * '' Seguenzia macleani'' Geiger, 2017 *'' Seguenzia matara'' Marshall, 1988 *'' Seguenzia metivieri'' Marshall, 1991 *'' Seguenzia mirabilis'' Okutani, 1964 *'' Seguenzia monocingulata'' Seguenza, 1876 *'' Seguenzia nipponica'' Okutani, 1964 *'' Seguenzia nitida'' Verrill, 1884 *'' Seguenzia occidentalis'' Dall, 1908 *'' Seguenzia orientalis'' Thiele, 1925 *'' Seguenzia platamodes'' Marshall, 1991 *'' Seguenzia praeceps'' Marshall, 1991 * † '' Seguenzia prisca'' B. A. Marshall, 1983 * † '' Seguenzia propheta'' Lozouet, 1999 *'' Seguenzia richeri'' Marshall, 1991 * † '' Seguenzia serrata'' B. A. Marshall, 1983 *'' Seguenzia soyoae'' (Okutani, 1964) * † '' Seguenzia statiana'' Sosso, Bertolaso & Dell'Angelo, 2020 *'' Seguenzia stegastris'' Marshall, 1991 *'' Seguenzia stephanica'' Dall, 1908 *'' Seguenzia sumatrensis'' Thiele, 1925 *'' Seguenzia textilis'' Marshall, 1983 *'' Seguenzia transenna'' Marshall, 1983 *'' Seguenzia triteia'' Salvador, Cavallari & Simone, 2014 *'' Seguenzia trochiformis'' Poppe, Tagaro & Dekker, 2006 *'' Seguenzia wareni'' Marshall, 1991 ;Species brought into synonymy: *''Seguenzia caliana'' Dall, 1919: synonym of '' Seguenzia stephanica'' Dall, 1908 *''Seguenzia carinata''

, 1876 synonym of '' Carenzia carinata'' (Jeffreys, 1877) *''Seguenzia certoma'' Dall, 1919: synonym of '' Seguenzia stephanica'' Dall, 1908 *''Seguenzia cazioti'' Dautzenberg, 1925: synonym of '' Quinnia cazioti'' (Dautzenberg, 1925) *''Seguenzia ionica'' Watson, 1878 synonym of Quinnia ionica (Watson, 1878) *''Seguenzia laxa''

, 1885: synonym of '' Haloceras laxa'' (Jeffreys, 1885) *''Seguenzia megaloconcha'' Rokop, 1972: synonym of ''

'' Dall, 1919 *''Seguenzia melvillii''

, 1909: synonym of '' Carenzia melvillii'' (

, 1909) *''Seguenzia polita'' Verco, 1906: synonym of '' Quinnia polita'' ( Verco, 1906) * ''Seguenzia quinni'' J. H. McLean, 1985: synonym of ''

'' Dall, 1919 *''Seguenzia reticulata'' (

Philippi Philippi (; , ''Phílippoi'') was a major Greek city northwest of the nearby island, Thasos. Its original name was Crenides (, ''Krēnĩdes'' "Fountains") after its establishment by Thasian colonists in 360/359 BC. The city was renamed by Phili ...

, 1844): synonym of '' Ancistrobasis reticulata'' (

, 1844) *''Seguenzia rushi'' Dall, 1927: synonym of '' Quinnia rushi'' (, 1927) *''Seguenzia siberutensis'' Thiele, 1925: synonym of '' Halystina siberutensis'' ( Thiele, 1925) *''Seguenzia simplex'' Barnard, 1963: synonym of '' Halystina simplex'' (Barnard, 1963) *''Seguenzia sykesi''

, 1909: synonym of '' Quinnia sykesi'' (

, 1909) *''Seguenzia tricarinata''

, 1885: synonym of '' Haloceras tricarinata'' (

, 1885)

References

* Quinn J.F. (1983). ''A revision of the Seguenziacea Verrill, 1884 (Gastropoda : Prosobranchia). I. Summary and evaluation of the superfamily'', Proceedings of the Biological Society of Washington, 96(4): pp. 725–757

External links

Jeffreys, J. G. (1876). Preliminary report of the biological results of a cruise in H.M.S. Valorous to Davis Straits in 1875. Proceedings of the Royal Society of London. 25: 177-237.

Marshall, B. A. (1983). Recent and Tertiary Seguenziidae (Mollusca: Gastropoda) from the New Zealand region. New Zealand Journal of Zoology. 10: 235-262.

Harris, G. F. (1897). Catalogue of Tertiary Mollusca in the Department of Geology, British Museum (Natural History). Part I. The Australasian Tertiary Mollusca. London: British Museum (Natural History). xxvi + 406 pp., 6 pls.
{{Taxonbar, from=Q3171150 Seguenziidae Taxa named by John Gwyn Jeffreys