Seguenziidae is a family of very small deepwater

sea snail Sea snail is a common name for slow-moving marine gastropod molluscs, usually with visible external shells, such as whelk or abalone. They share the taxonomic class Gastropoda with slugs, which are distinguished from snails primarily by the ...

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 The gastropods (), commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, from freshwater, and from land. T ...

mollusks in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).Bouchet, P. (2012). Seguenziidae. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=23116 on 2013-03-26

Distribution

Species from this family occur in the Atlantic Ocean, the Pacific Ocean, the Indian Ocean and the Antarctic Ocean, mostly at bathyal and abyssal depths. Only a few species have been found at depths less than 300 m and none at intertidal depths.Marshall, B.A. 1983: Recent and Tertiary Seguenziidae (Mollusca: Gastropoda) from the New Zealand region. New Zealand Journal of Zoology 10: 235-262
/ref>

Description

The thin, translucent, white shell has a trochiform shape. They are small or very small. Their maximum height is 22 mm. They are usually

nacreous Nacre ( , ), also known as mother of pearl, is an organicinorganic composite material produced by some molluscs as an inner shell layer; it is also the material of which pearls are composed. It is strong, resilient, and iridescent. Nacre i ...

. The inner lip has often a tooth-like fold. The outer lip has characteristically one to three concave notches (except in the genus ''

Guttula ''Guttula'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. Description (Original description by Schepman) The small, shell has a conoidal shape. It is smooth, pearly, and perforate. The aperture is rounded, with ...

''). The chitinous operculum is multispiral. The rhipidoglossan

radula The radula (, ; plural radulae or radulas) is an anatomical structure used by molluscs for feeding, sometimes compared to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food ...

has intermediate characteristics of the former order Archaeogastropoda (by having more than two pairs of marginal teeth) and the former order

Mesogastropoda Mesogastropoda was for many years a traditional taxonomic group of snails, an order. The order was composed mostly of sea snails, but it also included some land snails and freshwater snails, all of which were prosobranch gastropod mollusks. Thi ...

(by having a single pair of lateral teeth).

Taxonomy

This family consists of four following subfamilies (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005) with the following genera WoRMS : Seguenziidae; accessed : 13 September 2010
/ref> * Asthelysinae Marshall, 1991 ** ''

Anxietas ''Anxietas'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.Rosenberg, G. (2012). ''Anxietas''. Retrieved through: World Register of Marine Species The World Register of Marine Specie ...

'' Iredale, 1917 ** ''

Asthelys ''Asthelys'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. Description The conical shell lacks axial riblets and a peripheral carina but has a punctate microsculpture. The midwhorl angulation is initially absent ...

'' Quinn, 1987 ** ''

Eratasthelys ''Eratasthelys'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.WoRMS (2012). ''Eratasthelys'' Marshall, 1991. Retrieved through: World Register of Marine Species The World Register o ...

'' Marshall, 1991 ** ''

Thelyssina ''Thelyssina'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. Description The conical shell contains a peripheral carina but no axial riblets, spiral lirae or microsculpture. The U-shaped posterior sinus is shall ...

'' Marshall, 1983 * Davisianinae Egorova, 1972 - synonyms: Putillinae F. Nordsieck, 1972; Oligomeriinae Egorov, 2000 ** ''

Davisiana ''Davisiana'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.WoRMS (2012). ''Davisiana'' Egorova, 1972. Retrieved through: World Register of Marine Species The World Register of Marin ...

'' Egorova, 1972 ** ''

Oligomeria ''Oligomeria'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae.Bouchet, P. (2012). ''Oligomeria''. Retrieved through: World Register of Marine Species The World Register of Marine Spec ...

'' Galkin & Golikov, 1985 * Guttulinae Goryachev, 1987 ** ''

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 collecto ...

, 1908 ** '' Sericogyra'' Marshall, 1988 * Seguenziinae Verrill, 1884 ** tribe Fluxinellini Marshall, 1991 *** '' Ancistrobasis'' Dall, 1889 *** ''

Basilissa ''Basileus'' ( el, ) is a Greek term and title that has signified various types of monarchs in history. In the English-speaking world it is perhaps most widely understood to mean "monarch", referring to either a "king" or an "emperor" and al ...

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, 1879 *** '' Basilissopsis'' Dautzenberg & Fischer, 1897 *** ''

Calliobasis ''Calliobasis'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. The name ''Calliobasis'' was formed from the Ancient Greek words ''kallion'' (= more beautiful) and ''basis'' (= pedestal). Its gender is feminine ...

'' Marshall, 1983 *** '' Fluxinella'' Marshall, 1983 *** '' Thelyssa''

Bayer Bayer AG (, commonly pronounced ; ) is a German multinational corporation, multinational pharmaceutical and biotechnology company and one of the largest pharmaceutical companies in the world. Headquartered in Leverkusen, Bayer's areas of busi ...

, 1971 *** ''

Visayaseguenzia ''Visayaseguenzia'' is a genus of sea snails, marine gastropod molluscs in the family Seguenziidae. Species Species within the genus ''Visayaseguenzia'' include: * ''Visayaseguenzia cumingi'' Poppe, Tagaro & Dekker, 2006 * ''Visayaseguenzia ma ...

'' Poppe, Tagaro & Dekker, 2006 ** tribe Seguenziini Verrill, 1884 *** '' Carenzia'' Quinn, 1983 *** '' Hadroconus'' Quinn, 1987 *** ''

Halystes ''Halystes'' is a genus of extremely small deep water sea snails, marine gastropod mollusks in the family Seguenziidae Seguenziidae is a family of very small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioide ...

'' Marshall, 1988 *** ''

Halystina ''Halystina'' is a genus of sea snails, marine (ocean), marine gastropod mollusks in the subfamily Seguenziinae of the family (biology), family Seguenziidae. Species Species within the genus ''Halystina'' include: *''Halystina caledonica'' Mar ...

'' Marshall, 1991 *** '' Quinnia'' Marshall, 1988 *** '' Rotellenzia'' Quinn, 1987 *** ''

Seguenzia ''Seguenzia'' is a genus of sea snails, marine gastropod mollusks in the family Seguenziidae. This genus was named after Giuseppe Seguenza (1833-1889), the palaeontologist at Messina, Italy. Description The thin shell has a turbinate or sub ...

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, 1876: the type genus *** '' Seguenziopsis'' Marshall, 1983 *Unassigned : *'' Bathymargarites'' Warén & Bouchet, 1989 ;Genera brought into synonymy: * ''Fluxiella'' Okutani, 1968: synonym of '' Fluxinella'' B.A. Marshall, 1983 * ''Seguenziella'' Marshall, 1983: synonym of '' Quinnia'' Marshall, 1988

References

* Seguenza, G. 1876: ''Studii stratigrafici sulla formazione pliocenica dell'ltalia Meridionale''. Bollettino del Regio Comitato Geologico d'Italia 5 & 6: 179-189 * Goryachev, W. N. (1979): ''On the system of deep-sea molluscan family Seguenziidae.'' P. 70-71 in: Likharev, I. M. ed., Molluscs: main results of their study - abstracts of communications. U.S.S.R Academy of Sciences Zoological Institute, sixth meeting on the investigation of molluscs. Nauka * Bandel, K. (1979): ''The nacreous layer in the shells of the gastropod family Seguenziidae and its taxonomic significance''. Biomineralisation 10 : 49 - 61 * 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):725-757 * Marshall B.A. (1991).'' Mollusca Gastropoda : Seguenziidae from New Caledonia and the Loyalty Islands. In A. Crosnier & P. Bouchet (Eds) Résultats des campagnes Musorstom, vol. 7''. Mémoires du Muséum National d'Histoire Naturelle, A, 150:41-109

External links

Seashells of NSW info
{{Taxonbar, from=Q3174882 Taxa named by Addison Emery Verrill Gastropod families