- Source: Seguenziidae
Seguenziidae is a family of very small deepwater sea snails, marine gastropod mollusks in the superfamily Seguenzioidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).
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.
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. The inner lip has often a tooth-like fold. The outer lip has characteristically one to three concave notches (except in the genus Guttula). The chitinous operculum is multispiral. The rhipidoglossan radula has intermediate characteristics of the former order Archaeogastropoda (by having more than two pairs of marginal teeth) and the former order Mesogastropoda (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
Asthelysinae Marshall, 1991
Anxietas Iredale, 1917
Asthelys Quinn, 1987
Eratasthelys Marshall, 1991
Thelyssina Marshall, 1983
Davisianinae Egorova, 1972 - synonyms: Putillinae F. Nordsieck, 1972; Oligomeriinae Egorov, 2000
Davisiana Egorova, 1972
Oligomeria Galkin & Golikov, 1985
Guttulinae Goryachev, 1987
Guttula Schepman, 1908
Sericogyra Marshall, 1988
Seguenziinae Verrill, 1884
tribe Fluxinellini Marshall, 1991
Ancistrobasis Dall, 1889
Basilissa Watson, 1879
Basilissopsis Dautzenberg & Fischer, 1897
Calliobasis Marshall, 1983
Fluxinella Marshall, 1983
Thelyssa Bayer, 1971
Visayaseguenzia Poppe, Tagaro & Dekker, 2006
tribe Seguenziini Verrill, 1884
Carenzia Quinn, 1983
Hadroconus Quinn, 1987
Halystes Marshall, 1988
Halystina Marshall, 1991
Quinnia Marshall, 1988
Rotellenzia Quinn, 1987
Seguenzia Jeffreys, 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