''Ancistrobasis'' 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, and 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 ...

. Dall (1889) regarded (with some doubt) ''Ancistrobasis'' as a section of the closely related genus ''

Basilissa ''Basileus'' () is a Greek term and title that has signified various types of monarchs throughout history. In the English-speaking world, it is perhaps most widely understood to mean , referring to either a or an . The title was used by sover ...

'' ''Watson, 1879''.

Description

This genus contains the dentate forms of species formerly included in the genus ''

''.

Shell Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses Science Biology * Seashell, a hard outer layer of a marine ani ...

: The conical shell shows peripheral carina and collabral axial riblets. The midwhorl angulation and the spiral lirae are present on all

whorl 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). In nature File:Photograph and axial plane floral diagra ...

s. The posterior sinus depth is shallow. The posterior sinus has a U-shape. The anterolateral sinus is absent. The rhomboidal

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 ...

contains a basal and columellar sinus. The umbilical septum (a transverse plate secreted with early formed whorls of the shell) is absent. The shell contains pustulate microsculpture.

Radula The radula (; : radulae or radulas) is an anatomical structure used by mollusks 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 enters ...

: The rachidian tooth is broader than high with lateral wings prominent. The lateral tooth cusp is broad. The radula contains less than 10 marginal tooth pairs.

Species

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

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

'' Marshall, 1991 *''

Ancistrobasis boucheti ''Ancistrobasis'' is a genus of sea snails, marine (ocean), and marine gastropod mollusks in the family (biology), family Seguenziidae. William Healey Dall, Dall (1889) regarded (with some doubt) ''Ancistrobasis'' as a section of the closely re ...

'' Marshall, 1991 *'' Ancistrobasis caledonica'' Marshall, 1991 *'' Ancistrobasis compsa'' Melvill, 1904 *'' Ancistrobasis depressa'' ( Dall, 1889) *'' Ancistrobasis dilecta'' Marshall, 1983 *'' Ancistrobasis largoi'' Poppe, Tagaro & Dekker, 2006 *'' Ancistrobasis monodon'' ( Schepman, 1908) *'' Ancistrobasis 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) *'' Ancistrobasis scitula'' Marshall, 1991 *'' Ancistrobasis tiara'' Marshall, 1991 *'' Ancistrobasis zumbii'' Lima, Christoffersen & Barros, 2013 ;Species brought into synonymy: *''Ancistrobasis costulata'' ( Watson, 1879): synonym of '' Ancistrobasis reticulata'' (

, 1844) *''Ancistrobasis regina'' Marshall, 1983: synonym of '' Basilissopsis regina'' (Marshall, 1983)

References

* 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 {{Taxonbar, from=Q3167941 Seguenziidae Gastropod genera