Ancistrobasis

Ancistrobasis is a genus of sea snails, and marine gastropod mollusks in the family Seguenziidae.^[2]

Ancistrobasis
Drawing with a basal and an apertural view of a shell of Ancistrobasis depressa
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Vetigastropoda
Superfamily:	Seguenzioidea
Family:	Seguenziidae
Subfamily:	Seguenziinae
Genus:	Ancistrobasis Dall, 1889 [1]
Type species
Basilissa costulata Watson, R.B., 1879
Species
See text
Synonyms[2]
Basilissa (Ancistrobasis) Dall, 1889 (original rank)

Dall (1889) regarded (with some doubt) Ancistrobasis as a section of the closely related genus Basilissa Watson, 1879.

Description

This genus contains the dentate forms of species formerly included in the genus Basilissa.

Shell: The conical shell shows peripheral carina and collabral axial riblets. The midwhorl angulation and the spiral lirae are present on all whorls. The posterior sinus depth is shallow. The posterior sinus has a U-shape. The anterolateral sinus is absent. The rhomboidal aperture 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 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.^[3]

Species

Species within the genus Ancistrobasis include:

• Ancistrobasis adonis Marshall, 1991
• Ancistrobasis boucheti Marshall, 1991
• Ancistrobasis caledonica Marshall, 1991
• Ancistrobasis compsa Melvill, 1904
• Ancistrobasis depressa (Dall, 1889)^[4]
• Ancistrobasis dilecta Marshall, 1983
• Ancistrobasis largoi Poppe, Tagaro & Dekker, 2006^[5]
• Ancistrobasis monodon (Schepman, 1908)
• Ancistrobasis reticulata (Philippi, 1844)^[6]
• 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 (Philippi, 1844)
• Ancistrobasis regina Marshall, 1983: synonym of Basilissopsis regina (Marshall, 1983)