Ancistrobasis is a genus of sea snails, and marine gastropod mollusks in the family Seguenziidae.
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.James F. Quinn Jr., (1991), Systematic Position of Basilissopsis and Guttula, and a Discussion of the Phylogeny of the Seguenzioidea (Gastropoda: Prosobranchia), Bulletin of Marine Science, Volume 49, Numbers 1-2, September 1991, pp. 575-598(24)
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) Ancistrobasis dilecta Marshall, 1983 Ancistrobasis largoi Poppe, Tagaro & Dekker, 2006 Ancistrobasis monodon (Schepman, 1908) Ancistrobasis reticulata (Philippi, 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 (Philippi, 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