Biconitoma, Criscione & Hallan & Puillandre & Fedosov, 2021

Criscione, Francesco, Hallan, Anders, Puillandre, Nicolas & Fedosov, Alexander, 2021, Where the snails have no name: a molecular phylogeny of Raphitomidae (Neogastropoda: Conoidea) uncovers vast unexplored diversity in the deep seas of temperate southern and eastern Australia, Zoological Journal of the Linnean Society 191, pp. 961-1000 : 981

BICONITOMA GEN. NOV.

Z o o B a n k r e g i s t r a t i o n: u r n: l s i d: z o o b a n k. org:act: 8D2E3C5F-173F-40AB-95A1-BFBA222BEB04.

Type species: Biconitoma cretosa . OD, herein.

Etymology: The name is composed of the Latin biconus, two cones, for its biconical shell shape) and Ancient Greek τόμος, a piece, referring to the genus Raphitoma . The gender is femine.

Diagnosis

Shell ( Fig. 3D) fusiform-biconical, opaque. Teleoconch of about five whitish whorls. Spire whorls broad, with wide subsutural ramp and rounded whorl periphery. Subsutural ramp with three or four equally distanced spiral threads, whorl periphery with rounded opisthocline folds and prominent spiral cords throughout height of whorl. Siphonal canal straight, tapering. Aperture elongate,> 50% of shell length. Anal sinus wide, deeply U-shaped. Cephalic tentacles slightly tapering; eyes absent. Radula ( Fig. 6G) of tightly rolled hypodermic teeth with sharp, relatively short blade and triangular adapical opening. Tooth base broad, with weak lateral process and coarse texture. Ligament large, broad.