Neoancistrocrania Sous-embranchement (subphylum) des Craniiformea Classe des Craniata Ordre des Craniida Super-famille des Cranioidea Famille des Craniidae

Genus Neoancistrocrania  Laurin, 1992

[Type species= Neoancistrocrania norfolki Laurin, 1992]

Biconical, inequivalved, ventral apex flattened as attachment cicatrix; dorsal beak posterocentral, smooth with faint growth laminae; ventral posterior muscle scars large, marginal, separated by a stout rounded swelling; dorsal interior with pair of rounded knobs alongside posterior adductors, bearing oblique muscles, extending up into ventral valve; otherwise resembling Ancistrocrania but with reduced septum between processes; marginal rim not thickened.

Present Diagnosis from Laurin (1992) and volume 2 of the Treatise on Invertebrate Paleontology

Extant Species of Neoancistrocrania

N. norfolki Laurin, 1992

Diagnosis

FIGURES : Neoancistrocrania      Geographic distribution      Photographies

Neoancistrocrania norfolki  Laurin, 1992 - type species Type locality: Norfolk Ridge (France) - CHALCAL II Cruise: st. DW 78, 23°41'3S, 167°59'6E, 233 m. Depth range: 100 to 619 m. Original Diagnosis Laurin (1992) Craniidae characterized by the great development of the ventral valve and by the occurrence of a reduced median septum and shelly processes in the dorsal valve. The anterior adductor muscles and brachial elevator muscles are inserted on these processes

Neoancistrocrania norfolki (height ca. 2 cm) dredged from a seamount on the Norfolk Ridge, 2001 (New Caledonia, France). © B. L. Cohen.