NEOGASTROPODA WENZ, 1938

Kantor, Yu. I., Fedosov, A. E., Puillandre, N., Bonillo, C. & Bouchet, P., 2017, Returning to the roots: morphology, molecular phylogeny and classification of the Olivoidea (Gastropoda: Neogastropoda), Zoological Journal of the Linnean Society 180, pp. 493-541 : 525

ORDER NEOGASTROPODA WENZ, 1938

SUPERFAMILY OLIVOIDEA LATREILLE, 1825

Diagnosis: Shell variable, from broadly oval to narrowly fusiform, with high last whorl and diameter of the spire whorls expanding slowly or rapidly. Siphonal canal either absent (in which case the shell is strongly notched) or very short, unnotched. Shell sometimes covered with thick periostracum, but in most cases not and then shell surface glossy. Protoconch multispiral or paucispiral. In all families except Pseudolividae and Benthobiidae , anterior end of the shell strongly callused and bearing an anterior band. Callus differently pronounced, sometimes limited to inner apertural lip, but at other times extending on significant part of the last whorl and spire, or even completely covering the shell (some Ancillidae). Radula with five to three teeth per transverse row.