(d'Orbigny, 1836)
Diagnosis: Spire depressed, broader than high, body whorl increasing very rapidly in diameter. Up to 4.5 colorless whorls. Umbilicus narrow but deep, spiral striation around umbilicus, rest of shell smooth. Inner border of aperture straight, suture very well marked. Wing protrusions absent. Embryonic shell with rough granulated surface (Boltovskoy, 1974b). Shell height 0.8 mm, diameter 13 mm.