Rissoidae: Pusillina (Haurakia) mediolaevis (Cotton, 1944) (‘smooth rice-shell’)
Synonym(s): mediolaevis Cotton, 1944.
Typical shell-length 2.5 mm. Lives subtidally and offshore. Native. Endemic to southeastern and southwestern Australia (TAS, VIC, SA and WA). There are as yet no confirmed records of this species in Tasmanian waters, although its presence here would not be surprising.
Subclass: Caenogastropoda – Sorbeoconcha
Order: Hypsogastropoda – Littorinimorpha