Powellisetia is a genus of minute sea snails, marine gastropod mollusks micromollusks in the family Rissoidae. The genus is primarily found in the Southern Hemisphere.
Description
In the original description, Ponder described Powellisetia as follows: Members of Powellisetia have a thin, horny operculum, which is transparent and ranges from ovate to ear-shaped, typically with two whorla and a wide nucleus. ==Taxonomy==
Taxonomy
The genus was first described by Winston Ponder in 1965, who named the genus after malacologist A. W. B. Powell, and named Rissoa porcellana (current accepted name Powellisetia porcellana) as the type species. ==Distribution==
Distribution
Most members of Powellisetia are found in the waters of New Zealand, Australia, Antarctica and sub-Antarctic regions of the world. Fossils of the species date to the Miocene. ==Species==