Powellisetia paroeca is an extinct species of marine gastropod mollusc in the family Rissoidae.[1] First described by Harold John Finlay in 1924, it is known to have lived in New Zealand during the early Miocene.
The species was identified in 1924 by Harold John Finlay as a subspecies of Powellisetia prisca, and later described as a species in its own right.
Finlay described both Powellisetia paroeca and Powellisetia prisca as follows:
Finlay noted some differences between the two groups, namely that Powellisetia paroeca "...differs from the species only in slightly higher spire and more regularly curved outer lip, which slants downwards from suture without any medial angulation."
Fossils of the species have only been identified in New Zealand.[1] The holotype was collected from sandstone at Calamity Point in Clifden, Southland, which dates to the early Miocene era.[2]