Powellisetia Powellisetia ponderi Powellisetia unicarinata Powellisetia bilirata Powellisetia paroeca Powellisetia deserta Powellisetia pelseneeri Powellisetia comes Notosetia Subonoba Rissoa Rissoidae Winston Ponder List of marine gastropod genera in the fossil record 2018 in paleomalacology