Subfamily Platylepadinae Newman & Ross, 1976

Diagnosis (emended after Ross & Frick 2011: 62)

Wall peltate or low-conical; mono- or bi-lamellar; parietes with a large internal midrib either with or without a corresponding external medial sulcus; midrib either smooth or having several alternating ridges incorporated into basal surface; external longitudinal sulci, when present, formed by T-shaped flanges; sutural elaborations absent; orifice worn by corrosion or abrasion, or dehiscent.

Included genus

Platylepas Gray, 1825 .