Phylum: Mollusca
Class: Bivalvia
Order: Pterioida (Newell, 1965)
Cincinnatian Families: Ambonychiidae, Pterineidae

Geologic Range
Ordovician – Recent

Common Paleoecology
Pterioida is an extant order of stationary low-level epifaunal suspension feeders.

Characteristics of the Order

  • Generally inequivalve and pleurothetic
  • Heteromyarian or monomyarian
  • Ligament opisthodetic or amphidetic, and either alivincular , multivincular or duplivincular

Published Descriptions

Treatise on Invertebrate Paleontology, Part N, Vol. 1 of 3 (1969):

  • Generally inequivalve and pleurothetic; inequilateral or secondarily nearly equilateral; heteromyarian or monomyarian; ligament opisthodetic or amphidetic, alivincular, multivincular, or duplivincular, generally extended by secondary fusion layer; prismatonacreous, crossed-lamellar or foliate; pallial line not sinupalliate