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
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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

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