Phylum: Mollusca
Class: Bivalvia
Order: Pterioida
Family: Ambonychiidae (Miller, 1877)
Cincinnatian Genera: Allonychia, Ambonychia, Anomalodonta, Anoptera

Geologic Range
Middle Ordovician – Late Devonian, ?Early Mississippian

Common Paleoecology
Ambonychiidae is an extinct order of stationary epifaunal suspension feeders

Description of the Family

  • Equivalve, generally prosogyrate.
  • Hinge teeth few, variable, or absent.
  • Internal characteristics for most constituents largely unknown due to poor preservation
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Treatise on Invertebrate Paleontology, Part N, Vol. 1 of 3 (1969):

  • Equivalve, generally prosogyre; hinge teeth few, variable, or apparently absent. Many genera have been proposed for poorly preserved and poorly prepared specimens. Internal characters of very few of the genera are adequately known. Consequently, external details of form and ornamentation have been stressed.

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