Middle Ordovician – Late Devonian, ?Early Mississippian
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
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.