Grammysiidae
Classification
Phylum: Mollusca
Class: Bivalvia
Order: Pholadomyoida
Family: Grammysiidae (Miller, 1877)
Cincinnatian Genera: Cuneamya
Geologic Range
?Early Ordovician, Middle Ordovician – Late Permian
Common Paleoecology
Grammysiidae is an extinct family of facultative mobile infaunal suspension feeders
Description of the Family
- Oval to elongate forms
- Characterized by smooth surface or concentric ornamentation
- Radial ribs with elongate ligaments
- Lunule and escutcheon commonly present
- Posterior umbonal ridge well defined in majority of the genera
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Treatise on Invertebrate Paleontology, Part N, Mollusca 6(2 of 3) (1969):
Treatise on Invertebrate Paleontology, Part N, Mollusca 6(2 of 3) (1969):
- Oval to elongate forms characterized by smooth surface or concentric ornamentation; radial ribs commonly subordinate; ligament elongate; nymphs obscure; lunule and escutcheon commonly present; posterior umbonal ridge well defined in majority of genera; pallial line entire; hinge edentulous. A poorly known, probably heterogeneous grouping of convenience.
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Cuneamya
