Plaesiomyidae
Classification
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Orthida
Family: Plaesiomyidae
Cincinnatian Genera: Austinella, Plaesiomys, Retrorsirostra
Geologic Range
Early Ordovician – Late Ordovician
Common Paleoecology
Plaesiomyidae is an extinct genus of stationary epifaunal suspension feeders
Description of the Family
- Costelalte orthoids with receding or subparallel dental plates
- Ventral muscle scar subquadrate to bilobate, variable enclosure by elongate diductor scars of lanceolate to oval adductor track
- Notothyrial platform supporting large cardinal process and divergent brachiophores
- Saccate ventral mantle canal system with divergent vascula media
- Dorsal system sporadically preserved
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Treatise on Invertebrate Paleontology, Part H, Vol. 3 (2000):
Treatise on Invertebrate Paleontology, Part H, Vol. 3 (2000):
- Costelalte orthoids with receding or subparallel dental plates, ventral muscle scar subquadrate to bilobate, with variable enclosure by elongate diductor scars of lanceolate to oval adductor track; notothyrial platform supporting large cardinal process and divergent brachiophores; saccate ventral mantle canal system with divergent vascula media, dorsal system sporadically preserved, variable.
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Austinella
Plaesiomys
Retrorsirostra
