Rhynchonellida
Classification
Phylum: Brachiopoda
Class: Rhynchonellata
Order: Rhynchonellida (Kuhn, 1949)
Cincinnatian Families: Orthorhynchulidae, Rhynchotrematidae
Geologic Range
Early Ordovician – Recent
Common Paleoecology
Rhynchonellida is an extant order of stationary, epifaunal suspension feeders
Characteristics of the Order
- Biconvex shell
- Usually has fold on the dorsal valve and sulcus on the ventral valve
- Commonly has coarse costae
- Dental plates usually present
- Small interarea limited to the ventral valve
- Extant
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Treatise on Invertebrate Paleontology, Part H, Vol. 4 (2002):
Treatise on Invertebrate Paleontology, Part H, Vol. 4 (2002):
- Rostrate articulated brachiopods with bi-convex shell that usually has dorsal fold and ventral sulcus; interareas typically low and limited to ventral valve. Shell commonly with coarse costae, sometimes fine; mostly impunctate. Ventral interior typically with dental plates; spondylium normallly absent. Dorsal interior commonly with medium septum supporting septalium or hinge plates; outer parts of hinge plates form bases for crura that in recent genera are attached to spirolophous lophophore.
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Orthorhynchulidae
Rhynchotrematidae
