Rafinesquina

The figure below shows the distribution of samples containing the brachiopod Rafinesquina.

[ Rafinesquina distribution ]

Rafinesquina is a common strophomenid brachiopod in the MRV strata.

[ Rafinesquina ]

Rafinesquina Hall & Clark, 1892 [*Leptaena alternata Conrad, 1838].
Concavo-convex, unequally parvicostellate, commonly with thickened, conspicuous median costa, posterolateral rugae feeble, pseudodeltidium vestigial. Ventral muscle scar small, subcircular, weakly impressed, and without bounding ridges except for extensions of divergent dental plates; cardinalia delicate; notothyrial platform weak; trans-muscle septa not preserved.
M. Ord. - U. Ord., Northern Hemisphere
Family Strophemenidae King, 1846
Concavo-convex to resupinate, rarely geniculate or rugate; apical foramen in adult shells small or (less commonly) closed, shells exceptionally attached by cementation; chilidium well developed, pseudodeltidium usually present but exceptionally resorbed in adult shells. Teeth simple, dental plates usually present; ventral muscle scar variable in outline; notothyrial platform anchor-shaped, dorsal adductor impressions subcircular to oval, traversed by 2 pairs of variable developed ridges (trans-muscle septa); mantle canal systems poorly preserved, but probably saccate in both valves of many genera.
M. Ord. - L. Dev.
Order Strophomenida Opik, 1934

Treatise on Invertebrate Paleontology, H388.