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CMNH 5780, Strophomena planumbona (Hall, 1847)
Age: Late Ordovician (Richmondian) Rock unit: Liberty Formation
Locality: Oxford, Butler Co., OH
Collector and donor: Gary Meszaros Date collected: 1982 or earlier
Slab length: 17.6 cm.
Brachiopods are extant marine shell-bearing organisms with two concave shell halves that clamp together. They form a brachial and pedicle valve, the latter being attached to a stalk or pedicle which ties the organism to the seafloor. The head of the brachiopod suspends itself above the seafloor, filter feeding any food which may float near it. Brachiopods are divided into two large classes based on the strutures which hold the two valves together. Inarticulata valves are mainly held together by various muscles, while Articulata use a hinging system of teeth and sockets (Barbara Schwimmer and Michael Sandy 1996, “Phylum Brachiopoda”).