Order Impunctate
Superfamily Orthacea
Late Ordovician -Cincinnatian Found in the Richmondian

Plaesiomys subquadratus

Mid-size brachiopod rectangular in shape. Identified by generally flat pedicle valve whereas dorsal valve is globular. Also rays on the dorsal valve tend to recurve parallel to the hinge as they approach the margin of the valve. It is often confused with Glyptorthis insculpta and Hebertella

See Plaesiomys found on field trips

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Photos courtesy of John Tate, Jack Kallmeyer and Bill Heimbrock
Descriptions courtesy of John Tate
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