Platystrophia ponderosa
Articulate
Order Impunctate
Superfamily Orthacea
Late Ordovician -Cincinnatian
Found in McMillan/Grant LakeA large brachiopod, globular in shape, with bold costa on the valves. There are three costa in the pedicle sulcus and three costa on the brachial fold. There are two subspecies. Platystrophia ponderosa ponderosa is the more common with an interarea as long as or nearly as long as the shell width. Platystrophia ponderosa auburnensis has a much shorter interarea no longer than the width of the dorsal valve fold. Platystrophia ponderosa auburnensis is confined to the Mt. Auburn.
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Photos courtesy of John Tate, Jack Kallmeyer and Bill
Heimbrock
Descriptions courtesy of John Tate
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