Parallelodon sp.

side view

bottom view

General abundance:  Common

Parallelodon
A bivalve that survived from the early Ordovician
to the Late Jurassic, Parallelodon had a world wide
distribution. Its shell shows concentric growth
lines and usually had radial ribs. Its name means
"parallel teeth" and refers to the long side at the
end of the hinge. The teeth are not for feeding, but
are used to hold the two valves together.

Reference:
Fossils of Ohio, Bulletin 70,
Ohio Division of Geological Survey, 1996.
Pages 140 & 148-149 (fig. 19)

Class Bivalvia
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Pennsylvanian Fossils of Missouri