Bivalvia » Parallelodon

Subclass Autobranchia Grobben, 1894
Infraclass Pteriomorphia Beurlen, 1944
Order Arcida Stoliczka, 1871
Family Parallelodontidae Dall 1898
Genus Parallelodon Meek & Worthen 1866

Parallelodon carbonarius (Cox 1857) is a bivalve with distribution from the older Pottsville Group to the younger Conemaugh Group in Ohio and Pennsylvania. Morningstar (1922) wrote that “It is characterized by surface sculpture of prominent, regular, radiating plications which become considerably larger and stronger on the flattened posterior portion below the hinge line”.

There are four good figures (Sturgeon et al., 1979, Plate 3, Fig. 4-8) to observe in the 1979 book Pennsylvanian Marine Bivalvia and Rostroconchia of Ohio. The original by Cox, Arca Carbonaria is missing the lithographed plates in the online versions.

References

• Cox, E. T., 1857. Geological Survey of Kentucky
• Hoare, R. D., 1979. Bulletin 67: Pennsylvanian Marine Bivalvia and Rostroconchia of Ohio, State of Ohio Div. of Geological Survey
• Mark, C. G., 1912. The Fossils of the Conemaugh Formation in Ohio, Geological Survey of Ohio, Fourth Series, Bul 17, pp. 261–325
• Morningstar, H., 1922. Pottsville fauna of Ohio. Ohio Geological Survey, Bulletin 25 pp. 1–312