Abstract

Rare to abundant specimens of Moorites Coryell and Billings, 1932, and Discoidella Croneis and Gale, 1938, have been recovered from 13 Pennsylvanian stratigraphic units in the Appalachian basin. Eight species of Moorites, including the new species M. sturgeoni, M. ornatus. M. percultus, and M. erugatus, are recognized. Discoidella is represented by D. lingulata Cooper, 1946. Moorites hewetti Coryell and Billings. 1932, is recognized as the type species of Moorites. An ontogenetic series of M. percultus illustrates changes in shape and ornamentation. Increase in complexity of ornamentation from Lower to Upper Pennsylvanian provides a basis for specific identification.

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