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Science 21 July 1972:
Vol. 177. no. 4045, pp. 264 - 267
DOI: 10.1126/science.177.4045.264
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Articles

Rostroconchia: A New Class of Bivalved Mollusks

John Pojeta Jr. 1, Bruce Runnegar 2, Noel J. Morris 3, and Norman D. Newell 4

1 U.S. Geological Survey, Washington, D.C. 20242
2 University of New England, Armidale, New South Wales, Australia
3 British Museum (Natural History), London, England
4 American Museum of Natural History, New York 10024

Four Paleozoic bivalved genera are assigned to the new molluscan class Rostroconchia: Eopteria, Euchasma, Conocardium, and Pseudoconocardium. These mollusks have ani uncoiled univalved larval shell; an untorted bivalved adult shell; no hinge teeth, ligament, or adductor muscles; and a fused, almost inflexible. hinge. Rostroconchianis developed separately from the pelecypods through the ribeirioids, but are regarded as more closely related to the Pelecypoda and Scaphopoda than to other known classes of mollusks.


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