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Fossil Evidence from Fish House Clays for the Origin and Changes in Species Composition through Time of the Northern Atlantic Slope Unionid Fauna (Mollusca: Bivalvia)
Pieter W. Kat
Proceedings of the Academy of Natural Sciences of Philadelphia
Vol. 135 (1983), pp. 85-101
Published by: Academy of Natural Sciences
Stable URL: http://www.jstor.org/stable/4064797
Page Count: 17
You can always find the topics here!Topics: Fossils, Fauna, Taxa, Curvature, Marine fishes, Species, Evolution, Type specimens, Freshwater fishes, Biological taxonomies
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Pre-Wisconsinan unionid fossils within the Fish House clays near Camden, New Jersey, reveal the existence of a fauna composed of ten species. Three of these species are now found only among the Interior Basin unionid fauna, another species is now restricted to a smaller geographic range, and two anodontine species now hybridize where their newly-expanded ranges overlap. The Fish House fossils constitute the only described Pleistocene unionid fauna of the northern Atlantic Slope, and the existence of Interior Basin taxa within this fauna supports hypotheses concerning an Interior Basin origin of certain Atlantic Slope species. The Fish House fossils also indicate that the northern Atlantic Slope fauna did not result from simple processes of dispersal from an ancient center of origin in the south, that one of the northern Atlantic Slope species is relictual in distribution, and that unionids, in contrast to marine bivalves and mammals, did not suffer extinctions during the Wisconsinan glaciation, but only underwent reductions in geographic ranges.
Proceedings of the Academy of Natural Sciences of Philadelphia © 1983 Academy of Natural Sciences