Pecten humphreysii woolmani Heilprin, 1888
HEILPRIN, A. 1888. The Miocene Mollusca of the State of New Jersey. Transactions of the Wagner Free Institute of Science of Philadelphia, 1887, part III: 397-405 [p. 405]
1888 Pecten humphreysii var. woolmani Heilprin, 1888
«Under this name I propose to designate a Pecten, which appears to be only a variety or sub-species of the Maryland P. Humphreysii, difiering from the normal type of that species in the greater elevation of the ears, and the more distinct quadrangulation of the ribs of the convex valve. The ribs are also more prominently lined. All the New Jersey specimens that I have seen of what appears to be Pecten Humphreysii agree in these characters.
Illustrations of these species will be given in a future paper.» ANGELO HEILPRIN, 1888
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«Discussion.— The material from New Jersey available to Whitfield (1894) and Richards and Harbison (1942) was mainly fragmentary, as is the present material from the Pollack Farm Site. Those authors concluded that their material agreed well with Conrad’s (1842) description and figure. They admitted, however, that their specimens had very square ribs as described by Heilprin (1888). Gibson (1987) figured a number of specimens of P. humphreysii humphreysii, P. humphreysii woolmani, and P. mclellani, and it appears to this author that they may all be variants of the same species. It seems safe at this time to treat the Delaware material as a distinct subspecies; however, because of the fragmentary material this distinction is uncertain. Apparently the forms with the very squared ribs occur only in the lower Calvert (Bed 3A), the Shiloh Marl of the Kirkwood, and the Pungo River Formation, all stratigraphically equivalent units.
Geologic range.— Kirkwood Formation; Calvert Formation, Fairhaven Member (Bed 3A); Pungo River Formation.» WARD, L. W. 1998. Mollusks from the Lower Miocene Pollack farm site, Kent County, Delawere: a preliminary analysis. In: R. N. Benson, ed., 1998, Geology and paleontology of the lower Miocene Pollack Farm Fossil Site, Delaware: Delaware Geological Survey Special Publication No. 21, p. 59–131. [79, 80]
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Pecten humphreysii woolmani Heilprin; L. W. Ward, 1998, Mollusks from the Lower Miocene Pollack farm site, plate 10, figures 3, 4.
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