Nodipecten pernodosus (Heilprin, 1887)
HEILPRIN, A. 1887. Explorations of the West Coast of Florida and in the Okeechobee Wilderness. Transactions of the Wagner Free Institute of Science of Philadelphia, Vol. I [Reprinted in Palaeontographica Americana, 1964, v. 4, no. 33, p. 371-506, pls. 54-74] [p. 131, pl. 16b, figs. 69, 69a]
1887 Pecten pernodosus Heilprin, 1887
A. Heilprin, 1887, plate 16b.
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«Shell nearly equivalve, strongly plicated and ribbed, the basal margin of both valves incurved; ribs about nine, broadly elevated, and profoundly knobbed on both valves, those of the right valve almost throughout broader than the interspaces, those of the left valve of equal width, or narrower than the interspaces, and alternating in size; knobs closely placed, more or less hollow, about ten on each rib in the largest specimen; ribs and interspaces radiately ribbed or lined, the lines crossed by numerous rugose creases of growth; ears unequal, longitudinally lined or grooved, the lines declivous; cardinal pit moderately deep.
Length, four inches; height, from apex to basal margin, four inches. This beautiful scallop, which is, with little doubt, the immediate ancestor of the recent Pecten nodosus, can be readily distinguished from that species (and likewise from Pecten subnodosus, which is hardly more than a variety of P. nodosus) by the much greater prominence and regularity of its closely packed knobs, and in the circumstance that both valves are nearly equally knobbed. In Pecten nodosus the ribs of one valve, usually the right, are largely destitute of true knobs, although exhibiting here and there ephippial undulations; the knobs are also less regularly rounded, and the radiating lines are less numerous. Much the same differences separate the species from P. Peedeensis, from the Miocene of South Carolina.» ANGELO HEILPRIN, 1887
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