Argopecten anteamplicostatus (Mansfield, 1936)
MANSFIELD, W. C. 1936. Stratigraphic significance of Miocene, Pliocene and Pleistocene Pectinidae in the Southeastern United States. Journal of Paleontology, 10 (3): 168-192. [p. 189, pl. 23, figs. 5-7]
1936 Pecten (Chlamys) gibbus anteamplicostatus Mansfield, 1936
W. C. Mansfield, 1936, plate 23.
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«Pecten gibbus amplicostattts DALL (part), 18'98, Wagner Free Inst. Sci., Trans.,. vol. 3, pt. 4, p. 747.
The holotype of P. gibbus amplicostatus Dall, a Recent specimen from Texas (U. S. Nat. Mus. 106990), is figured in the Proceedings of the United States National Museum, vol. 24, pl. 32, fig, 9, 1902. Dall's type specimen, as well as other Recent specimens referred to his subspecies, have radially striated submargins. The specimens from the Pliocene Caloosahatchee marl that Dall included under his subspecies have smooth submargins and are here treated as a new subspecies. The Pliocene form also has wider submargins and 3 to 4 more ribs. In other features it is similar to the Recent form. Dimensions of syntypes (U. S. Nat. Mus. 373078): Right valve, length, 39 mm.; height, 37 mm.; convexity, 19 mm. Left valve, length, 39 mm.; height, 37 mm.; convexity, 19 mm. Type locality: Caloosahatchee River (exact place on the river not known), Florida. Horizon: Pliocene Caloosahatchee marl. Known occurrences: Station 1/1170, one mile below highway bridge at Labelle, Hendry County, C. W. Cooke, Stuart Mossom, and W. C. Mansfield collectors; Station 3300, Shell Creek, Charlotte County; both in Florida.» WENDELL CLAY MANSFIELD, 1936
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«Comparison. A. anteamplicostatus differs from A. compariIis in being more right-convex and in having more rounded and generally less numerous plicae fringed by more widely spaced concentric lamellae. The species differs from A. irradians in having noncostate rather than distinctly costate disk flanks and more angular plicae.
Stratigraphic range. Upper Miocene (Pinecrest Beds) and Pliocene (Caloosahatchee Marl and possibly the Waccamaw Formation). Geographic distribution and ecology. A. anteamplicostaus is found in the Pinecrest Beds at Acline, Charlotte County, Florida, and ocurrrs throughout the range of exposure of the Caloosahatchee Marl, from Saint Petersburg southeastward to the Caloosahatchee River in southwestern Florida. A single, fragmented valve (pl. 5, figs. 15, 16) identified with A. anteamplicostatus was found associated with hundreds of specimens of A. vicenarius vicenarius in the Waccamaw Formation at Old Dock, Columbus County, North Carolina. On this basis the species presumably extended into the Carolinas but did not, or generally could not, live in the environments represented by the Waccamaw Formation (see discussion of ecology under A. vicenarius vicenarius). A. anteamplicostatus is interpreted, on morphological grounds, to be a primitive bay scallop with ecological requirements similar to those of living A. irradians.» WALLER, T. R. 1969. The Evolution of Argopecten gibbus Stock (Mollusca: Bivalvia), with Emphasis on the Tertiary and Quaternary Species of Eastern North America. The Paleontological Society Memoir, 3 [Journal of Paleontology, 43 (5, supplement)]: 125 pp. [p. 51]
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Argopecten anteamplicostatus (Mansfield ); T. R. Waller, 1969, The Evolution of Argopecten gibbus Stock, plate 5, figures 15, 16; plate 6, figures 1-4.
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