Argopecten demiurgus (Dall, 1898)
DALL, W. H. 1898. Contributions to the Tertiary fauna of Florida. Silex Beds of Tampa and the Pliocene Beds of the Caloosahatchie River. Part IV. I. Prionodesmacea: Nucula to Julia. 2. Teleodesmacea: Teredo to Ervilia. Transactions of the Wagner Free Institute of Science of Philadelphia, 3 (4): viii, 571-947 p., pls. 23-35 (pls. 36 and 37 in part 5, 1900) [p. 718, pl. 26, fig. 3]
W. H. Dall, 1898, plate 26.
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«From the Caroni Series of Trinidad at Savanetta; Guppy.
This species, which is closely related to the Pacific coast P. ventricosus Sowerby, differs by its rounded and minutely squamose ribs, narrower umbones, wider and less inflated shell, with the anterior ears more deeply inset. It has twenty ribs, smooth submargins, and a rather deep notch. Alt. 70, lat. 72, max. diam. 36 mm. The left valve is a little less inflated than the other. Pecten rudis Gabb, as of Sowerby, from the Tertiary of Costa Rica, appears to be indeterminable». WILLIAM HEALEY DALL, 1898
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«Holotype. — USNM 115527.
Type locality. — Savanetta, Trinidad (Dall) . This locality is near Philippine Estate, west of Gran Couva, Trinidad. This species is abundant at the base of the Melajo Clay. The specimens agree with topotypes of A. demiurgus. Rutsch is probably correct in suggesting that the species described from the Pliocene of Venezuela as Pecten circularis caucanus by Hodson and Hodson (in Hodson, Hodson, and Harris, 1927, p. 27, pl. 15, figs. 1, 8) is the same as A. demiurgus. Occurrence. — RR 291, USGS, 18411, USGS 18634. Distribution. — Miocene of Columbia (Anderson, 1929, p. 155)? Upper Miocene Springvale Fm. of Trinidad. Pliocene of Lower California (Grant and Gale, 1931, p. 220)?» JUNG, P. 1969. Miocene and Pliocene mollusks from Trinidad. Bulletins of American Paleontology, 55 (247): 293-697, pls. 13-60. [p. 346]
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Aequipecten (Plagioctenium) demiurgus (Dall); P. Jung, 1969, Miocene and Pliocene mollusks from Trinidad, plate 20, figures 1, 2.
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