Interchlamys tamiamiensis (Mansfield, 1932)
MANSFIELD, W. C. 1932. Pliocene fossils from limestone in Southern Florida. United States Geological Survey Professional Paper, 170-D: 43-56, pls. 14-18. [p. 47, pl. 16, figs. 4, 6]
1932 Pecten (Lyropecten) tamiamiensis Mansfield, 1932
W. C. Mansfield, 1932, plate 16.
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«Shell rather small, ovate, moderately ventricose, equivalve, and nearly equilateral. Both valves similarly sculptured. Right valve sculptured with 23 major ribs, which are stronger over the middle of the disk and weaker on the lateral areas. The two marginal posterior ribs are paired and much weaker than the others. Interspaces occupied by a single strong, rounded riblet. Surface of shell ornamented with fine concentric, beakward-reflected imbrications. Anterior ear with a rather deep byssal notch and externally marked with six rather coarse radials; posterior ear with finer radials than anterior.
Dimensions: Holotype (catalogue No. 371325, U. S. Nat. Mus.), length, 69 millimeters; height, 74 millimeters. One right valve with the margins broken off and occurring at the type locality is a little larger than the holotype, its length being 82 millimeters and height 83 millimeters. Type locality: Station 1/1178, Tamiami Trail, 6 miles west of crossroads leading to Everglades, Collier County, Fla. Pecten mediacostatus Hanna [Hanna, G. D., Paleontology of Coyote Mountain, Imperial County, Callf.; California Acad. Sci. Proc., 4th ser., vol. 14, No. 18, p. 472, pI. 22, fig. 6, pl. 24, fig. 2, 1926], collected from "Alverson Canyon, on the south side of Coyote Mountain, Imperial County, Calif., in the Pliocene coral reef about midway up the canyon," apparently is the nearest related fossil species, but by a comparison made from the illustration, it appears to have a narrower shell with smaller ears than the new species. Occurrence: Pliocene. Station 1/1178, type locality (3 valves), station 1/1179 (6 valves).» WENDELL CLAY MANSFIELD, 1932
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