Pecten (Pecten) ochlockoneensis leensis Mansfield, 1939
MANSFIELD, W. C. 1939. Notes on the upper Tertiary and Pleistocene mollusks of Peninsular Florida. Florida Geological Survey Bulletin, 18: 5-75, pls. 1-4. [p. 50, pl. 2, fig. 3; pl. 4, fig. 9]
«PECTEN (PECTEN) OCHLOCKONEËNSIS LEËNSIS Mansfield, n. subsp.
Plate 2, flgures, 3; Plate 4, figure 9. Left concave valve rather deeply concave throughout except for the lateral margins, which are bevelled. Ears large, equal, bent backward in harmony with the convexity of the disk; marked by one incised radial and crossed by closely spaced lamellae. Submargins rounded and without radials. Ribs 13 to 16 (15 on the cotype) in number, all lying in the concavity, nearly flat over the early and middle part of the disk and very gently concave distally, with flat interspaces twice as wide as the ribs. Whole surface marked by very closely spaced concentric lamellae.
Righ convex valve not entire, evelly rounded. Ears bent downward, marked only by growth structures. Disk with about 19 nearly flat, smooth ribs, (the three on the lateral side being weaker), distally widening, separated by narrower spaces Cotypes (U. S. Nat. Mus. No. 497982) measure: Left valve, length 63 millimeters; height, 56 millimeters. Right valve, height 44 millimeters; convexity about 12 millimeters. Type locality.— Station 13927, Buckinham , Lee County, Florida. The new subspecies is closely related to Pecten (Pecten) ochlockoneënsis Mansfield from the upper Miocene of Florida. The left valve of the subspecies has a deeper convexity than the species, and the right valve has wider ribs, wich show a little less tendency to bifurcation. The concentric lamellae on the new subspecies are also finer. Horizon and occurrence.— Buckinham limestone, upper Miocene. Abundant at type locality; Station 14075, dredged from Caloosahatchee River one mile below Olga. The specimen from the following stations are related but may not be the same. Station 13409, 16 to 18 miles south of Immokalee, Collier County (two left valves, less concave); Station 12923, 18 miles south of Immokalee (1 left valve less compressed); Station 11180, Tamiami Trail at Carnestown, Collier County (fragment); Station 11176, about 11 miles east by north of Marco, Collier County (fragment).» WENDELL CLAY MANSFIELD, 1939
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W. C. Mansfield, 1939,
plates 2, 4. |