Pecten (Pecten) ochlockoneensis Mansfield, 1932
MANSFIELD, W. C. 1932. Miocene Pelecypods of the Choctawhatchee Formation of Florida. Florida Geological Survey Bulletin, 8: 7-164, pls. 1-34. [p. 56, pl. 13, figs. 1, 3]
«Pecten (Pecten) ochlockoneensis Mansfield, n. sp.
Plate 13, Figures 1, 3 Shell of moderate size, equilaleral, sculptured with rather strong ribs. Right valve moderalely convex and evenly rounding to submargins, with 22 to 23 moderalely wide, nearly flat, dichotomous ribs separated by narrower interspaces, the three lateral ribs being a little weaker. Lefl valve with raised lateral margins weakly depressed behind the umbo and nearly flat below, and with 16 slightly rounded nondichotomous ribs with much wider interspaces. Ears on right valve subequal, large, the anterior marked with four radials and the posterior with the same number of weaker radials. Ears on left valve concave and marked with one radial situated near the hinge line on anterior ear and two on posterior ear. Surface of both valves covered with moderately coarse concentric lamellae.
Holotype, right valve (Cat. No. 371134, U. S. N. M.), measures: Length, 96 mm.; height, 84 mm.; diameter, 15 mm. Paratype, left valve (Cat. No. 371135, U. S. N. M.), measures: Length, 68 mm.; diameter, 62 mm. Type locality: Holotype collected from station 3423, lower upper Miocene bed at Jackson Bluff, Leon County; paratype collected from same locality as holotype but was obtained by the Florida Geological Survey from excavation for concrete mixer. Pecten raveneli Dall, a species described from the Caloosahatchee marl of Florida, when compared with the new species, has a smaller shell, a more convex right valve with more closely spaced ribs, a more depressed Ieft valve with more numerous and more closely spaced ribs, and is marked with much coarser radials on the ears. Pecten hemicyclicus (Ravenel) has a larger, heavier shell, more expanded and inflated right valve, and more depressed left valve. Occurrence: Upper Miocene: Ecphora zone, type locality. Cancelaria zone — station 7474, Rock Creek, south of Knox Still Landing, Franklin County; station 1/422, Hamlin Pond, Washington County (fragments, identification uncertain).» WENDELL CLAY MANSFIELD, 1932
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W. C. Mansfield, 1932, plate 13.
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