Pecten (Chlamys) caloosensis 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. 52, pl. 3, figs. 1, 3]
«PECTEN CHLAMYS CALOOSENSIS Mansfield n. sp.
Plate 3, figures 1, 3 Chlamys (Plagioctenium) comparilis (Tuomey and Holmes) [part], Tucker-Rowland, Mus. royale historie nat. Belgique Mém. deuxième série, Fasc. 13, p. 43, pl. 4, fig. 14 [not pl. 3, fig. 11]. 1938.
Shell rather small, suborbicular, nearly equivalve and slightly inequilateral; posterior region more produced. Both valves with about 20 high, narrow, flat-topped, squarish ribs, separated by spaces a little wider than the ribs. Ears rather large, marked by 4 to 5 faint radials. Submargins without radials. Concentric sculpture of fine, closely spaced lamellae. Cotypes (U. S. Nat. Mus. No. 479979) measure: Right valve, length 48 millimeters; heigh, 49 millimeters; diameter, 15 millimeters. Left valve, length 47 millimeters; height, 47 millimeters; diameter, 14 millimeters. Type locality.— Station 14075, dredged from Caloosahatchee River, 1 mile below Olga. Horizon and occurrence.— Buckingham limestone, upper Miocene. Section 13927, Buckingham, Lee County; station 13928, dredged from Caloosahatchee River a half mile below Alva; station 1407, 2 miles above Olga; station 14076, 1 mile above Olga; station 4997, in place 1 mile above Caloosa. This species is related to Pecten comparilis Tuomey and Holmes, a known Miocene species, differing from the latter in having 2 or 3 fewer ribs and sculptured with finer concentric lamellae. It differs from P. evergladensis Mansfield in having a less expanded shell and narrower and higher ribs. The new species from Buckingham limestone at Buckingham and elsewhere, as noted above, is somewhat similar to but not identical with specimens from South Carolina that I consider typical of "Chlamys (Plagioctenium) comparilis (Tuomey and Holmes)." Tucker-Rowland designated a left valve from Buckingham, Fla., as the neoholotype of "Chlamys (Plagioctenium) comparilis (Tuomey and Holmes)." The present practice is to select a neoholotype from the original locality of the species, and it would conform more nearly with rules of zoological nomenclature to select a specimen from South Carolina rather than from Florida. Therefore, I designate a right valve in U. S. National Museum under the Catalogue No. 11447 from South Carolina identified by R. P. Whitfield as "Pecten comparilis Toumey and Holmes." The matrix on this specimen is the same as on other fossils from "Smiths Goose Creek," Berkeley County, S. Car. Although no specific locality is recorded for the specimen by Tuomey and Holmes it probably came from the Goose Creek locality. It agrees in detail with the original illustration of a right valve of Tuomey and Holmes species.» WENDELL CLAY MANSFIELD, 1939
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W. C. Mansfield, 1939, plate 3.
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