Paraleptopecten leonensis 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. 58, pl. 9, figs. 2, 3]
1932 Pecten (Pecten) leonensis Mansfield, 1932
W. C. Mansfield, 1932, plate 9.
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«Shell small, subovate, subequilateral, both valves strongly sculptured. Right valve strongly inflated; left valve nearly flat. Right valve sculptured with 10 or 11 sharp, triangular, primary ribs intercalated with an occasional secondary radial thread. Left valve with five primary and six secondary ribs, which are similar in outline to those on the opposite valve. The secondaries alternate in position with the primaries and are about half their size. Ears subequal and are ornamented with five moderately strong radials. The right anterior ear is strongly sinuate. The surface of the shell is concentrically sculptured with coarse scabrous lamellae. Within, the valves are strongly scalloped, reflecting the wide exterior intercostal spaces.
Cotypes (Cat. No. 371256, U. S. N. M.) measure: Right valve: Length, 16 mm.; height, 15 mm.; diameter. 4 mm. Left valve: Length, 18 mm.; height, 17 mm.; diameter. 2 mm. Type locality: Station 3423, lower upper Miocene bed at Jackson Bluff, Leon County, Fla. Occurrence: Upper Miocene: Ecphora zone — at type locality (three right and seven left valves); station 4992, 1 miles south of Holland post office, Leon County (two left valves); station 8862, half a mile northwest of Clarksville, Calhoun County (fragments, identification uncertain.) Outside occurrence: Specimens collected from the upper Miocene at stations 5241, 5242, highest fossiliferous beds at Porters Landing, Savannah River, Ga., agree very closely with the Florida specimens, differing mainly in having more rounded ribs. One right valve, probably representing a new epecies, collected from the Miocene at Raysors Bridge, Edisto River, S. C., is related to Pecten leonensis.» WENDELL CLAY MANSFIELD, 1932
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«The species-level taxonomy of Paraleptopecten n. gen. of the Late Miocene to Early Pleistocene is confused and in need of revision, in part because past authors have not fully appreciated the degree to which rib patterns vary. Using the method of encoding rib patterns explained in the Materials and Methods section, I have identified 17 rib patterns on the disks of LVs of extant P. bavayi in the Smithsonian (USNM) collection of Recent mollusks (Table 18). Specimens of P. olgensis (Mansfield, 1939) from the middle Pliocene of Florida, raised herein to species rank, falls within the range of variation of P. bavayi in terms of the rib pattern of the LV but differs from all living P. bavayi in lacking single medial costae in the interspaces of the RV. Paraleptopecten olgensis also has a narrower umbonal angle in early ontogeny and only one minor plica between the outermost major rib and shoulder of the disk flank on the anterior and posterior of the LV. Paraleptopecten leonensis (Mansfield, 1932) of the Pliocene Jackson Bluff Formation of Florida resembles P. olgensis in umbonal angle and lack of single medial costae, but differs in having only 11 ribs on the LV in the pattern /r R r R r Rc r R r R r\. Paraleptopecten wendelli (Tucker, 1934), from the upper Pliocene to lower Pleistocene Caloosahatchee Formation of Florida and the Waccamaw Formation of South Carolina, differs from P. olgensis mainly in having a single medial costae in each interspace originating in mid-ontogeny.»
WALLER, T. R. 2011. Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley. Bulletins of American Paleontology, 381: 1-197, pls. 1-18. [p. 92]
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«Description: Shell small, very thin, fragile; both valves convex, compressed; sculpture variable, typically, ribs 10-11, narrow, with wider interspaces, interspaces may have one to three radial threads. Auricles large.
Occurrence: Pliocene. Virginia – Yorktown, lower Zone 2; Carolinas – lower and upper Goose Creek Limestone, Raysor; Florida lower Pinecrest and Jackson Bluff. Type locality: Jackson Bluff, Leon County, Florida. «Discussion: Leptopecten wendelli (Tucker, 1934) has been synonymized with Leptopecten leonensis (Mansfield, 1932) by Ward and Blackwelder (1987, p. 1401. However, Waccamaw specimens of Leptopecten wendelli from Calabash, North Carolina, are distinctive and are not conspecific with the older Leptopecten leonensis. Leptopecten wendelli olgensis is not morphologically similar to L. wendelli, but it seems to be conspecitic with L. leonensis. Mansfield reported L. leonensis from the Ecphora zone of the Jackson Bluff Formation, from Porters Landing on the Savannah River, and a single specimen from Raysors Bridge. Tucker (1938) illustrated L. leonensis from supposed Waccamaw beds at Walkers Bluff on the Cape Fear River, which is also the type locality for Pecten brouweri Tucker, and Carolinapecten eboreus var. walkerensis Tucker, taxa that otherwise are restricted to faunules of the upper Goose Creek Limestone. It appears that Walkers Bluff contains reworked material or pre-Waccamaw strata, in addition to its better-known Waccamaw beds (Gardner, 1944). At the Berkeley Quarry, L. leonensis is fairly common in the lower Goose Creek Limestone, but is only rarely recovered from the younger Raysor sands.
Pecten harrisi Dall, 1898, may be another species of Leptopecten from the Caloosahatchee Formation.» CAMPBELL, M. R. & L. D. CAMPBELL. 1995. Preliminary Biostratigraphy and Molluscan Fauna of the Goose Creek Limestone of Eastern South Carolina.Tulane Studies in Geology and Paleontology, 27 (1-4): 53-100, pls. 1-5. [p. 74]
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Leptopecten leonensis (Mansfield); M. R. Campbell & L. D. Campbell, 1995, Preliminary Biostratigraphy and Molluscan Fauna of the Goose Creek Limestone of Eastern South Carolina, plate 1, figure 9.
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