Antillipecten flintensis (Mansfield, 1937)
MANSFIELD, W. C. 1937. Mollusks of Tampa and Suwannee Limestones of Florida. Florida Department of Conservation, State Geological Survey, Geological Bulletin, 15, 334 p [p. 206, pl. 14, figs, 1, 3]
1937 Chlamys (Aequipecten?) flintensis Mansfield, 1937
W. C. Mansfield, 1937, plate 14.
|
«1898. Pecten (Lyropecten) sp. indet. a Dall, \Magner Free Inst. Sci. Trans., vol. 3, pt. 4, p. 725.
Dall [107] in 1916 described and figured a specimen (U. S. National Museum no. 166711) from station 7075, east bank of Flint River, about 10½ miles below Bainbridge and just above Lambert Island, Ga., and named it Pecten (Lyropecten?) alpha. Dall included in the species also a formerly undetermined specimen from Suwannee Sulphur Springs, Suwannee River, Suwannee County, Fla (U. S. National Museum no. 137901). The specimen from Flint River is regarded here as the holotype of P. alpha Dall. Better preserved specimens of the form from Suwannee River, including both valves, collected in 1930-31, prove to be different from P. alpha Dall and are here referred to a new species, Chlamys (Aequipecten) flintensis, with the following description:
Shell of moderate size, slightly longer than hight, thin, suborbicular in outline, nearly equilateral and nearly equivalve, weakly compressed over the umbonal area and moderately convex over the middle part of the disk. Right valve with 12 ribs; those over middle of the disk are strong, while those on the sides gradually diminish in strength. The anterior rib is thread-like and situated at the upper border of the submargin and the posterior rib is slightly stronger than the anterior and situated at the upper border of the submargin. The ribs barely or faintly reach the beak. The ribs are rounded, widely spaced, and are nearly smooth except for a very fine, medial raised thread and weak concentric undulations. Submargins smooth. Ears large, the right being a little longer than the left. Right ear with a deep byssal notch and marked with 5 strong, scaly radials; left ear without radials. Left valve with same number and similarly arranged ribs as right valve; ears large and without visible radials. Dimensions: Cotypes (U. S. National Museum no. 495973). Right valve: Length, 41.5 mm.; height, 37.5 mm.; convexity, 7 mm. Left valve: Length, 46 mm.; height, 41mm. Type locality: Station 12298, 1½ miles east-southeast of Flint Rock, Jefferson County, Fla. Horizon: Suwannee limestone, Oligocene. Chlamys flintensis differs from Pecten alpha Dall in the absence of radials on the disk of the shell and on the posterior ear of the right valve and also in havillg a flatter umbonal area. It belongs to the same group as Pecten vaun Cooke, a species collecled at Crocus Bay, Anguilla, and is similar to it in a number of features, but differs from it in having a flatter umbollal area and fewer and stronger ribs. Perhaps the new species is more closely related to Pecten vaun wythei Hertlein, a variety from La Cruz and Santiago, Cuba, but it has fewer ribs by 3 than that variety and apparently lacks the striations on the anterior ear of the left valve that the variety wythei possesses. It is also related to Chlamys (Aequipecten) phrygium Dall, a living species ranging from Cape Cod to the West Indies. The section to which the new species belongs has not been fully determined. It is questionably placed in the section Aequipecten. Occurrence: Station 11110, Suwannee Sulphur Springs, Suwannee County; stations 11109 and 12308, 1½, miles north or Live Oak, Suwannee County; station 3672, Wacissa swamp, Jefferson County; station 12299, Walker Spring, Jefferson County. station 12737, 7.9 miles west of Perry, Taylor County.» [107] Dall, W. H., U. S, Nat. Mus. Proc. vol. 51. no. 2162. p. 492, pl. 84, fig. 9, 1916.
WENDELL CLAY MANSFIELD, 1937
|
«Based on the examination of extensive collections at the Smithsonian Institution, at least the following species in addition to the type species are assigned to Antillipecten, beginning with the geologically oldest: Chlamys (Aequipecten?) flintensis Mansfield, 1937, Suwannee Limestone (sensu Huddlestun, 1993: 70), early Oligocene (Vicksburgian), Florida.»
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. 112]
|