Carolinapecten eboreus bertiensis (Mansfield, 1937)
MANSFIELD, W. C. 1937. A new subspecies of Pecten from the Upper Miocene of North Carolina. Journal of the Washington Academy of Sciences, 27: 10-12, figs. 1-3. [p. 10, figs. 1-3]
1937 Pecten (Chlamys) eboreus bertiensis Mansfield 1937
W. C. Mansfield, 1937, figures 1-3.
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«Shell large, thin, ovate, inequilateral; hinge line rather short; left valve much more inflated than right; ornamented with 24 to 25 ribs. Right valve of cotype low, ornamented with 25 flat ribs, which are medially shallowly incised over the middle part of the disk and separated by shallow interspaces which are a little narrower than the ribs. The concentric lamellae are moderately coarse. Right ear shallowly insinuated and marked with 5 rather strong radials, those near the hinge line being the stronger; left ear with 11 moderately strong radials. Left valve of cotype with 25 ribs, narrower than interspaces and medially sulcated over the middle part of the disk and nearly flat ventrally. Both ears with about 7 radials.
Dimensions of cotypes (U.S.N.M. no. 496224): Right valve, length 86 mm; height 80 mm; convexity 11 mm; length of hinge line 44 mm. Left valve, length 95 mm; height 88 mm; convexity 24 mm; length of hinge line 50 mm. Type locality: Station 11999, from bed exposed at beach to 10 feet above in right bank of Chowan River, three-fourths of a mile below Mount Gould Landing, Bertie County, North Carolina. The new subspecies intergrades with Pecten eboreus eboreus Conrad and P. eboreus darlingtonensis Dall, but it is more closely related to the former than to the latter. The left valve of the new subspecies is more inflated than the same valve of either of the above subspecies, and it is marked with incised ribs which neither one possesses. Other occurrence in North Carolina: Station 12035 (lower bed), station 13814 (upper bed), Colerain Landing, Bertie County; station 1/1230, Tar Ferry, Wiccacon Creek, Hertford County; station 13798, upper bed at Beaver Dam Creek, Martin County; station 12004, Poplar Landing, Martin County. The beds in which the new subspecies occurs are placed in the uppermost Miocene of North Carolina and are believed to have been deposited at a little later time than the Suffolk beds in Virginia at the north and about the same time as the Dupoin marl at the south.» WENDELL CLAY MANSFIELD, 1937
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