Euvola violae (Tucker-Rowland, 1936)
TUCKER-ROWLAND, H. I. 1936. The Atlantic and Gulf Coast Tertiary Pectinidae of the United States. The American Midland Naturalist, 17: 471-490, pls. 1-4 (Under H. I. Tucker). [p. 481, pl. 1, figs. 1, 2]
1936 Pecten ochlockoneensis violae Tucker-Rowland, 1936
H. I. Tucker-Rowland, 1936, plate 1.
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«Description.— Shell resembles ochlockoneensis in outine and shape of auricles. Right valve has 15 broad, low, slightly rounded rib. About 35 mm. from the beak a sulcus appears on the summit of each rib and deepens as it approaches the margin. Anteriorly there are two much narrower, simple ribs, and posteriorly three. Ribs wider than the interspaces. Whole valve sculptured with somewhat widely spaced, concentric lamellae. Submargins have only concentric lamellae. Auricles subequal; anterior byssal auricle, 4 obscure radials, posterior, 1; both closely lamellated. Interior broadly ribbed; auricular crura; provinculum. Left valve has 16 elevated, widely spaced, rounded ribs. Occasionally an intercostal. Valve concave in umbonal region. Disk and auricles have more dense, concentric lamellae than the right valve. An occasional rib shows a tendency to develop a sulcus. Radials on auricles obscure.
Remarks.— This subspecies is differentiated from ochlockoneensis by its fewer ribs, earlier and more marked tendency to develop sulci on the summits of the ribs, and more closely spaced concentric lamellae. Dimensions of syntypes.— Probably a single individual. Righ valve, height 91, width 92 mm.; left valve, height 88, width 90 mm. Locality.— Jack on Bluff, Fla. (type). Horizon.— Choctawhatchee (Miocene). Syntypes.— Paleontological Research Institution.» HELEN IONE TUCKER-ROWLAND, 1936
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«Pecten ochlockoneensis violae Tucker, 1936, is here elevated to species status. Pecten violae is larger than P. raveneli and P. brouweri. The upper valve is concave for the first 10 mm of the disk, then becomes nearly flat. The upper valves of P. raveneli and P. brouweri are evenly concave across the entire disk. Typical specimens of P. violae have 15 to 16 radial ribs.»
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. 72]
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