Lyropecten dysoni (Tucker-Rowland, 1938)
TUCKER-ROWLAND, H. I. 1938. The Atlantic and Gulf Coast Tertiary Pectinidae of Tne United States. Section III Systematic Descriptions. Mémoires du Musée Royal D'Historie Naturelle de Belgique [2 Série], 13 [p. 5, pl. 4, fig. 9]
1938 Chlamys (Lyropecten) dysoni Tucker-Rowland, 1938
H. I. Tucker-Rowland, 1938, plate 4.
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«DESCRIPTION.— Shell equilateral, slightly convex, strongly sculptured. Nine strong, simple, keeled ribs which, on the central portion of the disk have a cord on their summits. Fine imbricating, concentric sculpture which is reflected toward the ventral margin on the summits of the ribs and passes directly across the wide, deep, somewhat flattened interspaces. Submargins narrow, steep, only concentric ornamentation. Auricles large, nearly equal; 2 or 3 very obscure radials on the left anterior auricle. Interior fluted.
REMARKS.— This species appears to be entirely distinct from any described east coast species. It seems to have more in common with vaccamavensis than with any other species. It lacks the radial sculpture in the interspaces and has fewer ribs than that species. DIMENSIONS.— Holotype, height 54, width 45 mm. LOCALITY.— Near Ocala, Fla. (type). HORIZON.— Jackson (Eocene). HOLOTYPE.— Collection H. I. Tucker-Rowland.» HELEN IONE TUCKER-ROWLAND, 1938
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