Lyropecten pulchricosta (Meyer & Aldrich, 1886)
MEYER, O. & T. H. ALDRICH. 1886. The Tertiary Fauna of Newton and Wautubbee, Miss. Journal of the Cincinnati Society of Natural History, 9 (2): 40-50, pl. 2. [p. 45, pl. 2, figs. 23, 23a]
1886 Pecten pulchricosta Meyer & Aldrich, 1886
O. Meyer & T. H. Aldrich, 1886, plate 2.
|
«Convex, covered by eightn broad, rounded, radiating ribs, perceptible in the inside; those in the middle are largest. Near the ventral margin they dissolve into more numerous ribs.
Wautubbee. Only the figured valve is known.» OTTO MEYER & TRUMAN HEMINWAY ALDRICH, 1886
|
«Ribs of the hypotypes show a tendency to divide on the beaks, as do those of the holotype. One has a sulcus on the summits of the ribs near the ventral margin: anteriorly and posteriorly 2 or 3 occur on each rib. Ribs are the shape of an inverted V; wider than the approximately V-shaped interspaces. Intercostals tend to disappear about 6 mm. from the beak, except occasionally on the anterior slope. Commonly well developed, closely spaced, concentric lines appear on the disc and extend across the small auricles. About 1 to 5 scabrous radial threads on each auricle. Internally strong ribs appear opposite the interspaces and extend to the beak.
Ribs of the holotype have deep sulci on their summits extending 3 mm toward the ventral margin from the beak. Near the ventral margin the ribs are distinctly keeled: interspaces broadly V-shape. Valve concentrically sculptured with close-set, little elevated lamellae. Submargins plain, narrow, steep. Byssal auricle has 3 very obscure radials; narrow, rather deep fasciole. Ctenolium and provinculum present. DIMENSIONS. — Holotype, height 13.8; width 11 mm. Hypotypes: Left, height 13, width 11 mm.; another left valve, height 16, width 11 mm. LOCALITY. — Wautubbee, Miss. (type). Aldrich and Meyer, and Harris. HORIZON. — Claiborne (Eocene). HYPOTYPES. — Collection Cornell University. HOLOTYPE. — Collection The Johns Hopkins University.» TUCKER-ROWLAND, H. I. 1938. The Atlantic and Gulf Coast Tertiary Pectinidae of The United States. Section III Systematic Descriptions. Mémoires du Musée Royal D'Historie Naturelle de Belgique [2me Série], 13: 1-76, pls. 1-6. [p. 6]
|
Chlamys (Lyropecten) pulchricostata [sic] (Aldrich and Meyer); H. I. Tucker-Rowland, 1938, The Atlantic and Gulf Coast Tertiary Pectinidae of The United States, plate 4, figure 11; plate 6, figure 2.
|