Delectopecten alterniliniatus (Clark, 1918)
CLARK, B. L. 1918. The San Lorenzo Series of middle California. University of California Publications, Bulletin of the Department of Geological Sciences, 11 (2): 45-234, pls. 3-24, 4 text figs. [p. 132, pl. 13, figs. 14, 15]
1918 Pecten (Pseudomuseum) [sic] alterniliniatus Clark, 1918
B. L. Clarck, 1918, plate 13
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«Shell small, thin, subcircular, compressed, equivalved, nearly equilateral. Apical angle close to 90. Surface covered by numerous fine, radiating, raised, bifurcated lines, which are nearly obsolete on most of the specimens examined, interspaces between the lines averaging a little wider than the width of the lines. Posterior ear of right valve not separated by a welldefined line from main surface of shell; posterior edge of ear straight, sloping outward; surface smooth on specimens at hand but probably originally radially sculptured, similar to that on the main surface of shell. Anterior ear of right valve very distinct, with a rather deep and acutely angular byssal notch; surface ofear covered by about five subnodose to spinose radiating lines. Ears of left valve similar to those of right except that anteriorly there is no byssal notch.»
BRUCE LAWRENCE CLARK, 1923
[Original description from E. J. Moore, 1984] |