Leptopecten weaveri (Clark, 1915)
CLARK, B. L. 1915. Fauna of the San Pablo Group of middle California. University of California Publications, Bulletin of the Department of Geological Sciences, 8 (22): 385-572, pls.42-71. [p. 454, pl. 45. figs. 1-2]
1915 Pecten (Patinopecten) weaveri Clark, 1915
B. L. Clark, 1915, plate 45.
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«Shell discoidal, broader than high, equilateral, nearly equivalved; apical angle about 90º; dorsal edges gently concave; hinge line about half the length of the shell. Right valve sculptured by about fourteen low, broad-topped, squarish ribs, the interspaces between which are flat-bottomed and about as wide as the tops of the ribs. Surface concentrically sculptured by rather coarse, somewhat irregular incremental lines. Anterior ear slightly longer than posterior, deeply notched, sculptured by three medium coarse, radiating ribs. Posterior ear marked by two or three faint radiating riblets. Left valve sculptured by fourteen fairly prominent, rounded, radiating ribs with interspaces about equal to the width of the ribs; the ribs next to the dorsal edges are not so prominent as the others. Surface also covered by fine, sharp, incremental lines. Anterior and posterior ears each marked by three medium fine, radiating riblets; anterior edge of anterior ear slightly notched.
The differences in the sculpturing on the two valves is quite noticeable; the left valve, with fairly prominent ronnded ribs and the sharp incremental lines, contrasts quite strongly with the right valve, with its low, squarish ribs and coarser incremental lines. Named in honor of Professor Charles E. Weaver of the University of Washington. Dimensions.— Of left valve, plate 45, tigure 2. Height, 34 mm.; length, 36 mm. Occurrence.— From the basal beds of the San Pablo group on San Pablo Bay, University of California localities 1141 and 401.» BRUCE LAWRENCE CLARK, 1915
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