Argopecten crassiradiatus (Clark, 1915)
CLARK, B. L. 1915. Fauna of the San Pablo Group of middle California. University of California Publications Bulletin of the Department of Geology, 8 (22): 385-572, pls. 42-71. [p. 450, pl. 47, fig. 7]
1915 Pecten (Plagioctenium?) crassiradiatus Clark, 1915
B. L. Clark, 1915, plate 47.
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«Shell medium in size; fairly heavy; apical angle about 98°; height about equal to the length; dorsal edges nearly straight. Hinge plate over half the length of the shell. Right valve sculptured by sixteen heavy, broadly rounded, radiating ribs, which become somewhat narrower near the margins; interspaces very narrow and deep. Dorsal margins rather strongly depressed, the depressed area being narrow and without ribs. Anterior ear longer than posterior, deeply notched with anterior edge gently convex, sculptured by four fairly heavy radiating ribs. Left valve unknown.
This species appears to be quite unique. The writer has seen only one specimen of the right valve. Dimensions.— Height 47 mm.; length apparently about the same as height. Occurrence.— In the lower San Pablo, associated with Astrodapsis tumidus, subsp. cierboensis, Scutella pabloensis, Chrysodomus pahloensis, etc., University of California locality 367». BRUCE LAWRENCE CLARK, 1915
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