Delectopecten pedroanus (Trask, 1856)
TRASK, J. B. 1856. Description of three new species of the genus Plagiostoma, from the Cretaceous rocks of Los Angeles. Proceedings of the California Academy of Sciences, 1: 86, pl. 3. [p. 86, pl. 8, fig. 1]
1856 Plagiostoma pedrona Trask, 1856
1856 Plagiostoma annulatus Trask, 1856
1856 Plagiostoma truncata Trask, 1856
1856 Plagiostoma annulatus Trask, 1856
1856 Plagiostoma truncata Trask, 1856
J. B. Trask, 1856, plate 3.
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«Shell compressed; sub-triangular, with eight or nine flatly rounded concentric annulations, which are nearly as distinctly marked on the interior of the valve for about half the height from the ventral margin; (see fig. 1. A.) beaks acute at the apex, and as high as the line of the auricles; anterior auricle rounded in front, and has a small, thin fold extending from the umbone to the centre of its anterior margin, and is covered with about thirteen small, rounded, radiating striae, which converge at the beak; beaks at the anterior third; sub-acute; anterior margin rounded, and somewhat produced; ventral margin smoothly arched; posterior margin rounded, becoming slightly arcuate toward the dorsam of the shell; posterior auricle angulate, and obtusely truncate posteriorly. Length one and eight-twentieths of an inch; height one and four-twentieths of an Inch. Locality, San Pedro, Cal.»
JOHN BOARDMAN TRASK, 1856
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