Vertipecten diabloensis (Clark in Hanna, 1924)
HANNA, G. D. 1924. Rectifications of nomenclature. Proceedings of the California Academy of Sciences [4th Series], 13 (10): 151-186. [p. 176]
1918 Pecten (Lyropecten) gabbi Clark, 1918
1924 Pecten diabloensis Clark in Hanna, 1924 [nomen novum pro Pecten gabbi Clark, 1918]
1924 Pecten diabloensis Clark in Hanna, 1924 [nomen novum pro Pecten gabbi Clark, 1918]
Pecten (Lyropecten) gabbi, n. sp.; B. L. Clark, 1918, The San Lorenzo Series of middle California, plate 15, figures 1, 2.
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«Pecten gabbi Clark, Univ. Calif. Publ. Geol., Vol. 11, 1918, p. 131, pl. 15, figs. 1-2, Oligocene near Muir Station, Contra Costa County, California.
Not Pecten gabbi Dall, Trans. Wag. Free Inst. Sci., Vol. 3, pt. 4, 1898, p. 717, pi. 29, fig. 3, "Oligocene" of Antigua and San Domingo. The name of the California species, according to the rules, must be replaced, and Professor Clark's attention having been called to it, he proposes to denote it as above in a forthcoming monograph of West American Oligocene Pelecypoda. The West Indian species was originally called P. paranensis by Gabb, but according to Dall is not d'Orbigny's species of that name.» BRUCE LAWRENCE CLARK IN GEORGE DALLAS HANNA, 1924
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«Original description.—"Shell fairly large, heavy, equivalved; right valve flat; left valve convex. Apical angle about 100°; dorsal edges very nearly straight; ventral edge rather strongly convex. Left valve sculptured by about nineteen prominent and variable, rounded radiating ribs; on the type specimen, a left valve, seven of these ribs are heavier than the others; one radiating from the beak down to the middle ofthe ventral edge, three ofthe other ribs being anterior and three posterior to this; in each interspace between these major ribs is a less prominent and narrower rib, and in the interspaces between this narrower rib and the major ribs on each side of it is a still less prominent and more narrow rib; besides this, in some of the interspaces, there is a fourth set of ribs still less prominent than the others. The valve originally had strong and beautiful imbricated sculpturing, which does not show on the type specimen but is seen on some of the external casts. Ears large and heavy. One specimen of a cast of the anterior ear shows eight or nine radiating ribs; the ones next the dorsal margin being much finer than the others; surface of ear strongly imbricated. Right valve flat, sculptured by nineteen or twenty fairly heavy, rather broadly rounded, radiating, somewhat variable ribs; as on the left valve there is a tendency for some of the ribs to be heavier than the others, but this difference is not so great nor is the distribution of the heavy ribs so regular; apparently there were no riblets in the interspaces. Surface of right valve sculptured by imbricated incremental lines, which are coarser than on the left valve. Sculpturing of ears of right valve not preserved."
Holotype.— UCMP 11138. Type Locality.— UC 1311. Contra Costa County, Calif. San Ramon Sandstone, Miocene. Comparison.— " P. perrini is a very variable species, the sculpturing being more irregular than on P. gabbi [= P. diabloensis]; it has about the same number of ribs, and on some specimens certain of the ribs stand out more prominently than others, as is the case with P. gabbi. The imbricated concentric sculpturing appears to be much stronger on the former, is more irregular, and the inter-ribbing and striations are heavier." (Clark, 1918, p. 131) Geographic range.— Middle California. GeoIogic range.— Miocene (?). Occurrence in California.— San Ramon Sandstone.» MOORE, E. J. 1984. Tertiary Marine Pelecipods of California: Propeamussidae and Pectinidae. United States Geological Survey Professional Paper, 1228-B: iv + B1–B112, figs. 1-2, pls. 1-42. [p. B64]
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Vertipecten diabloensis (Clark); E. J. Moore, 1984, Tertiary Marine Pelecipods of California, plate 21, figure 2 (above); plate 39, figure 4 (below).
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«Taxonomic comment.— Vertipecten kernensis (Hertlein) is the oldest valid name for the taxon known as V. nevadanus Conrad of authors. For 75 years it was assumed that the external mold described by Conrad as Pecten nevadanus from Ocoya (now Poso) Creek was the same as the well-preserved form occurring in abundance in basal ledges at Pyramid Hill several miles to the southeast. Subsequent stratigraphic and systematic studies distinguished an older Vertipecten in the undivided Freeman Silt and Jewett Sand unit at Pyramid Hill and two younger species, V. fucanus and V. bowersi, in the overlying Olcese Sand that crops out to the north of Poso Creek. Conrad's name probably referred to one of the younger species (see discussion under V. bowersi) and the next available name for V. nevadanus auctt. is V. kernensis (Hertlein).
Pecten gabbi Clark, 1918 (a homonym renamed P. diabloensis Clark by Hanna, 1924) from the Diablo Range of northern California, is probably the same species. It is known from a few poorly preserved specimens that lack the detailed locality and biostratigraphic data of V. kernensis.» SMITH, J. T. 1991. Cenozoic Giant Pectinids from California and the Tertiary Caribbean Province: Lyropecten, "Macrochlamis", Vertipecten, and Nodipecten species. United States Geological Survey Professional Paper, 1391: v + 1-155, figs. 1-18, pls. 1-38. [p. 81, 82]
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LV, holotype UCMP 11138 of Pecten (Lyropecten) gabbi Clark, 1918 and of Pecten diabloensis Clark in Hanna, 1924; J. T. Smith, 1991, Cenozoic Giant Pectinids from California, plate 36, figure 5.
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