Patinopecten calaverasensis (Hall, 1958)
HALL, C. A., JR. 1958. Geology and paleontology of the Pleasanton area, Alameda and Contra Costa Counties, California. University of California Publications, Bulletin of the Department of Geological Sciences, 34 (1): 1-90, pls. 1-12, 2 figs., 5 maps. [p. 51, pl. 2, fig. 2; pl. 3, fig. 4; pl. 4, fig. 3]
1958 Pecten (Patinopecten) haywardensis calaverasensis Hall, 1958
C. A. Hall Jr., 1958, plates 2-4.
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«Description.— Shell of moderate to large size; right valve convex, with 20 or 21 flat-topped ribs; ribs approximately twice as wide as interribs; bifurcating ribs common; small riblets common; left valve slightly flatter than right valve; growth lines well developed on left valve; bifurcating ribs not as frequent as on left valve; byssal notch well-developed; anterior ear longer than posterior ear and slightly convex; riblets on anterior ear crossed by growth lines; posterior ear nearly flat, with no well-defined riblets and with welldefined growth lines.
Dimensions.— Holotype, height, 89 mm. (incomplete); width, 96 mm. Paratypes, height, 120 mm. (incomplete); width, 121 mm. (incomplete). Holotype.— Stanford University Type Collection no. 8442. Paratypes.— Stanford University Type Collection nos. 8443, 8444. Occurrence.— L.S.J.U. locs. 3229, 3231, 3245, 3247 Remarks.— This subspecies may be distinguished from Pecten haywardensis Lutz by its greater number of ribs. Lutz (1951, p. 386) gives the rib count of P. haywardensis as 17. P. haywardensis calaverasensis has 20 or 21 ribs. The related P. propatulus has 15 or 16 ribs.
This new subspecies has been found only in the Middle Miocene, Oursan sandstone.» CLARENCE ALBERT HALL JR., 1958
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«Vertipecten may be ancestral to Patinopecten, a relation supported by biostratigraphic ranges and right valve morphologic characters of California taxa but not verified for taxa from the Pacific Northwest. A transitional form examined for this study was described as Pecten (Patinopecten) haywardensis calaverasensis Hall, 1958, middle Miocene "Temblor" Stage fossil from the Diablo Range east of San Francisco, Calif. Left-valve fragments have Patinopecten ribbing and no trace of the raised key ribs found in the youngest Vertipectens, but right valves resemble Vertipecten in rib number, profile, and arrangement.»
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. 80]
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«Holotype.— CAS/SU 8442.
Type locality.— SU 3252. Contra Costa County, Calif. Oursan Sandstone. Miocene. Comparison.—"This subspecies may be distinguished from Pecten haywardensis Lutz by its greater number of ribs. Lutz (1951, p. 386) gives the rib count of P. haywardensis as 17. P. haywardensis calaverasensis has 20 or 21 ribs. The related P. propatulus has 15 or 16 ribs." (Hall, 1958, p. 52) Comntents.— Patinopecten propatulus has 16-22 ribs on the right valve, 19 being most common. The right valve of P. calaverasensis has 20 or 21 ribs, and this feature does not distinguish it from P. propatulus. The right-valve ribs of P. calaverasensis are mostly lower, wider, and more closely spaced than on P. propatulus. ln addition, the interribs are wider than on P. propatulus,and the right posterior auricle is longer and much higher than the right anterior auricle; on P. propatulus the auricles are equal in length, and the right posterior auricle only slightly higher than the right anterior auricle. The right-valve ribs of P. calaverasensis are unevenly distributed by width and in this character somewhat resemble a specimen from the Astoria Formation, Oregon, identified as Vertipecten? cf . V. fucanus (Moore, 1963, pl. 21, fig. 4). On the underside of the holotype a portion of a left valve, presumably the same species, is preserved. The shell has narrow ribs that rapidly widen toward the ventral margin, interspaces as wide or wider each bearing a fine riblet, and preserved patches of imbricated microsculpture. The left valve was apparently almost flat. Geographic range.— Middle California. Geologic range. — Miocene. Occurrence in California.— Sobrante Sandstone.» MOORE, E. J. 1984. Tertiary Marine Pelecypods of California: Propeamussidae and Pectinidae. United States Geological Survey Professional Paper, 1228-B: iv + B1-B112, figs. 1-2, pls. 1-42. [p. B80]
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Patinopecten calaverasensis (Hall); E. J. Moore, 1984, Tertiary Marine Pelecypods of California, plate 35, figures 5, 6.
Vertipecten cf. V. fucanus (Dall); E. J. Moore, 1963, Miocene Marine Mollusks from the Astoria Formation in Oregon, plate 21, figure 4.
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