Euvola vogdesi (Arnold, 1906)
ARNOLD, R. 1906. The Tertiary and Quaternary pectens of California. United States Geological Survey Professional Paper, 47: 1-264, pls. 1-53.[p. 100, pl. 33, figs. 1, 1a; pl. 34, fig. 1]
1835 Pecten dentatus Sowerby I, 1835
1846 Pecten excavatus Valenciennes in Petit-Thouars, 1846
1906 Pecten (Pecten) vogdesi Arnold, 1906
1914 Pecten (Euvola) cataractes Dall, 1914
1846 Pecten excavatus Valenciennes in Petit-Thouars, 1846
1906 Pecten (Pecten) vogdesi Arnold, 1906
1914 Pecten (Euvola) cataractes Dall, 1914
R. Arnold, 1906, plates 33, 34.
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«Description.— Shell similar to P. excavatus, except averaging larger and with the following differences: Right valve, somewhat less convex, has 19 or 20 broader, flatter ribs, which are separated by relatively broader interspaces that occasionally show faint intercalary riblers or faint longitudinal striations, Left valve with fewer ribs than P. excavatus, and having no intercalary riblets, or else faint ones, which become obsolete near the periphery of the disk; ears slightly less concave than in P. excavatus.
Dimensions.— Alt. 69 mm.; hinge line to ventral margin (right valve) 67 mm.; long. 73 mm.; hinge line 35 mm.; diameter 24 mrn.; umbonal angle (left valve) 98°. All of the Pleistocene specimens of the group of which P. excavatus is the living representative have the constant differential characteristics above enumerated. These differences are so constant and so pronounced that they are deemed hy the writer to be of specific importance. A fragment of a right valve in the California Academy of Sciences from the Pleistocene of Ventura County is over 120 millimeters in length. The type of this species (a right valve) is from the upper San Pedro formation at San Pedro, and is now in the collection of Delos Arnold. The cotype, a left valve from the Pleistocene of Ventura County, is now in the collection of the California Academy of Sciences. The horizon of some large specimens of this species in the Philadelphia Academy collected by Mr. Hemphill near San Diego is uncertain. Named in honor of Gen. A. W. Vogdes, U. S. Army. RANGE.
Pleistocene. San Pedro (Arnold); Ventura County (Bowers); San Diego (Hemphill).
Pliocene (?). San Diego (Hemphill); Cholas Valley, near San Diego (Stearns).» RALPH ARNOLD, 1906
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«Shell large (altitude 70 to 100 mm.), slightly longer than high, inequivalve, the right valve being convex, its umbone projecting above the hinge line, the left valve concave, equilateral, and with more or less serrate margins. Ribs in the right valve about 20; these are wide, low and rounded, broader than high, separated by narrower interspaces, their surface smooth except for incremental lines which loop across them. Ribs in the left valve about 19; these are narrow, squarish, flat-topped, about equal in width to their interspaces, sometimes longitudinally sulcated or ridged, interspaces flat-bottomed, usually with a well-developed mid-rib, the surface sculptured by numerous fine, sharp concentric lines, more marked in the interspaces. Ears subequal, the right anterior with a byssal notch. Color salmon or salmon-pink, the left valve usually darker.
The type of P. vogdesi is a shell from the Pleistocene of San Pedro, California. Arnold considered it as distinct from the Recent species which he identified as P. excavatus Anton, a Chinese and Japanese species. All later writers agree that the fossil and Recent forms belong to the same species. Although Sowerby described P. dentatus as from Santa Elena, this locality citation is perhaps erroneous, due to mixed labels. The present writer has seen no authentic specimens south of Mexico. Range — Magdalena Bay, Lower California, Gulf of California to Panama. For records see Hertlein and Strong.» OLSSON, A. A. 1961. Mollusks of the Tropical Eastern Pacific, Particularly from the southern half of the Panamic-Pacific Faunal Province (Panama to Peru). Panamic-Pacific Pelecypoda. 574 p., pls. 1-86. Paleontological Research Institution. New York , USA. [p. 158]
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Pecten (Pecten) vogdesi Arnold; A. A. Olsson, 1961, Mollusks of the Tropical Eastern Pacific, plate 20, figures 4-4b.
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«RANGE: lower Pliocene to Recent.
REMARKS: No consistent difference has been noted between the Pliocene and Recent specimens. The secondary riblets are rarely present.» DURHAM, J. W. 1950. Megascopic paleontology and marine stratigraphy. In 1940 E. W. Scripps Cruise to the Gulf of California, Part II. Geological Society of America Memoir 43: 1-216, pls. 1-48. [p. 61]
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Pecten (Pecten) vogdesi Arnold; J. W. Durham, 1950, Megascopic paleontology and marine stratigraphy, plate 8, figures 4, 6.
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