Spondylus perrini Wiedey, 1928
WIEDEY, L. W. 1928. Notes on the Vaqueros and Temblor formations of the California Miocene with descriptions of new species. Transactions of San Diego Society of Natural History, 5 (10): 95-182, pls. 9-21. [p. 138, pl. 17, figs. 6, 7]
1928 Spondylus perrini Wiedey, 1928
1928 Spondylus inezana Wiedey, 1928
1928 Spondylus inezana Wiedey, 1928
L. W. Wiedey, 1928, plate 17.
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«Pecten (Hinnites) giganteus Gray, Eldridge and Arnold, U.S. Geological Survey Bulletin No. 309, pl. 32, fig. 1, 1907. Not Lima gigantea Gray, Annals of Philosophy, N.S., Vol. 9, p. 39, 1825.
Shell large, variable in shape, narrowly ovoid, very inequivalve, slightly inequilateral, and very strongly inflated. Anterior dorsal margin not long, quite straight, sharply truncated at the extremity, curving into the broadly rounded basal margin, which varies in the degree of curvature owing to the irregularity of outline of the shell. Posterior dorsal margin short, curving slightly from its gently rounded extremity to the hinge line. Umbo of the left valve of much greater size than the umbo of the right valve. It is long, narrow, highly arched, and projected very markedly over the corresponding feature of the right valve. Umbo of the right valve, if elevated, is broadly inflated and quite blunt. The beaks are strongly incurved, sharp, and prominent. The sculpturing consists of about twelve or more prominent ribs, which are rendered rugose by having small spines, which evidently projected sharply forward, now broken away. Two or more smaller ribs sculpture the very wide interspaces. Incremental sculpture prominent. The hinge line is very short and the ears are very subdued and not prominent. The areas adjacent to the ears under the umbones in the combined valves are deeply depressed. Length, 85 mm.; breadth, 59 mm.; thickness of the combined valves, 60 mm.; the left valve projects as much as 20 mm. over the right valve in some individuals.
Holotype: L.S.J.U. type collection, type number 438, from S.D.S.N.H. and L.S.J.U. locality 437. Collected from the head of Wiley Canyon, Pirn quadrangle, Ventura County, California. Paratype: L.S.J.U. type collection, type number 423. J. S. McKenna and L. Wm. Wiedey, collectors ; Yaqueros formation, lower Miocene. This new species of Spondylus is in some respects resembled by S. gaederopus Linne, [79] the type of the genus. It may be separated from that living species in being more elongate, with higher umbones, and possessing the depressed areas adjacent to the ears. Named in honor of Dr. James Perrin Smith in appreciation of his very highly valued assistance and encouragement.» [79] Conchologia Iconica, Vol. 9, pl. 3, sp. 13, 1856.
LIONEL WILLIAM WIEDEY, 1928
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«Supplementary description.— "Wiedey describes two species, S. perrini and S. inezana, from the same locality and same bed. He states that both are very variable and that S. inezana differs in being less convex and more circular in outline.
"Study of a large number of specimens from the type and other localities in the region has shown that there is but one species present Spondylus perrini Wiedey by priority. The characters of convexity, valve equality, and height of umbo in the left valve are all differential in development, variability being of course due to the attached mode of habitat. It is the inequivalve variant form described by Wiedey as S. perrini, with the lower valve largest, which is usually comparatively less convex, not the reverse case as Wiedey states. "The variant described as 'S. inezana,' in which individual valves are more nearly equivalve owing to position of attachment, is usually much more convex (the reverse of Wiedey's observations)." (Loel and Corey, 1932, p. 203) Geographic range.— Middle and southern California. Geologic range.— Oligocene and Miocene. Occurrence in California.— Oligocene and Miocene: Rincon Shale (Avila and Weaver, 1969) and Vaqueros Formation (Loel and Corey, 1932); Miocene: Monterey Shale (Avila and Weaver, 1969).» MOORE, E. J. 1987. Tertiary Marine Pelecypods of California and Baja California: Plicatulidae to Ostreidae. United States Geological Survey Professional Paper, 1288-C: C1-C53, pls. 1-34. [p. C7, C8]
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Spondylus perrini Wiedey; E. J. Moore, 1987, Tertiary Marine Pelecypods of California and Baja California: Plicatulidae to Ostreidae, plate 2, figures 1, 4-7.
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«Spondylus perrini Wiedey is a characteristie form in the Vaqueros of the Santa Barbara embayment. Wiedey describes two species, S. perrini and S. inezana, from the same locality and same bed. He states that both are very variable and that S. inezana differs in being less convex and more circular in outline.
Study of a large number of specimens from the type and other localities in the region has shown that there is but one species present -- Spondylus perrini Wiedey by priority. The characters of convexity, valve equality, and height of umbo in the left valve are all differential in development, variability being of course due to the attached mode of habitat. It is the inequivalve variant form described by Wiedey as S. perrini, with the lower valve larges, which is usually comparatively less convex, not the reverse case as Wiedey states. The variant described as "S. inezana," in which individual valves are more nearly equivalve owing to position of attachment, is usually much more convex (the reverse of Wiedey's observations). Geologie range.— Vaqueros horizon, Lower Miocene only. Distribution.— Abundant, Santa Rosa and San Miguel Islands; present, western Santa Monica Mountains; abundant on Oak Ridge; present, Ventura River, San Antonio Creek, and Upper Sespe region, Ventura County; present, Bryson region and Vaqueros Greek, Monterey County; present, western Santa Ynez Mountains, Santa Barbara County.quí para editar.» LOEL, W. & W. H. COREY. 1932. The Vaqueros formation, lower Miocene of California I. Paleontology. University of California Publications, Bulletin of the Department of Geological Sciences, 22 (3): 31-410, pls. 4-65. [p. 203]
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Spondylus perrini Wiedey; W. Loel & W. H. Corey, 1932, The Vaqueros formation, lower Miocene of California I. Paleontology, plate 32, figures 1a-1c, 2.
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