Swiftopecten swiftii parmeleei (Dall, 1898)
DALL, W. H. 1898. Contributions to the Tertiary fauna
of Florida. Silex Beds of Tampa and the Pliocene Beds of the Caloosahatchie
River. Part IV. I. Prionodesmacea: Nucula to Julia. 2. Teleodesmacea: Teredo to
Ervilia. Transactions of the Wagner Free Institute of Science of Philadelphia,
3 (4): viii, 571-947 p., pls. 23-35 (pls. 36 and 37 in part 5, 1900). [p. 708, pl. 37, figs. 14, 14a]
W. H. Dall, 1900, plate 37.
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«Pliocene of San Diego, California; Parmelee.
This species is close to P. Swiftii Bernhardi of Japan (J. de Conchyl., vii., plates 1 and 2, 1858) but smaller, and differs by the smooth top surface of the ribs, which in P. Swiftii are more or less striated or coarsely threaded, and by the not alternated radial riblets on the right posterior ear; also, especially, by the profuse coalescent microscopically checkered squamation, which makes a complete external coating to the valve. Alt. 45, lat. 38 mm.» WILLIAM HEALEY DALL, 1898
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«Swiftopecten parmeleei parmeleei (Dall) ranges in age from late Miocene to Pliocene and occurs from Alaska to southern California (Moore, 1984). Arnold (1908a) reported this taxon (as Pecten wattsi Arnold) from his middle member. Touring (1959) and Cummings and others (1962) combined this taxon with Nanaochlamys nutteri (Arnold) so its stratigraphic occurrence is in question until specimens are examined, although they reported it from the Tahana and Pomponio Members. Cummings and others (1962) illustrated a specimen from the lowest Tahana Member of the Purisima Formation which is referable to this taxon and not Nanaochlamys nutteri (Arnold). It has also been reported from the Tehana Member by Durham and Morgan (1978), the Sargent oil field area by Martin (1916) (as Pecten wattsi Arnold), and from the upper shell and Crepidula facies of Perry (1993) at the Capitola City Beach section.»
POWELL II, C. L. 1998. The Purisima Formation and related rocks (upper Miocene - Pliocene), greater San Francisco Bay area, central California. Review of literature and USGS collection (now housed at the Museum of Paleontology, University of California, Berkeley). United States Geological Survey Open-file Report, 98-594, 102 p. [p. 64]
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«Comparison.— "The dorsal (umbonal) part of the shell of large specimens of C. parmeleei is more inflated than that of C. swiftii and is more strongly set off from the ears * * *. C. parmeleei has concentric swellings, whereas C. parmeleei etchegoini lacks the swellings." (Woodring, 1950, p. 83)
"Parmeleei differs from the closely related Swiftopecten swiftii in having smaller shell which tends to become rounded with growth and somewhat larger apical angle." (Masuda, 1972) "A comparison of large specimens of Chlamys (Swiftopecten) parmeleei with C. (S.) swiftii from Japan reveals that on C. (S.) parmeleei and its subspecies the left posterior ear is generally sculptured with finer more nearly equal riblets. The radial ribs on both valves of the Japanese species tend to bifurcate toward the ventral margin whereas those on C. (S.) parmeleei only rarely show this feature. Furthermore the west American forms do not reach the size of C. (S.) swiftii which attains a height of at least 108 mm." (Hertlein and Grant, 1972, p..208) Geographic range.— Alaska; middle to southern California. Geologic range.— Miocene(?); Pliocene; Pleistocene(?). Occurrence in California.— Miocene: Castaic Formation (Stanton, 1966); Miocene and Pliocene: Capistrano (Kern and Wicander,1974), Etchegoin (Arnold, 1906; Woodring and others, 1940), Purisima (Arnold, 190-p), and Tahana Member, Purisima (Cummings and others, 19621 Durham and Morgan, 1978) Formations; Pliocene: Cebada Member, Careaga Sandstone (Woodring, 1950), lower member, Fernando (Durham and Yerkes, 1964), Nieuel (Vedder, 1960), Pico (Addicott and Vedder, written commun., 1968), San Diego (Hertlein and Grant, 1972), San Joaquin (Woodring and others, 1940) Formations; Pliocene and Pleistocene: Merced Formation (Arnold, 1906) and Wildcat Group (Arnold, 1906).» 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. B59, B60]
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Swiftopecten parmeleei parmeleei (Dall); E. J. Moore, 1984, Tertiary Marine Pelecypods of California: Propeamussidae and Pectinidae, plate 23, figures 1,3,4.
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«Parmeleei is characterized by its small shell which is contorted posteriorly in the younger stage but tends to become rounded with growth, four prominent but rather low, round-topped radial ribs which are broader than their interspaces with several, fine radial threads, two subordinate radial ribs near submargins, rather conspicuous concentric constrictions, very large triangular auricle in the right valve, and by the left valve having five round-topped radial ribs.
Parmeleei differs from the closely related Swiftopecten swiftii in having smaller shell which tends to become rounded with growth and somewhat larger apical angle. Thus, morphologically, parmeleei may have descended from swiftii and is considered a subspecies of swiftii. From Chlamys cosibensis (YOKOYAMA) parmeleei differs by its higher shell which is posteriorly contorted in the younger stage and triangular anterior auricle. GRANT and GALE (1931) figured parmeleei from the Middle Pliocene deposits at Holser Canyon, Los Angeles, California, but their specimens should be identified probably with Chlamys species. In 1950 WOODRING and BRAMLETTE illustrated Chlamys parmeleei from the Pliocene Careaga Sandstone, Santa Maria district, California. However, according to the writer's study of the hypotype specimen (U.S. Natl. Mus., No. 560101) their parmeleei should be identified with Chlamys etchegoini (ANDERSON). GLEN (1959) described Pecten (Pallium) swiftii etchegoini from the "Merced" Formation, San Mateo, California, but the writer considers that GLEN's specimen (Mus. Paleont., Univ. Calif. Berkeley, No. 37614) should be identified with parmeleei. In 1966 STANTON recorded parmeleei from the Late Miocene Castaic Formation, Los Angeles, California, but STANTON's specimen has not been authenticated. Type locality:— Pacific Beach, San Diego, California. Distribution:— Middle to Southern California. Middle Pliocene.» MASUDA,
K. 1972. Swiftopecten of the Nothern Pacific. Transactions and
Proceedings of the Palaeontological Society of Japan [N. S.], 87:
395-408, pls. 48, 49. [p. 401, 402]
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Swiftopecten swiftii parmeleei (Dall, 1898); K. Masuda, 1972, Swiftopecten of the Nothern Pacific, plate 48, figures 6, 7; plate 49, figures 6-8.
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