Leopecten bakeri bakeri (Hanna & Hertlein, 1927)
HANNA, G. D. & L. G. HERTLEIN. 1927. VI. Expedition of the California Academy of Sciences to the Gulf of California in 1921. Geology and Paleontology. Proceedings of the California Academy of Sciences [4th Series], 16 (6): 137-157, pl. 5. [p. 153, pl. 5, fig. 1]
1927 Pecten (Patinopecten) bakeri Hanna & Hertlein, 1927
G. D. Hanna & L. G. Hertlein, 1927, plate 5.
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«Left valve, large, subcircular, moderately convex, moderately thick; about 23 to 25 radiating square sided ribs separated by interspaces a little wider than the ribs, each rib ornamented with three small riblets, one on each shoulder and a middle riblet which is a little higher than the two other riblets; interspaces ornamented by three small riblets, the middle one usually slightly more prominent than the other two; ribs and interspaces both covered by fine, fairly sharp concentric lines of growth; ears subequal, set off from beak by sharp squarish shoulders, ornamented by about eight or nine radiating riblets which are crossed by concentric incremental lines. Length approximately 150 mm.; height approximately 132 mm.; apical angle approximately 123°.
Holotype: left valve No. 1865, from Loc. 794 (C.A.S.) "Cuesta Blanca" on Arroyo de Area, 15 miles north of Loreto, Lower California; paratype: left valve, No. 2214, same locality; Fred Baker, collector; upper Pliocene. Pecten bakeri differs from other patinopectens by the number and arrangement of the secondary ribs, which ornament the ribs and interspaces. This fine species is named for Dr. Fred Baker of San Diego, California, who collected the type specimen; it is one of the most striking pectens discovered in western North America in many years. Fragments of a pecten in the collection from Loc. 937 (C.A.S.) on Maria Madre Island, which were collected by Hanna & Jordan, apparently belong to this species.» GEORGE DALLAS HANNA & LEO GEORGE HERTLEIN, 1927
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«RANGE: lower Pliocene.
REMARKS: Six specimens ranging in height from 46-143 mm were found at loc. A 3557 which is near the type locality. The ribs on the left valve are rather low and are not distinctly square-sided, but have a rounded appearance. On the surface of the primary ribs there are three to four fine secondary ribs. Laterally on the left valve, both anteriorly and posteriorly, there is a considerable area of fine ribbing. This species may easily be distinguished from Pecten lzealeyi Arnold by the less prominent ribs and by the greater apical angle. It is obviously of the same stocks as P. caurinus Gould, rather than the P. stearnsii Dall stock to which Grant and Gale assignd it. Their figured specimen appears to be P. bakeri subsp. diazi n. subsp. P. bakeri may be separated from the subspecies diazi by having the interspaces and ribs of the right valve of approximately the same width.» 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. 66]
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Patinopecten bakeri (Hanna and Hertlein); J. W. Durham, 1950, Megascopic paleontology and marine stratigraphy, plate 12, figure 1; plate 13, figure 7.
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