Leopecten boesei (Hanna & Hertlein, 1927)
HANNA, G. D. & L. G. HERTLEIN. 1927. Expedition of the California Academy of Sciences to the Gulf of California in 1921. Proceedings of the California Academy of Sciences [4th Series], 16 (6): 137-157. [p. 154, pl. 5, figs. 2, 3]
1927 Pecten (Pecten) bösei Hanna & Hertlein, 1927
G. D. Hanna & L. G. Hertlein, 1927, plate 5.
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«Shell fairly large; right valve convex, ornamented by about 24 to 25 rather low, fllattish-topped ribs wdiich seldom show sulcation; interspaces narrower than ribs, flattish but sliglitly rounded at edges; ribs and interspaces crossed by fine concentric incremental lines; ears fairly large, subequal; anterior shows a faint byssal notch, above which the anterior ear slopes to hinge line forming an oblique angle; this ear possesses a fold near base; posterior ear slopes fairly abruptly to shell; ears set off from shell by sharp line and both ears ornamented by fine incremental lines of growth. Left valve slightly convex, ornamented by about 24 to 25 radiating, rounded ribs and interspaces, crossed by fine concentric incremental lines; ears slope from hinge line obliquely toward margin of shell. Length of right valve 74 mm.; height, 66 mm.; apical angle, approximately 100º; hinge length, 28 mm,
Syntypes: right valve, No. 2215 and left valve No. 2216, from Loc. 795 (C.A.S.); canon about half a mile inland from Santa Antonita Point, Lower California. Paratypes: Nos. 2217; 2218; 2219; 2220; 2221 (C.A.S.) from same locality; Fred Baker, collector; upper Pliocene. This species differs from P. stearnsii Dall and P. diegensis Dall in possessing much lower ribs and these are usually broader and seldom show sulcation. This species is named for Dr. Emil Böse in recognition of his contributions to the Geology of Lower California.» G. DALLAS HANNA, G. D. & LEO GEORGE HERTLEIN, 1927
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«REMARKS: This species may be distinguished from P. bakeri by the right valve being much more convex than the left which is but slightly convex, and by the nondevelopment of the secondary riblets on the primaries of the left valve when the specimen is over 60 mm high.
A very similar species occurs in the late Miocene or Pliocene of Venezuela. (See pI. 7, fig. 2.) This later species may be separated by its more rounded ears and slightly deeper byssal notch.» 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. 60]
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Pecten (Pecten) bösei Hanna and Hertlein; J. W. Durham, 1950, Megascopic paleontology and marine stratigraphy, plate 7, figure 1.
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