Euvola hartmanni (Hertlein, 1925)
HERTLEIN, L. G. 1925. Pectens from the Tertiary of Lower California. Proceedings of the California Academy of Sciences [4th Series], 14 (1): 1-35, pls. 1-6. [p. 8, pl. 1, figs. 4, 6]
1925 Pecten (Pecten) hartmanni Hertlein, 1925
L. G. Hertlein 1925, plate 1.
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«Right valve excessively arched, ornamented by about 16 or 17 rounded radiating ribs which become flattened toward the ventral margin of the shell; anterior and posterior margins highly arcuate, smooth except for faint lines of growth; ears somewhat convex and turned up slightly at the ends, the anterior sculptured by about four poorly defined radiating riblets which are crossed by concentric incremental lines, and cut by a slight byssal notch; left ear with a few faint radial riblets and slight concentric striae. Altitude 75 mm.; longitude 65 mm.; diameter of right valve approximately 30 mm.; apical angle of right valve approximately 88º.
Type: Right valve, No. 48 (L.S.J.U. type collection), from Loc. 54 (L.S.J.U.), Arroyo Mesquital, Lower California, above the yellow silts which are well exposed in this arroyo; C. R. Swarts and T. J. Cullen collectors; Lower Pliocene? Pecten hartmanni differs from P. hemphillii Dall in possessing a more highly arched right valve and in the shape of the ears, which in the present species are somewhat more concave. It differs from P. cataractes Dall in having fewer ribs, and in that the margins of the shell descend abruptly rather than expanding laterally, as in the case in Dall's species, and also in P. vogdesi Arnold. This species is named in honor of Mr. A. Hartmann, whose work in Lower California has added to the knowledge of that region.» LEO GEORGE HERTLEIN, 1925
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