Batequeus Squires and Demetrion, 1990
SQUIRES, R. L. & R. DEMETRION. 1990. New Eocene marine bivalves from Baja California Sur, Mexico. Journal of Paleontology, 64 (3): 382-391, figs. 1-4.
Order PTERIOIDA Newell, 1965
Family PECTINIDAE Rafinesque, 1815 Genus BATEQUEUS n. gen. Type species.— Batequeus mezquitalensis n. sp., the sole included species
Diagnosis.— A medium-sized pectinid, slightly longer than high, with equally low-convex values, short byssal notch, anterior auricles smaller than the posterior ones, left valve with numerous very closely spaced radial riblets that show the imbricated growth lines very well, right valve with about 30 low flat-topped radial ribs that can be grooved, and intercalary ribs (usually single ones) on both valves.
Remarks.— Of the groups of family Pectinidae Rafinesque, 1815, listed by Hertlein (1969), Batequeus n. gen. has more in common with the Chlamys Group than any other. Batequeus is interpreted to be only distantly related to the Chlamys Group because true Chlamys Roding, 1798, and related genera have a convex left valve and a less convex right valve. Superficially, the new genus resembles the Pecten Group of Hertlein (1969), but true Pecten Müller, 1776, and related forms have broad, flat, relatively unornamented ribs (not like Batequeus) and their byssal.
Etymology.— The new genus is named for the Bateque Formation.
RICHARD LANE SQUIRES & ROBERT DEMETRION, 1990
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Batequeus mezquitalensis n. gen. and sp.; R. L. Squires & R. Demetrion, 1990, New Eocene marine bivalves from Baja California Sur, Mexico, figures 2.1-2.5.
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