Euvola refugioensis (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. 7, pl. 1, fig 2]
1925 Pecten (Pecten) refugioensis Hertlein, 1925
L. G. Hertlein, 1925, plate 1.
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«Shell of medium size. Right valve practically smooth, ornamented, however, by fine concentric lines of growth, and close to the beaks also by fine, faint, radiating ribs which, however, disappear at the umbo; ventral margin smooth ; interior of the shell ornamented by about 19 dichotomous ribs; ears about equal and concentrically sculptured; a slight groove showing where the ears meet the margins of the shell; a slight byssal notch present on the anterior ear. Left valve fairly smooth, ornamented interiorly much as right, a depressed area which is lower than the margins extends from the beaks to about onehalf the height of the shell; ears slightly concave, ornamented by concentric lines of growth. Altitude 56 mm.; longitude 57 mm.; diameter of right valve approximately 14 mm.; apical angle of right valve approximately 97°.
Type: Right valve. No. 49 (L.S.J.U. type collection), from Loc. 50 (L.S.J.U.), Rancho Refugio, north of San Jose del Cabo, Lower California; Paratypes: No. 50 (L.S.J.U. collection), and Nos. 1764, 1765, 1766 (C.A.S. collection), C. R. Swarts collector; Upper Miocene or Lower Pliocene. This species also occurs at Loc. 44 (L.S.J.U.), from Arroyo Fortuna, north of San Jose del Cabo, Lower California; C. R. Swarts collector; Upper Miocene or Lower Pliocene. Pecten refugioensis appears to be a step between the sections Amusium and Pecten s. str. It has, in general, the shape of a Pecten s. str. and the concentric sculpture, ears and ribs are suggestive of an Amusium. It differs from P. keepi Arnold by showing scarcely any ribs on the exterior of the shell, and by its somewhat different shape. P. refugioensis differs from P. revolutus Mich., from the Miocene of Italy in having a smaller apical angle, a flatter shell, and differently shaped ears.» LEO GEORGE HERTLEIN, 1925
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«DESCRIPCION.— La concha es grande, circular. La valva derecha es convexa, equilateral. Presenta una ornamentación de 20 costillas radiales visibles únicamente en la región umbonal, las cuales desaparecen en la región ventral que es casi lisa, toda la superficie presenta líneas de crecimiento. El interior de la valva presenta 20 costillas dicotómicas. Las aurículas son del mismo tamaño y con una ornamentación de líneas concéntricas finas. La valva izquierda es plana y presenta una ornamentación similar a la derecha, sólo que las costillas están máa marcadas, lo mismo que las líneas de crecimiento, el interior de la valva presenta las costillas dicotómicas; las aurículas son iguales a las de valva derecha. La crura cardinal se extiende a cada lado de la foseta ligamentaria.»
QUIROZ-BARROSO, S. A. & M. C. PERRILLIAT. 1989. Pectínidos del Plioceno del área de Santa Rosalía, Baja California Sur. Paleontología Mexicana, 53: 80 p., pls. 1-20. [p. 22]
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Pecten (Euvola) refugioensis Hertlein; S. A. Quiroz-Barroso & M. C. Perrilliat, 1989, Pectínidos del Plioceno del área de Santa Rosalía, Baja California Sur, plate 10, figures 3, 4.
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«TYPE LOCALITY. "Rancho Refugio, north of San Jose del Cabo, Lower California." "Upper Miocene or Lower Pliocene."
RANGE. Middle Pliocene.
OCCURRENCE IN BAJA CALIFORNIA. Localities 38849; 39411; 39412 (CAS), Rancho El Refugio; Locality 795 (CAS), Punta Santa Antonita.
COMMENTS. The present collection, assembled from three localities, contains about 25 valves, mostly left ones, in various degrees of preservation. The largest is a left valve collected by Walter Heyneman from Locality 38849 (CAS), which is 88 mm. high and 95 mm. long (slightly imperfect on one end). The smallest is a left valve 29 mm. high and 27.6 mm. long. The largest right valve in the collection is a fragment 75 mm. high.
The shell of this species differs from that of Pecten (Euvola) keepi Arnold usually in the lack of radial ribbing on the ventral half of the valves or if ribbing is present it is much more weakly developed.» HERTLEIN, L. G. 1966. Pliocene fossils from Rancho El Refugio, Baja California, and Cerralvo Island, Mexico. Proceedings of the California Academy of Sciences [4th Series], 30 (14): 265-284, text figs. 1-17. [p. 274]
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Pecten (Euvola) refugioensis Hertlein; L. G. Hertlein, 1966, Pliocene fossils from Rancho El Refugio, Baja California, and Cerralvo Island, Mexico, figures 16, 17.
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