Euvola Dall, 1898
DALL, W. H. 1898. Contributions to the Tertiary fauna of Florida. Silex Beds of Tampa and the Pliocene Beds of the Caloosahatchie River. Part IV. I. Prionodesmacea: Nucula to Julia. 2. Teleodesmacea: Teredo to Ervilia. Transactions of the Wagner Free Institute of Science of Philadelphia, 3 (4): viii, 571-947 p., pls. 23-35. [p. 694]
«Section Euvola Dall, 1897. Type P. ziczac L.
Left valve extremely inflated, surface polished, ribs moderate or obsolete, without radial striation, concentric sculpture inconspicuous; right valve with or without conspicuous radial and concentric sculpture, flat or concave.»
WILLIAM HEALEY DALL, 1898
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Euvola ziczac (Linnaeus, 1758); B. K. Raines & G. T. Poppe, 2006, A Conchological Iconography, The Family Pectinidae, plate 118.
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T. R. Waller, 2011, Neogene Paleontology of the Northern Dominican Republic, plate 13. Euvola gurabensis n. sp., figures 4-10; Euvola jamaicensis n. n., figures 11-14.
T. R. Waller, 2011, Neogene Paleontology of the Northern Dominican Republic, plate 14. Euvola jamaicensis n. n., figures 1, 2; Euvola soror (Gabb, 1873), figures 3-13.
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«Pecten (Euvola) Dall, 1898: 694, proposed as a section of Pecten (Pecten).
Type species.-- Ostrea ziczac Linnaeus, 1758, by original designation (Dall, 1898: 694), Recent, tropical and warmtemperate western Atlantic.
Original diagnosis.— "Left [sic, right] valve extremely inflated, surface polished, ribs moderate or obsolete, without radial striation, concentric sculpture inconspicuous; right [sic, left] valve with or without conspicuous radial and concentric sculpture, fl at or concave" (Dall, 1898: 694-695).
Emended diagnosis.— Pectininae with RV moderately to deeply convex, LV flat or concave, radial ribs variable in strength, left auricles with 1-3 incipient to well-developed radial costae near dorsal margin; hinge dentition of RV dominated by dorsal teeth, prominent intermediate teeth absent, resilial teeth variably developed, commonly weak or absent.
Remarks.— Dall's (1898) concept of the "section" Euvola is that it consists of species of Pecten having obsolete or absent ribbing on the right valve as well as lacking commarginal lirae on that valve. Woodring (1925: 63) added to this concept by noting that Pecten (Euvola) differs from Pecten s. s. in having "only one pair of cardinal crura." Waller (1991: 38; 2006a: 25; 2007: 934) recognized that the differences between European Pecten (including Oppenheimopecten von Teppner, 1922, as a junior synonym) and American Euvola allow the recognition of two independent clades that have been separate at least since the middle Miocene, and in a review of the phylogeny of Euvola (Waller, 2007) elevated Euvola to genus rank. In addition to the differences in dentition (dorsal teeth of right valve dominant and intermediate teeth absent or nearly so in Euvola, intermediate teeth present and commonly multiple in Pecten), the two clades differ in the distribution of radial costae on left auricles, commonly only 2 or 3 limited to the dorsal half of the left auricles in Euvola but more numerous and distributed over most of the auricular surfaces in Pecten. The presence or absence of commarginal lamellae on the right valve is of use only at the species level. A vexing problem with the species-level taxonomy of Euvola is that many fossil species have been described inadequately, in some cases on the basis of only a single valve and with little attention to morphological variation.
Geographic range.— Presently ranging from North Carolina to Brazil and Bermuda and throughout the Gulf of Mexico and Caribbean on the eastern side of the Americas; from middle California to Peru and out to the Galapagos Islands on the western side, on sandy to muddy bottoms from shallow subtidal depths to ca. 200 m.
Stratigraphic range.— Middle Miocene to Recent.»
WALLER, T. R. 2011. Neogene Paleontology of the Northern Dominican Republic. 24. Propeamussiidae and Pectinidae (Mollusca: Bivalvia: Pectinoidea) of the Cibao Valley. Bulletins of American Paleontology, 381: 1-197 [p. 100]
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