Paraleptopecten biolleyi (Hertlein & Strong, 1946)
HERTLEIN, L. G. & A. M. STRONG. 1946. Eastern Pacific Expeditions of the New York Zoological Society XXXIV. Mollusks from the west coast of Mexico and central America, Part 3. Zoologica, Scientific Contributions of the New York Zoological Society, 31 (2): 53-76, pl. 1. [p. 60, pl. 1, fig. 6]
1946 Pecten (Leptopecten) velero biolleyi Hertlein & Strong, 1946
L. G. Hertlein & A. M. Strong, 1946, plate 1.
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«Shell small, rather thin, hinge long; color white and brown roughly arranged in concentric bands; anterior ear of right valve with large byssal notch and ctenolium, ornamented by three ribs; ventral margin broadly rounded; left ear large and broadly notched, ornamented by about four ribs; valve ornamented by about 12 to 13 rather high sharply triangular ribs which are separated by considerably wider interspaces, ribs and interspaces with strong, dense, fringing imbricating lamellae; when slightly worn the tops of the ribs are smooth; the ribs near the anterior and posterior margins are somewhat higher than the others and sometimes every third rib or pair of ribs is slightly raised; left valve similar to right except that it lacks the large byssal notch and the right ear is ornamented by about 4 or 5 ribs and the left ear is ornamerited by 5 or 6 ribs; on some left valves every third rib is raised higher than the intervening ones. Length, 6.9 mm.; height, 6.6 mm.
Holotype, right valve, and paratypes (Calif. Acad. Sci. Paleo. Coll.), from Station 203-D-3, dredged in 12 fathoms (22 meters) in Lat. 10°55>45"N., Long. 85°49'0'5" W., Port Parker, Costa Rica, on bottom of sandy mud and crushed shells. Several small specimens were dredged near the same locality at Station 203-D-l. This form is described as a subspecies of Pecten velero Hertlein because occasional left valves have every third rib raised similar to that species. The new subspecies differs from Pecten velero in possessing fewer, stronger ribs, 12 as compared to 16, and in that every third rib is less strongly raised in relation to the others. Pecten velero biolleyi resembles P. bellilamellatus Arnold⁵ a species described as a fossil from the Pliocene of California, but differs in possessing fewer ribs, only 12 or 13 as compared to 15 or 16. Our specimens bear a remarkable resemblance to Arnold’s illustrations of P. bellilamellatus and possibly this new subspecies might be considered to be a living representative of that species. Arnold’s species however, was described as possessing about 16 ribs whereas the present form is constant in its small size and in its ornamentation of 12 or occasionally 13 ribs. Compared to Pecten latiauratus delosi Arnold,⁶ the new subspecies has fewer, wider spaced ribs. This new subspecies is named for Paul Biolley, former professor of Natural History at San Jose de Costa Rica.» ⁵ Pecten (Chlamys) bellilamellatus Arnold, U. S. Geol. Surv., Prof. Paper 47, 1906, p. 108, pl. 41, figs. 6, 6a, 7, 7a. ‘‘San Diego formation (Pliocene), Pacific Beach, San Diego County, Cal.”
⁶ Pecten (Chlamys) latiauritus Conrad var. delosi Arnold, U. S. Geol. Surv., Prof. Paper 47, 1906, p. 130, pl. 46, figs. 9, 9a, 10, 10a. “San Pedro formation (lower portion), Pleistocene, Deadman Island, near San Pedro, Los Angeles County, Cal.” Also Recent. LEO GEORGE HERTLEIN & ARCHIBALD MCCLURE STRONG, 1946
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«Paraleptopecten biolleyi (Hertlein & Strong, 1946). Type locality: 10°55'45"N, 85°49'05"W, Port Parker, Costa Rica, 22 m. Geographic range: Punta Abreojos, western Baja California and Coronados Islands, Gulf of California southward to Ecuador (Grau, 1959: 116). Age: known only from extant specimens. Habitat: normal marine shallow shelf, 7 to ca. 200 m, sand or mud bottoms (Grau, 1959: 116).»
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, pls. 1-18. [p. 139]
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