Cyclopecten pernomus (Hertlein, 1935)
HERTLEIN, L. G. 1935. The Templeton Crocker Expedition in the Galapagos Islands. The recent Pectinidae. Proceedings of the California Academy of Sciences [4th Series], 21 (25): 301-328, pls. 18-19 [p. 320, pl. 18, p. 11-13]
1908 Pecten (Cyclopecten) rotundus Dall, 1908
1935 Pecten (Cyclopecten) pernomus Hertlein, 1935
1935 Pecten (Cyclopecten) pernomus Hertlein, 1935
L. G. Hertlein, 1935, plate 18.
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«Pecten (Cyclopecten) rotundus Dall, Bull. Mus, Comp. Zool., vol. 43, no. 6, 1908, p. 404. "Panama Bay, in 29½ fathoms; also at station 2784, in 194 fathoms, mud bottom temperature 51°.9 F." "A single valve from neat the Straits of Magellan, apparently the same species." — Zetek, Los Mol. Republ. Panama. Revista Nueva, nos. 1 and 2, 1918, p. 39. Panama.
Not Pecten rotundus v. Hagenow, Neues Jahrb. f. Min., 1842, p. 554. "Rügen' schen Kreide." Range: Panama Bay (Dall). (?) Straits of Magellan (Dall).
This species is not present in the Templeton Crocker Expedition collection. The name Pecten rotundus was used by von Hagenow much earlier than by Dall, and the name pernomus is here proposed for the West American species.
According to Townsend, [52] No. 2799 U. S. B. F. Sta., is given as Lat. 8° 44' 00" N., Long. 79° 09' 00o W., at a depth of 29.5 fathoms, green mud, surface temperatures 75° F., March 6, 1888, and Dall in his original record of P. rotundus gave the locality as . . . "in Panama Bay, in 29½ fathoms." The specimens illustrated on plate 18, figures 11, 12, 13, are considered in the present paper to be syntypes of Pecten rotundus Dall, due to the fact that the altitude given in the original description is 3 mm., and the altitude of the specimens illustrated in figures 11 and 13 are both 3 mm. From the present information it is not clear which specimen, if any, was selected as holotype by Dall. The photographs of the "types" of P. rotundus, were received from the U. S. National Museum, through the kindness of Dr. A. Wetmore. Additional collections may show that this is the young of P. cocosensis Dall, but for the present it is regarded as a separate species.» [52] Townsed, C. H., Dredging and other records of the United States Fish Conmission Steamer Albatross with bibliography relative to the work of the vessel, in Rept. U. S, Commission of Fish and Fisheries, pt. 26. 1900 [issued 1901], p. 404.
LEO GEORGE HERTLEIN, 1935
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«Additional descriptive notes: The right vake is slightly smaller than the left. Its anterior auricle has concentric as well as radial striae; its posterior auricle is not "smooth," having 7 to 11 fairly prominent radial threads and finer concentric threads. The posterior auricle of the left valve is not "nearly smooth," having both fine radial and finer concentric threads. On about half of the hundreds of left valves examined there were gray-brown, yellow-brown, red-brown or deep brown areas, irregular and varying in size; the right valves were all white. Specimens measuring 10 mm in altitude were taken at Hancock station BS2130, Pond Island, northern Gulf of California, in 62-85 fathoms; the largest specimens previously recorded were 7 mm in altitude.
Geographical range: Cedros Island, western Lower California, Mexico, and Angel de la Guarda Island, northern Gulf of California, to La Libertad, Ecuador. Also Guadalupe Island, Mexico (180 miles west of central Lower California) and the Galapagos Islands. DaIl's "single valve from near the Straits of Magellan, apparently the same species,..." cannot be accepted as conclusive evidence that Cyclopecten pernomus actually lives that far south. Previous records indicated San Jose Island as the northern limit in the Gulf of California and Panama Bay as the southern limit in the Pacific. Hancock station BS2037, north of Angel de la Guarda Island, increased the northern range in the Gulf by about 330 miles; Hancock station BS504, La Libertad, Ecuador, increased the southern range by about 500 miles; Hamcock station 155-34 established the first record from the Galapagos Islands. Geochronologial range: Reported only from the Recent. Bathymetric range: Recorded in 1 to 194 fathoms. Durham (1942, p. 121) reported this species at E. W. Scripps station A3599, Sal Si Puedes Channel, Gulf of Califomia (between Lower California and the San Lorenzo Islands), in 860 fathoms, "... in the mud, on a mushroom anchor." Although he did not say whether the specimens were living or dead, it is almost certain that they were not living at that great depth. Ecological data: Usually found in mud bottoms, occasionally sandy mud or sand: sometimes associated with eel grass or weed.» GRAU, G. 1959. Pectinidae of the eastern Pacific. Allan Hancock Pacific Expeditions, 23: viii, 308 p., pls. 1-57. University of Southern California Press. Los Angeles, California. [p. 33, 34]
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CycIopecten pernomus (Hertlein) 1935; G. Grau, 1959, Pectinidae of the eastern Pacific, plate 11.
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