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قراءة كتاب Conspecificity of two pocket mice, Perognathus goldmani and P. artus
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Conspecificity of two pocket mice, Perognathus goldmani and P. artus
Los Mochis but not so large as specimens of goldmani from the type locality, which is still farther north. The uninflated mastoidal bullae "tip the balance" slightly in favor of artus to which the specimens from four miles north of Terrero are here referred. The degree of inflation of the mastoidal bullae elsewhere varies geographically. For example, the mastoidal bullae of the 25 specimens of goldmani from two and a half miles north of El Fuerte, Sinaloa, are intermediate in size as between those of goldmani and artus.
Map 1. Geographic distribution of Perognathus goldmani. The black dots are known localities of occurrence.1. P. g. artus
2. P. g. goldmani
The morphological intermediacy of the specimens from four and a half miles southeast of Alamos and of those from four miles north of Terrero, along with the geographic intermediacy of the two localities where the specimens were obtained constitute basis for arranging artus as a subspecies of goldmani that has one page of priority.
Perognathus goldmani goldmani Osgood
Perognathus goldmani Osgood, N. Amer. Fauna, 18:54, September 20, 1900, type from Sinaloa, Sinaloa.
Range.—See map 1.
Measurements.—Average of five topotypes (Osgood, op. cit.:55): total length, 202; tail vertebrae, 112; hind foot, 28; occipitonasal length, 27.7; mastoidal breadth, 14.5; greatest width of interparietal, 7.4.
Records of occurrence (in each state the localities are listed from north to south).—Sinaloa: 2-1/2 mi. N El Fuerte, 25 K. U.; Sinaloa (Osgood, N. Amer. Fauna, 18:55, September 20, 1900); 10 mi. NNW Los Mochis, 18 K. U. Sonora: 1 mi. E Buena Vista, on Río Yaqui Reservoir, 1000 ft., 2 K. U.; Camoa, 7 (U. S. N. M.); Tesia (Burt, Miscl. Publ. Mus. Zool., Univ. Michigan, 39:46, February 15, 1938); Alamos, 7 (U. S. N. M.); 4-1/2 mi. SE Alamos, 1000 ft., 5 K. U.; Chinobampo (Burt, loc. cit.); 3 mi. NNW Bacarachi [= Bacavachi], 2 K. U.
Perognathus goldmani artus Osgood
Perognathus artus Osgood, N. Amer. Fauna, 18:55, September 20, 1900, type from Batopilas, Chihuahua.
Range.—See map 1.
Measurements.—Average of five adult topotypes (Osgood, op. cit.:55, 63): total length, 191; tail vertebrae, 106; hind foot, 24.6; occipitonasal length, 25.4; mastoidal breadth, 12.4; greatest width of interparietal, 7.1.
Remarks.—Considerable individual variation has been noted in each of several populations of Perognathus goldmani artus. For example, in 14 adults from Culiacán, Sinaloa, the variation is 25.0 to 27.9 in occipitonasal length and in mastoidal breadth is 12.6 to 14.0. Ten specimens (83122-83131 Univ. Mich.) labeled as from Carimechi, Río Mayo, Chi[huahua], were recorded by Burt and Hooper (Occas. Papers Mus. Zool., Univ. Michigan, 430:6, May 27, 1941) as from "near Carimechi." They identified the two largest (83130 and 83131) as Perognathus goldmani and the others as