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قراءة كتاب A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México
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A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México
southward to Jalisco) has been reviewed in detail by Zweifel (1959, Bull. Amer. Mus. Nat. Hist, 117 (2):57-116), who stated that the use of the specific name sacki for the western populations rests upon a reasonable, but as yet unproved, assumption that intergradation occurs. Although Zweifel examined specimens of the nominal subspecies from the upper Balsas Basin, he did not study specimens from the intervening area—the Tepalcatepec Valley in Michoacán.
Field studies and the examination of large series of preserved specimens of Cnemidophorus from the Tepalcatepec Valley show the presence of Cnemidophorus sacki in the region between the ranges of C. sacki sacki in the upper Balsas Basin and C. sacki occidentalis in Jalisco and southern Nayarit. Furthermore, the populations of sacki inhabiting the Tepalcatepec Valley have characters of scutellation and coloration that distinguish them from other described subspecies of sacki. In recognition of the important contributions to the systematics of the genus Cnemidophorus made by Dr. Richard G. Zweifel, I propose that the subspecies of Cnemidophorus sacki in the Tepalcatepec Valley be named as follows:
Holotype.—University of Michigan Museum of Zoology No. 119542, from Capirio, Michoacán, México (185 meters), an adult male, one of a series collected on June 13, 1958, by William E. Duellman, Jerome B. Tulecke, and John Wellman. Original number WED 12310.
Paratopotypes.—UMMZ Nos. 119536-119541 and 119543-119550.
Diagnosis.—A race of Cnemidophorus sacki characterized by large size (more than 130 mm. snout-vent length in males), approximately 106 dorsal granules around the midbody, about 41 femoral pores, and a dorsal color-pattern in adult males consisting of lateral and dorsolateral rows of spots, paravertebral rows fused with middorsal light green area at least anteriorly, and pink throat having a median light blue spot or transverse band.
Description of Holotype.—Snout-vent length, 128 mm.; tail length, 252 mm.; tail/body ratio, 1.97; scutellation typical of sacki—four supraoculars, enlarged postantebrachials, and enlarged mesoptychials; 107 granules around midbody (excluding enlarged ventrals); 45 femoral pores; three enlarged preanal scales; supraorbital semicircle-series extending anteriorly to posterior edge of frontal (Fig. 1).
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Fig. 1. Top view of the head of the holotype of Cnemidophorus sacki zweifeli (UMMZ 119542) showing scutellation.
Top of head and nape dusty brown; tip of rostral and lateral edges of superciliaries dark cream-color; upper labials and sides of head anterior to eyes cream-color, mottled with blue; lower labials and postocular region pale blue; mental, postmental, and sublabials cream-color. Upper surfaces of forelimbs dull bluish gray, spotted with pale greenish yellow; dorsal surfaces of proximal one-fourth of tail light brownish gray turning to pale orange-brown posteriorly; lateral surfaces of tail bluish gray