|Diagnosis||Diagnosis. Cnemidophorus laredoensisis a medium sized lizard (x̅ snout-vent length = 67.9mm, range 58-89 mm) belonging to the sexlineatus group as defined by Duellman and Zweifel (1962). It is distinctive from the other species groups by having three parietals, two frontoparietals, four enlarged supraoculars, slightly enlarged postantebrachials, and the young are completely striped with spots confined to the dark interspaces. Within the sexlineatus species group, C. laredoensis is distinctive from the other species by having a distinct, single, narrow, cream or white-colored vertebral stripe and distinct paravertebral, dorsolateral, and lateral stripes with ai dark green or greenish-brown background color between the stripes. Small faded or indistinct spots are usually found between the lateral and dorsolateral stripes on the posterior one-third to one-half of the body. Similar spots are also occasionally found posteriorly between the paravertebral and dorsolateral stripes. The dorsal surface of the hindlegs has a semi-reticulated pattern of cream-colored irregular lines. The entire venter is immaculately white. The tail is greenish-brown on top and the dorsolateral stripes extend out about one-third the length of the tail. The ventral surface of the tail is light tan. The postantebrachial scales are slightly enlarged. Also no males have been collected (McKinney et al. 1973).|
Morphological Comparisons. Lowe and Wright (1966) proposed that some unisexual Cnemidophorus arose by hybridization between two bisexual species. This hypothesis requires that the supposed parental species must be sympatric or have been sympatric at one time or be parapatric. Only four Cnemidophorus species (C. gularis, C. inornatus, C. septemvittatus, C. sexlineatus) belonging to the sexlineatus species group occur near Laredo, Texas. Only three (C. gularis, C. septemvittatus, and C. sexlineatus) possess morphological and color characteristics that indicate they might be representative parental species. Hence, only these latter three species were examined morphologically in detail. See also Table 2 for comparisons (McKinney et al. 1973).
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