. Bulletin. Science; Natural history; Natural history. SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 19. Trimorphodon biscutatus lyrophanes from the Sierra Santa Clara. from southeastern California, Arizona, Nevada, and western Utah. This was in contrast to his finding that T. b. vandenburghi possessed an undivided plate in 46 of 49 specimens. Klauber (1940) and all subsequent authors have considered this the single most important difference between these two subspecies. Additional statistically significant differences cited included a lower number of dorsal body blotches and greater numbers o
. Bulletin. Science; Natural history; Natural history. SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. Fig. 19. Trimorphodon biscutatus lyrophanes from the Sierra Santa Clara. from southeastern California, Arizona, Nevada, and western Utah. This was in contrast to his finding that T. b. vandenburghi possessed an undivided plate in 46 of 49 specimens. Klauber (1940) and all subsequent authors have considered this the single most important difference between these two subspecies. Additional statistically significant differences cited included a lower number of dorsal body blotches and greater numbers of supralabials, infralabials, and subcaudals in T. b. lyrophanes. However, the ranges for these scale counts overlap greatly and thus could not be used to identify the Sierra Santa Clara specimen. The Sierra Santa Clara specimen possessed an undivided anal plate, the diag- nostic character of Trimorphodon b. vandenburghi. The distributions of the two taxa have been proposed by Klauber (1940), Gehlbach (1971), and Scott and McDiarmid (1984). Klauber (1940) and Gehlbach (1971) considered all popu- lations south of San Ignacio, BCS to be T. b. lyrophanes and all populations north of El Rosario, BCN to be T. b. vandenburghi. Scott and McDiarmid (1984), however, consider all specimens south of the vicinity of El Rosario (according to their distribution map) to be T. b. lyrophanes. This presumably was based on the examination of additional material between San Ignacio and El Rosario. The individual from the Sierra Santa Clara locality falls within the distribution of T. b. lyrophanes as reported by Scott and McDiarmid (1984), but its undivided anal plate suggests that it may be T. b. vandenburghi. Clearly, suitable characters have not been discovered that allow the reliable diagnosis of individual specimens to a particular subspecies. In addition, the recognition of these two taxonomically distinct forms was first proposed when specimens were unknown between San Ignacio and San Diego
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