. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. A. RIO GRANDE DO SUL ^] ARGENT I NT A & 60 o URUGUAY 56. 32- 300 KM 52 48 Figure 9. Map showing distribution of P. williamsi (A), P. geoffroanus (•) and P. hilarii (O)- Geographic ranges of the latter two species only partially shown. Stippled areas correspond approximately to elevations greater than 500 m. feature in itself is not diagnostic for P. williamsi. The black head and neck bands of P. geoffroanus and tuberosus are almost always
. Advances in herpetology and evolutionary biology : essays in honor of Ernest E. Williams. Williams, Ernest E. (Ernest Edward); Herpetology; Evolution. A. RIO GRANDE DO SUL ^] ARGENT I NT A & 60 o URUGUAY 56. 32- 300 KM 52 48 Figure 9. Map showing distribution of P. williamsi (A), P. geoffroanus (•) and P. hilarii (O)- Geographic ranges of the latter two species only partially shown. Stippled areas correspond approximately to elevations greater than 500 m. feature in itself is not diagnostic for P. williamsi. The black head and neck bands of P. geoffroanus and tuberosus are almost always relatively thin and usually confluent in several places. Some populations have very thin bands, others somewhat thicker ones, but none are as prominent as in P. williamsi. Though occasionally separated from each other, the facial bands of P. geoffroanus and tuberosus usually connect broadly either in front of the tympanum (intermediate and lower bands connecting), behind the tympanum (upper and intermediate bands connecting) or at several places along their course. Many populations have only two bands plus irregular ver- miculations. A separate ventral horse- shoe band is usually not present, though some specimens of one population of P. geoffroanus from eastern coastal Brazil occasionally exhibit this character as well. Based on external morphology alone it would be difficult to determine whether P. williamsi is distinct from other P. geoffroanus and P. tuberosus at a specific or subspecific level. Though sympatric with P. hilarii, it is allopatric with respect to P. geoffroanus, the closest known. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Williams, Ernest E. (Ernest Edward); Rhodin, Anders G. J; Miyata, Kenneth; Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : Museum of Compara
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Keywords: ., bookauthorharvarduniver, bookcentury1900, booksubjectherpetology
