An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 YUCATAN HERPETOFAUNA 11 ^ 9—1 Ih 095 092 087 083 0 78 0 74 0 69 Fig. 3.—Cluster analysis of 108 grid squares on the basis of presence or absence of frog species. Squares clustered at the level of similarity or higher are united, assigned a number, and cir- cumscribed by a dotted line. On the map a solid line encloses major areas of faunal homogeneity. The cophenetic correlation coefficient is west corner. Conspicuous among these are: Agalychnis callidryas, Hyla ehrac- cata,
An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 YUCATAN HERPETOFAUNA 11 ^ 9—1 Ih 095 092 087 083 0 78 0 74 0 69 Fig. 3.—Cluster analysis of 108 grid squares on the basis of presence or absence of frog species. Squares clustered at the level of similarity or higher are united, assigned a number, and cir- cumscribed by a dotted line. On the map a solid line encloses major areas of faunal homogeneity. The cophenetic correlation coefficient is west corner. Conspicuous among these are: Agalychnis callidryas, Hyla ehrac- cata, H. loquax, H. microcephala, H. picta, Anolis tropidonotus, Corytophanes hernandezi, Eumeces sumichrasti, Den- drophidion vinitor, Imantodes cenchoa, Leptophis ahaetulla, and Xenodon rab- docephalus. Still others are restricted to the north end of the peninsula, such as: Bolito- glossa yucatana, Eleutherodactylus yu- catanensis, Kinosternon creaseri, Terra- pene mexicana, Sceloporus cozumelae, Leptotyphlops phenops, Coniophanes meridanus, Imantodes tenuissimus, Pli- ocercus andrewsi, Symphimus mayae, Tantilla cuniculator, and Bothrops yuca- tanicus. Finally there are those species which are pan-peninsular. These include: hep- todactylus labialis, L. melanonotus, Bufo marinus, B. valliceps, Phrynohyas venu- losa, Smilisca baudinii, Hypopachus variolosus, Rana pipiens, Anolis rod- riguezi, A. sericeus, Basiliscus vittatus, Ameiva undulata. Boa constrictor, Coni- ophanes imperialis, Drymarchon corais, Drymobius margaritiferus, Leptodeira frenata, Leptophis mexicanus, Mastigo- dryas melanolomus, Ninia sebae, Spilotes pullatus, Tropidodipsas sartori, and Mi- crurus diastema. Statistical confirmation that the limits of distribution of amphibians and rep- tiles do not fall randomly through the peninsula is presented in Table 2, which compares frequency distributions of numbers of distribution limits per 50 x 50 km grid square with the expected fre- quencies assuming a Poisson distr
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