An ecogeographic analysis of the An ecogeographic analysis of the herpetofauna of the Yucatan Peninsula ecogeographicana00leej Year: 1980 14 MISCELLANEOUS PUBLICATION MUSEUM OF NATURAL HISTORY Snakes ^O^ ^ '^ 11 ( 15 : 16 14 \ 12 1 13 H- â ^ 3 '3- nâI Fig. 5.âCluster analysis of 108 grid squares on the basis of presence or absence of snake 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

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