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Physiographic distribution and conservation of Michoacán herpetofauna Table 6. CBR matrix of herpetofaunal relationships for the five physiographic provinces in Michoacán. N = species in each province; N = species in common between two provinces; N = Coefficients of Biogeographic Resemblance. The formula for this algorithm is CBR = 2C/N1 + N2, where C is the number of species in common to both provinces, N1 is the number of species in the first province, and N2 is the number of species in the second province. COP BTD SMS TVA CEP COP 71 44 44 9 4 BTD 0.52 98 74 21 11 SMS 0.51 0.74 103 29 9 TVA 0.11 0.22 0.29 97 26 CEP 0.08 0.17 0.14 0.41 29 26 of the 29 species found in the Central Plateau also are recorded from the Transverse Volcanic Axis, but because of the disparity in the size of their respective herpetofaunas their CBR value is only 0.41. Nonetheless, this is the Central Plateau’s greatest degree of resemblance with any of the other four provinces. As opposed to species shared between or among physiographic provinces, the distribution of some species is confined to a single province (Table 4), although sometimes these are more broadly distributed outside the state. In the Coastal Plain, the following 22 species are involved: Trachycephalus typhonius Hypopachus ustus Crocodylus acutus Phyllodactylus davisi Phyllodactylus homolepidurus Plestiodon parvulus Geagras redimitus Symphimus leucostomus Coniophanes michoacanensis Coniophanes piceivittis Enulius oligostichus Leptodeira nigrofasciata Leptodeira uribei Pelamis platura Thamnophis proximus Thamnophis validus Porthidium hespere Plestiodon parvulus Chelonia mydas Lepidochelys olivacea Dermochelys coriacea Rhinoclemmys pulcherrima In the Balsas-Tepalcatepec Depression, the following 16 species are confined to this province: Eleutherodactylus maurus Lithobates berlandieri Lithobates magnaocularis Rhinophrynus dorsalis Bipes canaliculatus Ctenosaura clarki Phyllodactylus paucituberculatus Aspidoscelis sacki Imantodes gemmistratus Leptodeira septentrionalis Micrurus laticollaris Rena bressoni Rena humilis Rena maxima Thamnophis postremus Crotalus culminatus The following 14 species are limited to the Sierra Madre del Sur, within the state: Eleutherodactylus modestus Eleutherodactylus rufescens Barisia jonesi Elgaria kingii Sceloporus bulleri Sceloporus insignis Coniophanes sarae Dipsas gaigeae Geophis incomptus Geophis nigrocinctus Geophis pyburni Geophis sieboldi Tropidodipsas annulifera Tropidodipsas fasciata The herpetofauna of the Transverse Volcanic Axis in Michoacán contains the following 47 single-province species (Lithobates catesbeianus, a non-native species, is not listed): Craugastor hobartsmithi Craugastor occidentalis Eleutherodactylus angustidigitorum Hyla plicata Lithobates dunni Lithobates spectabilis Ambystoma amblycephalum Ambystoma andersoni Amphib. Reptile Conserv. | http://amphibian-reptile-conservation.org 146 September 2013 | Volume 7 | Number 1 | e71
Alvarado-Díaz et al. Ambystoma dumerilii Ambystoma ordinarium Ambystoma rivulare Ambystoma velasci Pseudoeurycea bellii Pseudoeurycea leprosa Pseudoeurycea longicauda Abronia deppii Barisia imbricata Barisia rudicollis Gerrhonotus liocephalus Phrynosoma orbiculare Sceloporus aeneus Sceloporus grammicus Plestiodon copei Plestiodon dugesii Conopsis biserialis Conopsis nasus Gyalopion canum Lampropeltis ruthveni Lampropeltis triangulum Tantilla bocourti Tantilla cascadae Diadophis punctatus Geophis bicolor Geophis dugesii Geophis maculiferus Geophis tarascae Rhadinaea laureata Rhadinaea taeniata Micrurus tener Thamnophis melanogaster Thamnophis pulchrilatus Thamnophis scalaris Crotalus aquilus Crotalus molossus Crotalus polystictus Crotalus tancitarensis Crotalus triseriatus Finally, the Central Plateau herpetofauna includes only one species limited to this province, as follows: Adelophis copei In total, of the 212 native species, 100 (47.2%) are confined to a single physiographic province within the state. Organizing these single-province species by their distributional status (Table 7) indicates the following (listed in order of state endemics, country endemics, and non-endemic species): Coastal plain (22 total species) = 1 (4.5%), 10 (45.5%), 11 (50.0%); Balsas-Tepalcate- Pseudoeurycea bellii. Bell’s false brook salamander occurs from southern Tamaulipas and southern Nayarit southward to Tlaxcala and Guerrero, Mexico, with a disjunct population found in east-central Sonora and adjacent Chihuahua. Its EVS has been gauged as 12, placing it in the upper portion of the medium vulnerability category, its status has been judged as Vulnerable by IUCN, and it is regarded as Threatened by SEMARNAT. This individual was found and photographed on Cerro Tancítaro, Michoacán. Photo by Javier Alvarado-Díaz. Amphib. Reptile Conserv. | http://amphibian-reptile-conservation.org 147 September 2013 | Volume 7 | Number 1 | e71
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Taxonomy and conservation of the co
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pectinata (threatened), and Eretmoc
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