FREE BOOKS

Author's List




PREV.   NEXT  
|<   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149  
150   151   152   153   154   155   156   157   158   159   160   161   162   163   164   165   166   167   >>  
-oak forest at an elevation of 2100 meters. ~Crotalus triseriatus aquilus~ Klauber _Crotalus triseriatus aquilus_ Klauber, Bull. Zool. Soc. San Diego, 26:24, August 8, 1952.--Alvarez, San Luis Potosi, Mexico. Morelia (10); Tacicuaro (2). I am following Klauber (1952) in assigning some of the specimens of this species from Michoacan to the subspecies _aquilus_ and others to _C. t. triseriatus_. The distinguishing characters of these subspecies are given by Klauber (1952:28). On the basis of the few localities from which the species is known in Michoacan it seems as though _C. t. aquilus_ inhabits the open grassy areas on the Mexican Plateau and the associated open pine-oak or oak-bunch grass habitats to the north and east of the Cordillera Volcanica. _Crotalus triseriatus aquilus_ has been collected at elevations from 1600 to 2000 meters in Michoacan. ~Crotalus triseriatus triseriatus~ (Wagler) _Uropsophus triseriatus_ Wagler, Natuerliches System der Amphibien, p. 176, 1830.--Mexico. (Probably Mexico City.) _Crotalus triseriatus triseriatus_, Klauber, Bull. Zool. Soc. San Diego, 26:19, August 8, 1952. Cerro Tancitaro (36); Opopeo; Patzcuaro. This small rattlesnake inhabits rocky areas in pine and pine-oak forests above 1600 meters in the Cordillera Volcanica; it has been collected at 3270 meters on Cerro Tancitaro. The series reported by Schmidt and Shannon (1947:84) is a mixture of specimens of _Crotalus triseriatus_ and _Crotalus pusillus_. The two species are found together on Cerro Tancitaro, but only _Crotalus pusillus_ inhabits the coniferous forests of the Sierra de Coalcoman. Klauber (1952:30) stated that despite the proximity of _Crotalus triseriatus triseriatus_ and _Crotalus triseriatus aquilus_ in Michoacan, there is no evidence of intergradation. He went on to suggest that additional material might show that the two named populations actually are distinct species. The specimens that have been studied since Klauber's investigations also show no evidence of intergradation, but there still is no known sympatry of the populations. The small montane rattlesnakes belonging to the species _C. pricei_, _C. pusillus_, and _C. triseriatus_ present a problem in systematics and distribution worthy of intensive investigation. A knowledge of the distribution and relationships of the various populations of these snakes, together with other species also
PREV.   NEXT  
|<   125   126   127   128   129   130   131   132   133   134   135   136   137   138   139   140   141   142   143   144   145   146   147   148   149  
150   151   152   153   154   155   156   157   158   159   160   161   162   163   164   165   166   167   >>  



Top keywords:
triseriatus
 

Crotalus

 

Klauber

 

aquilus

 

species

 
meters
 
Michoacan
 

Mexico

 
Tancitaro
 

pusillus


populations

 

inhabits

 
specimens
 

Wagler

 
collected
 

Volcanica

 
evidence
 
intergradation
 

forests

 

Cordillera


August

 

distribution

 

subspecies

 

coniferous

 

mixture

 

Schmidt

 

Shannon

 

Sierra

 

stated

 

Coalcoman


proximity

 
systematics
 

worthy

 

intensive

 

problem

 
present
 

belonging

 
pricei
 

investigation

 
snakes

knowledge
 

relationships

 
rattlesnakes
 
montane
 

material

 

additional

 
suggest
 

distinct

 
sympatry
 

investigations