Key to the Rodentia
           
 
 Entire body and tail grayish brown, appearing mottled; anterior margin of alveolar border steeply and abruptly joins diastema (Fig. 35a)
   
 Color not as above; anterior margin of alveolar border curves gradually to meet diastema (Fig. 35b)
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names