Key to the Rodentia
           
 
 Size very small; dorsal coloration dark gray, undersides only slightly lighter; small lower jaw with stout recurved coronoid process (Fig. 57a)
   
 Size larger; dorsal color grayish or brown, white or much lighter below; coronoid process of lower jaw obsolete, not as above (Fig. 57b)
 
           
Artiodactyla
 - 
Carnivora
 - 
Chiroptera
 - 
Didelphimorphia
 - 
Insectivora
 - 
Lagomorpha
 - 
Rodentia
 - 
Xenarthra
Scientific Names - Common Names