OOI 



Plethodontidae 

 (Red-backed salamander) 



Caeciliidae 

 (Caecilian) 



Crossopterygii 

 (Crossopterygians) 



Eryopsidae 

 (Extinct Eryops) 



Figure 267. Some orders and families of amphibians. Probable relationships of the more im- 

 portant living families are indicated by lines; the lines are broken where greatest doubt exists. 

 (Based on diagram by Charles M. Bogert, Curator of Amphibians and Reptiles, American 

 Museum of Natural History; made expressly for this text.) 



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