1. A maximum of 15 loci from five genera of caecilians (Amphibia: Gymnophiona or Apoda) were examined. Species include lchthyophis glutinosus, Geotrypetes seraphini, Caecilia occidentalis, Gymnopis multiplicata, and Dermophis mexicanus. 2. The data indicate that [chtkyophis (family Ichthyophiidae) is less closely related than are the other genera (members of the family Caeciliidae). Dermophis a...