History of Classification
D. mexicanus was originally classified as Siphonops mexicanus in 1841. It was reclassified as Amphisbaena versatilis in 1850. In 1880, it was first classified by its current name, Dermophis mexicanus. In 1968, it was mistakenly classified as Dermophis eburatus.
Before 1968, all Caecilians were classified in a single family, Caeciliaidae. Three new families were added in 1968 and 1969: Ichthyophiidae, Typhlonectidae, and Scolecomorphidae, which was further divided into Caeciliinae and Dermophiinae, to which D. mexicanus now belongs. In 1980, Dermophiinae was further divided into old world and new world varieties; however, this was reversed in 1989. In 2011, a large scale phylogenetic analysis of amphibians found Caeciliidae paraphyletic. It also merged Caeciliinae and Typhlonectidae. Despite these results, Caeciliidae is still generally considered a family. The NCBI places Dermophis in the family Dermophiidae; however, most other classifications place Dermophis in Caeciliidae.