Mexistenasellus is a genus of isopod crustaceans in the family Stenasellidae.

The genus contains eight species,[1] of which 4 are listed as endangered or vulnerable on the IUCN Red List.

Mexistenasellus coahuila lives in Texas and Mexico,[6] while Mexistenasellus floridensis is found in Florida.

[7] The other species are endemic to Mexico.

This isopod-related article is a stub.