Isthmura is a genus of salamanders in the family Plethodontidae. They are endemic to Mexico. The genus, which corresponds to the former "Pseudoeurycea bellii species group", was established in 2015 in order to preserve Ixalotriton and Bolitoglossa while avoiding paraphyly of Pseudoeurycea.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0