closeup on the critically endangered neotenic, gilled mexican achoque ambystoma andersoni

ambystomatidae paedomorphism biodiversity herpetology critically endangered salamander paedomorph threatened underwater vertebrata vertebrate ambystoma andersoni amphibian protected neotenic detailed amphibia predator wildlife closeup mexican achoque anomaly caudata ecology urodela aquatic biology neoteny outdoor zoology gilled mexico nature animal person single tailed zacapu macro gills mole newt list wild red