close-up of neotenic achoque salamander, ambystoma andersoni gills underwater

amphibia achoque ambystoma andersoni ambystomatidae amphibian chordata caudata mexican mexico nature urodela animal anomaly aquatic biodiversity biology closeup critically endangered ecology herpetology macro mole salamander neotenic neoteny newt outdoor paedomorph predator protected threatened underwater wildlife zacapu zoology diving swimming daylight gills detail natural habitat redlist close-up