Distribution
Central and Northern San Martin, Peru, normally between elevations of 500-1200 meters. Restricted to mountain ranges throughout the Cordillera Oriental near Tarapoto and central Huallaga river valley.

Natural History
This is a montane species that prefers to live alongside small streams and creeks. At lower elevations, these frogs are completely restricted to cool, humid pockets that surround small streams, whereas in the highlands they can be found just about anywhere. Tadpoles are typically deposited in small ditches or backwaters near streams, but rarely in flowing water.

Conservation Status
The population status of this species in the wild varies between morphs. Some, such as the nominal morph, can be found in great numbers over 600 meters elevation. Conversely, the chrome green morph is highly endangered and has very little habitat remaining. In all cases, A. bassleri has a restricted range due to its dependence on cool conditions. Fortunately, smuggling has not been a significant problem in this species. Certain morphs (i.e. chrome green) could not withstand even light collection and would be in grave risk of extirpation of smuggling was to start.

Notes
Sister to A. yoshina.