A small shrew recorded near Mount Pirre in eastern Panama. A museum account describes its black coat and specimens captured beside streams.
Goldman described it as a small black shrew.
This shrew has slender fingers and claws. In the third forefoot digit, the terminal bone supports about half the claw’s length and is proportionally short compared with strongly digging-adapted congeners.
A 2014 study used X-rays of museum skins and measurements from skeletal images to compare limb proportions and structures related to muscle action.
Cryptotis merus ranked toward the terrestrial end of the functional comparison. Its forelimb morphology was interpreted as closer to surface locomotion than to powerful digging. The inference comes from bone shape.
An extinction-risk assessment has not been added yet.
The July 2007 management document for Darién National Park, which includes Cerro Pirre and other recorded localities, identifies resource exploitation and encroachment as threats to the park. It sets out patrols and surveillance against illegal logging and other activities, together with boundary demarcation.