This species shares fully striate elytra and transversely-lined elytral microsculpture with Mecyclothorax fuscus Perrault. Both species are also characterized by presence of only the anterior dorsal elytral seta and only the apical elytral seta; setal formula 2111. However, this species differs by: 1, the very narrow elytra with subparallel lateral margins versus more ovoid elytra in Mecyclothorax fuscus; and 2, the laterally extended humeri resulting in a MEW/HuW ratio of 1.89 in this species, versus MEW/HuW = 1.97 for Mecyclothorax fuscus. The pronotal hind angles are also profoundly margined in this species , with the lateral and basal marginal beads defining a U-shaped pronotal laterobasal depression. Conversely, the hind angles are upraised but without a distinctly beaded margin in Mecyclothorax fuscus. Standardized body length is 4.2 mm for this species versus 4.0 mm for Mecyclothorax fuscus. (Liebherr, 2012).
The lone specimen of this species was found in the highest, wettest rain forest sampled—1080–1100 m elevation—during a tropical rainstorm, the use of a hand-held pyrethrin fog canister over a beating sheet the sole collecting method of any utility under those conditions. That the beetle plus those of Mecyclothorax tutei and Mecyclothorax pirihao were found in dead fern tangles during this storm suggests that the beetles had moved into such tight quarters due to the rain. Neither Mecyclothorax tutei nor Mecyclothorax toretore were collected during drier conditions in this elevational band of forest even though extensive beating of vegetation had been undertaken over the course of three days. (Liebherr, 2012).