The species was described alongside five other Caccothryptus species by Natural History Museum entomologist Keita Matsumoto in 2021, using specimens gathered by Martin J. D. Brendell (curator of the Coleoptera Department of Entomology at the Natural History Museum, London) at Kathmandu, Nepal in 1983.

[2] A group of Caccothryptus specimens were collected in 1983 in Kathmandu, Nepal by Martin J. D. Brendell, curator of Coleoptera Department of Entomology at the Natural History Museum, London.

One male specimen from Kathmandu, found under the bark of a dead tree, was labeled as the holotype for Caccothryptus brendelli.

The beetle's head, smooth and punctured, is slightly retracted into its pronotum, and features eleven-segment antennae.

The apex of C. brendelli's median lobe narrows to a slightly pointed tip along the side.