One of Champion's specimens was distinguished from its initial classification of C. ripicola due to distinct genital structures.

[2] A group of Caccothryptus specimens were collected in 1953 by forester Harry George Champion in the Haldwani division of the Kumaon Himalayas, India.

In 2021, Natural History Museum entomologist Keita Matsumoto identified a number of distinct species from these specimens.

C. tardarsauceae has an elongated oval body, brown in colour except for reddish tibia and long, white setae, which are distributed across both the upper and lower sides of the beetle.

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