Pachyderoserica is a genus of beetles in the family Scarabaeidae. It is monotypic, being represented by the single species, Pachyderoserica crassicollis, which is found in southern India (Madura, Shembaganur).
Adults reach a length of about 6 mm. They are black or blackish-brown and silky. The elytra have a longitudinal band. The head is moderately densely punctate and sparingly yellowish-setose. The antennae are yellow.