Plectris crassesetosa is a species of beetle of the family Scarabaeidae. It is found in Brazil (Amazonas).
Adults reach a length of about 12âÂÂ13 mm. They are blackish-brown and glossy. The clypeus is glabrous except for a few small, erect setae. Likewise, the frons and vertex are covered with thick, short, erect setae. The pronotum and elytra are covered with very thick setae, while bare but regular patches remain on both.