Isonychus caudiculatus is a species of beetle of the family Scarabaeidae. It is found in Brazil (Minas Gerais).
Adults reach a length of about 7 mm. They are reddish-yellow and densely covered with greenish-yellow scales. The antennae are yellowish-red, with a black club. Due to the dense scaling, the paired striae on the elytra are only indistinctly visible. The underside is densely covered with greenish-yellow scales, except for the middle of the abdomen, which is covered with erect yellow hairs.