Gastroserica mausonensisGastroserica mausonensis is a species of beetle of the family Scarabaeidae. It is found in Vietnam.DescriptionAdults reach a length of about 6.8 mm. They have a dark chestnut brown, elongate-oval body, with the legs and underside somewhat lighter. They are nearly glabrous, except for some setae on the elytra and along the margins of the pronotum and the elytra.