Lasioserica siyuanae is a species of beetle of the family Scarabaeidae. It is found in China (Guangdong).
Adults reach a length of about 6.2âÂÂ7.9 mm. They have an oblong body. The dorsal surface is dark brown, dull and full of hairs. The pronotum and head have a greenish shine and there are white setae on the elytra. The antennae are yellowish brown.
The species is named after its collector, Ms. Xu Siyuan.