Trioserica phetchabun is a species of beetle of the family Scarabaeidae.BioLib It is found in Thailand.

Description Adults reach a length of about 6.8–7.6 mm. They have a yellowish brown, oblong body, with numerous small dark spots. The antennae and ventral surface are yellow, the dorsal surface is dull and the surface is almost glabrous.

Etymology The species name is derived from its occurrence in the Phetchabun province.

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