The adult is less than a centimeter in length with pale-brown forewings, orange pronotum ("neck plate"), and dark-brown head.

[1][2] The genus Sclerotia was erected in the same paper that described S. fui; it contains six other species, all from southeastern Asia.

Fu and colleagues had reported on this species and its larva in several publications since 2005, where they misidentified it as Luciola substriata.

[1] The upper sides are pale brown, and the rear tips of the elytra (forewings) are weakly black.

[1] In June 2023, China's National Forestry and Grassland Administration included the species in its "List of Terrestrial Wild Animals of Important Ecological, Scientific and Social Value"; it is therefore recognised as being in need of protection.