As their name implies, minute tree-fungus beetles are tiny, about 0.5 to 5 mm (0.02 to 0.20 in) long. Their body is short and cylindrical, often convex, sometimes with a smooth coat of fine short hairs, sometimes being covered in long bristly hairs. They are mostly dark brown or blackish. The short antennae consist of 8–10 segments. The pronotum is wider than long and often forming a quite prominent helmet-like structure. The elytra do not taper noticeably over most of their length. The legs are short, the tibiae of the forelegs often bear characteristic extensions at the ends.
Ecology
These beetles usually inhabit Polyporaceae or more rarely Corticiaceae bracket fungi. The larvae as well as the adults burrow inside the fungi, often choosing old specimens or old tissue. The whole development, from egg to adult, often takes as little as two months; some are parthenogenetic. A few species are pests of commercial fungi, as in the case of Cis chinensis, which infests dried fruiting-bodies of Ganoderma lucidum.
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Lopes-Andrade, C. 2008 The first record of Cis chinensis Lawrence from Brazil, with the delimitation of the Cis multidentatus species-group (Coleoptera: Ciidae). Zootaxa, 1755: 35–46.
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Lopes-Andrade, C., Madureira, M. S., Zacaro, A. A. 2002. Delimitation of the Ceracis singularis group (Coleoptera: Tenebrionoidea: Ciidae), with the description of a new Neotropical species. Dugesiana, 9: 59–63.
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