Cis boleti
Cis boleti is a species of beetle in family Ciidae. "Cis boleti" is a tiny beetle (2,8–4 mm in length) uniformly brown beetle which lives in tree fungus. For instance, within the fruit bodies of "Piptoporus betulinus" and "Trametes". It is one of many very similar species, which are very difficult to identify and separated mostly by differences in the male genitalia.. It is found in Europe and East across the Palearctic to Japan.