Ciidae

Definition

A family of minute beetles (Coleoptera) commonly known as minute tree-fungus beetles. Members are obligate or nearly obligate inhabitants of the fruiting bodies of bracket fungi (Polyporales), where they feed, breed, and complete their entire life cycle. The family is species-rich and globally distributed, with greatest diversity in tropical and warm-temperate regions, though many species extend into boreal zones.

Etymology

From the genus Cis, the type genus, with the family suffix -idae.

Example

Ciidae larvae tunnel through the tough, woody tissue of Ganoderma or Trametes brackets, creating galleries that later serve as pupation chambers; adult beetles are often recovered by mycologists when collecting polypore specimens for herbaria.

Synonyms

• Minute tree-fungus beetles

Related Terms

• Polyporales
• Coleoptera
• mycophagy
• bracket fungi
• saproxylic
• Cis

Usage Notes

The family name Ciidae is often confused with the genus Cis (both pronounced similarly); in formal taxonomy, Ciidae refers to the family, while Cis is one of many genera within it. Ecologists and mycologists frequently encounter these beetles when sampling fungal communities, but they are easily overlooked due to their small size (typically 1–5 mm). The family was historically placed in the heterogeneous group 'Colydiidae,' but modern classification recognizes Ciidae as a distinct lineage within the superfamily Coccinelloidea.