Eucnemidae

Definition

A family of elateroid beetles (order Coleoptera, superfamily Elateroidea) commonly known as false click beetles. Adults are typically small to medium-sized with a compact body form and often possess reduced or modified hind wings that prevent the characteristic clicking mechanism found in true click beetles (Elateridae). Larvae are predominantly saproxylic, developing in decaying wood, leaf litter, or soil, where they feed on fungal hyphae or decaying plant matter. The family comprises approximately 1,700 described species in eight subfamilies, distributed worldwide but most diverse in tropical and temperate forest ecosystems.

Etymology

From the type genus Eucnemis (Greek eu- 'true, good' + knēmis 'leg, greave') + -idae (family suffix)

Example

Larvae of the eucnemid genus Fornax are frequently encountered in soft, white-rotted hardwood logs during forest floor surveys, where their elongate, legless form distinguishes them from the more active, thoracic-legged larvae of true click beetles.

Synonyms

• False click beetles

Related Terms

• Elateridae
• Elateroidea
• Coleoptera
• saproxylic
• click mechanism
• Elateriformia

Usage Notes

Distinguished from the true click beetles (Elateridae) by the structure of the prosternal process and mesosternal cavity, which lacks the clicking articulation; adults often fall feign death rather than 'click' when disturbed. The family has undergone significant taxonomic revision, with many genera historically placed in Melasidae or other families now subsumed within Eucnemidae.