Eulichadidae

Definition

A family of click beetles (order Coleoptera, superorder Elateriformia) comprising two extant genera with a disjunct distribution: Eulichas, with several dozen species in the Indomalayan realm of Asia, and Stenocolus, represented by a single species in western North America. The family is characterized by aquatic larvae that inhabit clean forest streams and low-elevation rivers, where they feed on decaying plant material, wood particles, or detritus, while adults are terrestrial and occupy riparian vegetation. The larvae of Eulichas occur in sandy sediments, whereas those of Stenocolus are found under rocks and in leaf packs. Adults of Eulichas are attracted to light, but Stenocolus adults are not.

Etymology

From the type genus Eulichas (Greek eu-, 'well' or 'true' + lichas, a proper name) + -idae, the standard family suffix in zoological nomenclature.

Example

Larvae of Eulichas dudgeoni, a species in the family Eulichadidae, were collected from sandy substrates of undisturbed forest streams in Borneo and found to contain wood particles in their digestive tracts, confirming their saprophagous diet.

Related Terms

• Elateriformia
• Coleoptera
• Eulichas
• Stenocolus
• aquatic beetle
• riparian
• saprophagous

Usage Notes

The family exhibits a classic relict distribution pattern with sister taxa separated between Asia and North America. Placement of several Mesozoic fossil genera in Eulichadidae remains disputed. The family is sometimes overlooked in aquatic insect surveys due to its secretive larval habits and relatively low abundance.