Derodontidae

Definition

A family of small polyphagan beetles (Coleoptera), sole family of the superfamily Derodontoidea, commonly called tooth-necked fungus beetles. Adults are 2–6 mm in length and typically possess spiny lateral margins on the pronotum (the "tooth-necked" trait), though this is secondarily lost in Laricobius. Unusual among beetles, Derodontidae retain two ocelli on the vertex. Larvae and adults feed on fungal hyphae and spores, with some species associated with coniferous forests and economically important as predators of adelgid pests.

Etymology

From the type genus Derodontus (Greek deros, 'neck' + odontos, 'tooth') + family suffix -idae, referring to the toothed pronotal margins characteristic of most species.

Example

Laricobius nigrinus (Derodontidae: Laricobinae) is a specialist predator of hemlock woolly adelgids (Adelges tsugae) and has been introduced to eastern North America as a biological control agent.

Synonyms

• tooth-necked fungus beetles

Related Terms

• Coleoptera
• Derodontoidea
• Laricobius
• ocellus
• pronotum
• Polyphaga
• adelgid
• Biological control

Usage Notes

The family is morphologically distinctive among small Coleoptera due to the combination of pronotal dentition and paired ocelli; these traits facilitate field identification. The superfamily Derodontoidea is sometimes subsumed within Bostrichoidea in broader classifications, though current molecular phylogenetics generally supports its monophyly. The three subfamilies (Derodontinae, Laricobinae, Peltasticinae) differ in pronotal armature and ecological associations: Laricobinae are primarily conifer specialists, while Derodontinae and Peltasticinae are more broadly distributed in decaying wood and fungal habitats.