Euchirinae

Definition

A subfamily of scarab beetles (Scarabaeidae) in the superfamily Scarabaeoidea, commonly called the long-armed scarabs. Males are distinguished by markedly elongated forelegs bearing fixed median and apical spines, while females possess a movable terminal spine on the foreleg. The subfamily is notable among scarabs for this extreme sexual dimorphism in leg morphology.

Etymology

From Greek euchiros (well-handed or having beautiful hands), referring to the distinctive forelegs.

Example

Male Euchirus longimanus, a Southeast Asian species in Euchirinae, use their elongated, spined forelegs in combat and mate-guarding, while the shorter-legged females excavate soil for oviposition.

Synonyms

• long-armed scarabs

Related Terms

• Scarabaeidae
• Scarabaeoidea
• Sexual dimorphism
• foreleg
• spine
• Cetoniinae
• Dynastinae

Usage Notes

The common name 'long-armed scarabs' refers specifically to male morphology; females lack the exaggerated foreleg elongation. Euchirinae is sometimes treated as a tribe (Euchirini) within Cetoniinae in alternate classifications, so rank may vary across sources. The fixed versus movable spine condition on forelegs is a key diagnostic character distinguishing male and female euchirines.