Diphyllostomatidae

Definition

A small family of rare beetles (Coleoptera: Scarabaeoidea) endemic to California, containing the single genus Diphyllostoma, commonly called false stag beetles. Adults are diurnal with flightless females; larvae remain undescribed and the complete life history is unknown. The family represents a phylogenetically isolated lineage whose placement within Scarabaeoidea has been historically debated.

Etymology

Example

Field surveys for Diphyllostomatidae rely on visual searching for diurnal adults near oak woodlands, as the flightless females cannot be attracted to light traps.

Related Terms

• Scarabaeoidea
• Diphyllostoma
• false stag beetle
• flightlessness
• California endemic

Usage Notes

Sometimes treated as a subfamily (Diphyllostomatinae) within Lucanidae in older classifications; current consensus based on molecular phylogenetics recognizes family rank. The group is frequently cited in discussions of relictual beetle faunas and incomplete life-history knowledge in Coleoptera.