Myrmecolacidae

Definition

A family of Strepsiptera (twisted-wing parasites) comprising approximately 98 species in four genera, characterized by extreme sexual dimorphism and a split-host life cycle: males parasitize ants (Formicidae) while females develop within orthopteran hosts (grasshoppers, crickets, or katydids). The morphological divergence between sexes is so pronounced that females were historically described as separate taxa and remain difficult to associate with their conspecific males in museum collections.

Etymology

Example

In Myrmecolacidae, a free-living male with branched antennae and reduced wings emerges from its ant host to seek a female, while his conspecific remains as an endoparasitic, larviform female hidden within a grasshopper abdomen, releasing brood via a birth canal that protrudes through the host's cuticle.

Related Terms

• Strepsiptera
• Stylopidae
• Sexual dimorphism
• heteronomous parasitism
• Endoparasite
• Hypermetamorphosis
• ant parasitism

Usage Notes

The family exemplifies heteronomous parasitism—different host use by each sex—rare among insects. Taxonomic work is complicated by the near-impossibility of matching females to males without molecular data or rearing records. Myrmecolacidae is one of nine recognized families in Strepsiptera, distinguished from the more species-rich Stylopidae (which parasitize bees and wasps) by host associations and male antennal structure.