Dalmanniinae

Dalmanniinae can be distinguished from other Conopidae subfamilies by the following features: head capsule often with prominent facial swelling; antennae with arista bare or shortly pubescent; wing with specific venation patterns including reduced anal lobe and characteristic bend in vein R4+5; body generally more robust than Stylogasterinae. The genus Dalmannia is recognized by its large size and distinctive head shape, while Zodion species are smaller with more slender bodies.

The subfamily Dalmanniinae has a primarily Holarctic distribution, with species recorded from North America, Europe, and Asia. Records from iNaturalist indicate observations across temperate regions of North America and Europe.

Adult activity has been observed primarily during the warmer months, with peak records from late spring through summer (May–August in temperate regions).

• Hymenoptera - parasitoidLarvae are endoparasitoids of bees and wasps, including members of families Apidae, Vespidae, and Sphecidae. The female fly deposits larvae directly onto foraging hosts or injects them into the host body.

Females are known to attack host Hymenoptera in flight, depositing larvae that penetrate the host's body wall. Larval development occurs within the living host, eventually killing it. Pupation takes place in the soil after the host dies. The complete life cycle from egg to adult spans approximately one year in temperate species.

Adults have been observed hovering near flowers and host nesting sites. Females exhibit aggressive pursuit behavior, actively chasing potential hymenopteran hosts in flight to deposit larvae. Males are often found perching on vegetation, awaiting females.

As parasitoids of bees and wasps, Dalmanniinae function as population regulators of Hymenoptera. They may exert selective pressure on host foraging behavior and nesting strategies. Their role in pollination networks is indirect, as adults visit flowers primarily for nectar.

Some species parasitize beneficial pollinators such as honey bees and bumble bees, potentially impacting local pollinator populations. They are occasionally cited in studies of bee health and parasitoid pressure in agricultural settings.

• ConopinaeThe other major subfamily of Conopidae; distinguished by differences in head morphology, particularly the degree of facial swelling and the structure of the occiput, as well as differences in larval host associations.
• StylogasterinaeDistinguished by the highly modified female abdomen with an extremely long, rigid ovipositor used to harpoon hosts, a feature absent in Dalmanniinae.

• parasitoid
• Hymenoptera parasite
• Diptera
• thick-headed fly
• Holarctic

• BugGuide
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life