Ornidia

Small to mid-sized hoverflies with metallic green, blue, or bronze integument. Body length 2.3–4.2 mm. Distinguished from other metallic syrphids by combination of small size, New World distribution (native range), and specific wing venation patterns characteristic of Volucellini. Ornidia obesa can be recognized by its robust body form and extensive distribution outside native range.

Native species occur in various New World environments. Ornidia obesa has been documented breeding in accumulated chicken feces in poultry farms, particularly under cages in commercial houses with earthen floors.

All species endemic to the New World. Ornidia obesa is widespread in the Americas and has established populations across the Pacific, throughout the Oriental region, and along the east coast of Africa. Documented in Brazil (Goiás state) in poultry farm environments.

• Pachycrepoideus vindemmiae - parasitoidHymenoptera: Pteromalidae; emerged from pupae collected in chicken feces in Brazil
• Spalangia cameroni - parasitoidHymenoptera: Pteromalidae; emerged from pupae collected in chicken feces in Brazil

Serves as host for parasitoid wasps in the family Pteromalidae in agricultural environments. Adults have been documented to harbor bacteria of public health importance.

Ornidia obesa has spread globally through human commerce, becoming established in poultry farming systems outside its native range. Associated with public health concerns due to bacterial carriage.

• Other metallic Syrphidae generaOrnidia species share metallic coloration with numerous other hoverfly genera (e.g., some Eristalis, Merodon), but differ in small size, specific wing venation, and geographic origin for native species.

• metallic
• hoverfly
• poultry pest
• introduced species
• New World endemic
• parasitoid host

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Parasitoides de Ornidia obesa Fabricius (Diptera: Syrphidae) coletados em fezes de galinha no Brasil