Stylogaster biannulata
(Say, 1823)
thick-headed fly
Stylogaster biannulata is a of thick-headed fly in the Conopidae, Stylogastrinae. It is one of only two Stylogaster species known from North America. The species is distinguished from its S. neglecta by antennal proportions: in S. biannulata, the second antennomere is almost as long as the third, whereas in S. neglecta the second antennomere is notably shorter. possess an extremely elongated that exceeds body length when fully extended.
Pronunciation
How to pronounce Stylogaster biannulata: /ˌstaɪloʊˈɡæstər ˌbaɪəˈnjuːlɑːtə/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Distinguished from the only other North American , Stylogaster neglecta, by antennal structure: in S. biannulata, the second antennomere is nearly as long as the third, while in S. neglecta the second antennomere is distinctly shorter than the third. The extremely elongated and slender body separate Stylogaster from other conopid . Identification to species requires close examination of antennal proportions.
Appearance
have a slender body with a highly elongated, needle-like in females. The is exceptionally long, extending beyond the body length when fully extended. show distinctive proportions: the second antennomere is subequal in length to the third antennomere. Body coloration and detailed measurements are not well documented in available sources.
Distribution
North America; specific range details beyond continental occurrence are not well documented in available sources
Diet
feed on nectar using their elongated to access floral resources; larval diet unknown but presumed internal of as in
Host Associations
- crickets - presumed inferred from -level ; not confirmed for this
- cockroaches - presumed inferred from -level ; not confirmed for this
- calyptrate flies - presumed inferred from -level ; not confirmed for this
Life Cycle
possess a rigid barbed tip, suggesting forcible insertion into . Larvae develop as internal within hosts. Detailed stages for this are not documented.
Behavior
females aggressively intercept potential in for oviposition. The elongated is used to access nectar at flowers.
Ecological Role
Internal of other insects as larvae; pollination services at flowers via nectar feeding
Similar Taxa
- Stylogaster neglectaOnly other North American Stylogaster ; distinguished by shorter second antennomere relative to third
- Other ConopidaeStylogaster separated from other conopids by extremely elongated and distinctive abdominal in females
More Details
Taxonomic history
Originally described as Myopa biannulata by Thomas Say in 1823, later transferred to Stylogaster. The Stylogaster is placed in its own Stylogastrinae due to distinctive and .
Etymology
name derived from Greek stilus (needle) and (belly), referring to the elongated female . Specific epithet biannulata presumably refers to two annular markings, though this is not confirmed in available sources.
Global genus diversity
Stylogaster contains approximately 92 described worldwide, with the vast majority distributed in the Neotropics, sub-Saharan Africa, and Southeast Asia.