Temnostoma obscurum
Loew, 1864
Hairy-winged Falsehorn
Temnostoma obscurum is a of syrphid fly (flower fly) in the Syrphidae. It belongs to a known for elaborate mimicry, including darkened wing margins that resemble folded vespid wings and distinctive antennal-mimicking leg movements. The species is found in North America, with records from Canada and the United States. Like other Temnostoma species, it likely exhibits of solitary mason wasps (Eumeninae).
Pronunciation
How to pronounce Temnostoma obscurum: //ˌtɛm.nəˌstoʊ.məɒbˈskjʊr.əm//
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Identification
Distinguished from other syrphid flies by the combination of darkened wing margins and antennal-mimicking leg . Separated from other Temnostoma by subtle morphological details requiring close examination. Distinguished from actual by single pair of wings (Diptera), short (when not actively mimicking), and lack of a constricted wasp waist.
Images
Appearance
have a -like appearance with darkened leading edges on the wings that mimic the longitudinal folds of vespid wasp wings at rest. The body is marked with yellow and black coloration consistent with wasp mimicry. are relatively short compared to wasp models; the compensates by waving its front legs in front of the to simulate wasp antennae.
Habitat
Found in woodland edges and areas with sunlit vegetation. often perch on leaves in sunny locations.
Distribution
Canada and the United States.
Behavior
engage in elaborate mimicry , waving the front pair of legs in front of the to simulate the long of mason wasps. This behavior has been observed in the Temnostoma generally.
Ecological Role
are likely . Larval is not documented for this , though related Temnostoma larvae are reported to develop in decaying wood.
Human Relevance
Contributes to pollination. Its mimicry may cause confusion with stinging insects, though the is harmless.
Similar Taxa
- Temnostoma alternansSimilar -mimicking appearance and antennal-mimicking ; distinguished by specific wing and body markings
- Somula decoraAnother syrphid mimic with yellow and black coloration; lacks the darkened wing margins and antennal-mimicking leg of Temnostoma
- Sphecomyia vittataMore extreme yellowjacket mimic with longer, thicker ; lacks the leg-waving characteristic of Temnostoma
More Details
Mimicry notes
The Temnostoma is noted for carrying mimicry to extreme lengths, including both morphological and behavioral adaptations. The darkened wing margins specifically mimic the appearance of folded vespid wings, while the leg-waving compensates for the fly's short .