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Syrphidae
Spazigaster ambulans (Fabricius)
Nomenclature
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Tribe: BacchiniGenus: Spazigaster
SUMMARY
Following Gharali and Reemer (2010), the genus Spazigaster is separated from other genera in the subfamily Syrphinae by the combination of the following characters: black face and scutellum; antenna shorter than head; arista plumose (hairs more than twice as long as aristal width); calypter bare; anepisternum bare; katepisternum with pile patches widely separated; metasternum entire (not reduced); male metatibia with concave depression; abdomen elongate and petiolate (obvious in female, less obvious in male) with tergum 2 narrower than tergum 3; terga without marginal sulcus.
Spazigaster ambulans is similar to S. nostra, but differs by having pile on face, scutum and scutellum completely pale (mostly black in nostra); metaleg in male with deep emargination (about as deep as width of tibia at level of emargination) (Gharali and Reemer 2010).