Tropidia longa

{{Short description|Species of fly}}

{{Speciesbox

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| genus = Tropidia (fly)

| species = longa

| display_parents = 3

| authority = (Walker, 1849){{cite book|last1=Walker|first1=F.|title=List of the specimens of dipterous insects in the collection of the British Museum. Part III|date=1849|publisher=British Museum (Natural History)|location=London|pages=485–687}}

| synonyms = *Helophilus longus Walker, 1849

• Tropidia dicentria Speiser, 1913{{cite journal |last1=Speiser |first1=Paul Gustav |title=Beiträge zur Dipterenfauna von Kamerun. I |journal=Deutsche Entomologische Zeitschrift |date=1913 |volume=1913 |pages=131-146 |url=https://www.biodiversitylibrary.org/page/33049656#page/173/mode/1up |access-date=16 July 2021}}

}}

Tropidia longa is a species of hoverfly in the family Syrphidae.{{cite book |last1= Smith |first1= Kenneth G.V. |last2= Vockeroth |first2= J.R. |editor1-first= R.W. |editor1-last=Crosskey |title= Catalogue of the Diptera of the Afrotropical Region |date= 1980 |publisher= British museum (Natural History)|location= London |isbn= 0565 00821 8 |pages= 1-1436 }}