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Turquoise-striped Syrphid- Didea sp? - Megasyrphus laxus

Turquoise-striped Syrphid- Didea sp? - Megasyrphus laxus
Fundy National Park Visitors Reception Centre Native Garden, Albert County, New Brunswick, Canada
August 9, 2014
I am not not sure of the species, but I do think this is in the Genus Didea. It is also unusual in its coloration, but I do see that the lone representative of Didea alneti on the site here is also turquoise-striped as in this individual. However, this individual's markings do not seem to correspond to D. alneti, but is close to Didea fuscipes. Apparently, there are also some individuals of Didea fasciata in Europe that can also be turquoise-striped. Any more info on this individual's ID and coloration would be appreciated.

Images of this individual: tag all
Turquoise-striped Syrphid- Didea sp? - Megasyrphus laxus Turquoise-striped Syrphid- Didea sp? - Megasyrphus laxus Turquoise-striped Syrphid- Didea sp? - Megasyrphus laxus Turquoise-striped Syrphid- (Edited: Very likely Megasyrphus) - Megasyrphus laxus

Moved from Megasyrphus.

Moved from Syrphid Flies.

At first I went "Oh man, Dide
At first I went "Oh man, Didea alneti!" (since the only photo we have of that species is also turquoise). However, the pale markings extending to the edge of the abdomen, darker frons (barely visible), and oval rather than tapered basoflagellomere indicate Megasyrphus instead.

Regrettably, Vockeroth only mentions Megasyrphus laxa, and the key that includes the other Nearctic species (Megasyrphus catalina) is not available in English. Vockeroth does mention that some individuals are greenish-yellow rather than yellow in the abdominal markings, but this is more greenish-blue... unsure why.

Moving to genus for now.

Thanks, Kelsey!
Is the key you mention in French? If so, I can read that (it is my mother tongue) and perhaps bring this to species. Could you send me the link? ALso, I am adding one more image which shows the wing venation of R4+5 better, confirming that it is NOT Dideomima.

Alas, it's in German (I have
Alas, it's in German (I have some French, though very little, so would try myself, though doubtless you'd do much, much better!):

Dusek, J. and Laska, P. 1967. Versuch zum Autbau eines natiirlichen Systems mitteleuropiischer Arten der Unterfamilie Syrphinae (Diptera). Acta Scientiarum Naturalium Academiae Scientiarum Bohemoslovacae, 1: 349-390.

Great shots! Thanks for the extra photo too - it also shows the frons which is yellowish in Didea and black in Megasyrphus (and here). And I see that several other Megasyrphus also have the greenish-blue color...

Thanks again!
I may give that German one a whirl. I did 2 years worth in university, but I imagine that was not technically oriented enough to help. Interesting that several of the other blue-green striped ones were from Maine (next door to us).

Well, notes that
Well, notes that Megasyrphus catalina is found in Arizona only - though that's probably because that's the type locality. I'll take a look at Curran's description and see if it differs obviously from Megasyrphus laxa/laxus...

Okay, found it quickly. Curran notes that it's "Related to laxa Osten Sacken but the lower half of the front is reddish yellow and the legs are much less black... second and third reddish yellow abdominal bands entire..."

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