Interesting acalyptrate (?) fly with pale bulging face - Anorostoma - BugGuide.Net

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Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Flies (Diptera) » "Acalyptratae" » Sphaeroceroidea » Heleomyzidae » Heleomyzinae » Heleomyzini » Anorostoma

Photo#1696501

Copyright © 2019 California Academy of Sciences, photo K Schneider

Interesting acalyptrate (?) fly with pale bulging face - Anorostoma

Presidio, Dragonfly Creek, San Francisco County, California, USA
July 8, 2019
Size: 7 mm

Caught in Malaise trap 4-13 July 2019. Clearly a ptilinal fissue, I think, and appears to be an acalyptrate fly (no seam on second antennal segment, no transverse thoracic suture), but I got lost in that section of the key, could not key to anything that made sense... Maybe a subcostal break, but hard to be sure. Sc seems to fuse with R1 before costa...

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Interesting acalyptrate (?) fly with pale bulging face - Anorostoma

Interesting acalyptrate (?) fly with pale bulging face - Anorostoma

Interesting acalyptrate (?) fly with pale bulging face - Anorostoma

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Contributed by Ken Schneider on 19 July, 2019 - 10:47pm
Last updated 13 December, 2022 - 11:25pm

Moved

Moved from Heleomyzinae.

… Chris Angell, 13 December, 2022 - 11:25pm

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Moved

Moved from Heleomyzidae.

… Chris Angell, 11 December, 2022 - 11:04am

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Aberrant R1?

Moved from Flies.

Went back to specimen and it looks right for this family to me now too, FWIW.

I'm having trouble understanding the relationship of R1 and Sc here (added photo), which is what confused me when I first keyed this out. I see a thin Sc vein curving up and meeting the costa and can now appreciate the "normal part" of R1 curving and meeting costa far distal to Sc. But what is the deal with the thick, darkened part of R1 (it's not just wing pigment) that appears to curve up around the same place that Sc curves? It looks like R1 branches essentially...

… Ken Schneider, 22 July, 2019 - 1:53pm

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Try Heleomyzidae

The strong bristles on the costa suggest Heleomyzidae and I don't see anything to rule out that family. Sc and R1 end widely separated.

… John F. Carr, 20 July, 2019 - 4:41am

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