Bromeloecia seltzeri - NEW GENUS - Bromeloecia - BugGuide.Net

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Photo#1012207

Copyright © 2014 Joe R.

Bromeloecia seltzeri - NEW GENUS - Bromeloecia -

Hanover, Jo Daviess County, Illinois, USA
September 1, 2014
Size: ~1mm

The male metatarsus has a few enlarged hairs coming off the dorsum of tarsomere 4. The shape of this separates the three Neartic species. In B. winnemana there is a long process terminating in two long hairs. In B. tarsiglossa the long process ends in a setulose lobe. In seltzeri the process is very short and inconspicuous and ends in long hairs.

As best I can tell this is B seltzeri. There is a very short process and two long hairs. The process seems too short to be B. winnemana.

Images of this individual: tag all

Bromeloecia seltzeri - NEW GENUS - Bromeloecia - male

Bromeloecia seltzeri - NEW GENUS - Bromeloecia - male

Bromeloecia seltzeri - NEW GENUS - Bromeloecia - male

Contributed by Joe R. on 21 October, 2014 - 6:51pm
Last updated 1 November, 2014 - 11:41am

Moved

Moved from Limosininae.

… John F. Carr, 21 October, 2014 - 7:10pm

None of the above?

This does not look identical to any of the illustrations in Marshall (1983).

… John F. Carr, 21 October, 2014 - 7:01pm

seltzeri

I took another look at this specimen and it appears that there is a very short process and two long hairs, which would make this B. seltzeri. Unfortunately, this tiny fly is pushing the limits of what my iPhone and Leica can photograph. Eventually I'll get some higher res stacked photos of that tarsus...

… Joe R., 22 October, 2014 - 1:08pm

Look at the whole tarsus

Compare the proportions of all five segments of the tarsi. If I use the width of the first tarsomere as an arbitrary measurement unit, the tarsi of seltzeri are approximately

1.0x1.0, 1.1x0.8, 0.6x0.8, 0.4x0.8, 1.0x0.5

I get different values for your fly depending on which photo I use, so there's some confusion due to angle.

Also compare the shape of tarsomere 5. The reason I'm hesitant is, Marshall's revision was limited by the amount of material he had available. Mostly it came from one collector.

… John F. Carr, 1 November, 2014 - 8:16am

Moved

Moved from Limosininae.

… John F. Carr, 21 October, 2014 - 6:56pm

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