Fungus Gnat - Acnemia - BugGuide.Net

Moved

… John R. Maxwell, 10 January, 2010 - 8:45am

Moved

… John F. Carr, 28 December, 2009 - 7:37am

Gnat

I tentatively say Mycetophilidae, but the only kinds I have so far found without a forked Cu vein have strong spines on the middle tibia and I don't see any of those here.

… John F. Carr, 27 December, 2009 - 6:40pm

Wing Venation

John,
Hopefully my added venation image will help

… Robert Lord Zimlich, 30 December, 2009 - 7:24am

Mycetophilidae

Looks like a male Acnemia sp.

… Bjoern Rulik, 10 January, 2010 - 8:14am

Thanks for ID

Turns out there's an error in the key I used. To get to Acnemia you have to take a choice "Cu forks distad of the fork of M". That should read "Cu not forked, or forks distad of the fork of M." I gave up when neither choice matched.

… John F. Carr, 10 January, 2010 - 8:54am

John: Which key you

are using? Within Sciophilinae three genera (Acnemia, Cluzobra & Monoclona) have an unforked CuA in the Neartic region....

Cheers

… Bjoern Rulik, 10 January, 2010 - 10:25am

Insects of Connecticut

I'm using the key by Shaw in Insects of Connecticut, which is old but I expect to work for the common species. It is older than 1997, when the first nearctic Cluzobra was described, so only Acnemia and Monoclona are listed as having unforked Cu.

Is there a good, modern reference to the fungus gnats of North America?

… John F. Carr, 10 January, 2010 - 11:03am

Manual of Nearctic Diptera Vol. I

Well, recent identification key is still Vockeroth (1981), in which already Cluzobra is keyed out. With some exceptions it is impossible identifying fungus gnats from photos at species level with certainty, but often genus level is possible.

literature cited:

Vockeroth, J.R. (1981): Mycetophilidae - In: McAlpine, J.F., B.V. Peterson, G.E. Shewell, H.J. Teskey, J.R. Vockeroth & DM. Wood, coords., Manual of Nearctic Diptera. Volume 1. Research Branch, Agriculture Canada. Monograph 27. Ottawa: 223-246.

… Bjoern Rulik, 1 February, 2010 - 6:52am

Not an ID

but some Keroplatidae may be close, do the wing veins and comments in these help? "In Keroplatidae the base of vein M is missing or weak."

I'm not good with this at all.

… John R. Maxwell, 28 December, 2009 - 7:42am

Missing crossvein?

My understanding is, Keroplatidae have crossveins joining Rs to form a nearly continuous, diagonal vein across the wing.

… John F. Carr, 28 December, 2009 - 8:10am

fungus gnat, i guess

pls wait for an expert

… v belov, 27 December, 2009 - 5:42pm