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TaxonomyBrowseInfoImagesLinksBooksData
Photo#1633234
heleomyzid - Amoebaleria defessa - female

heleomyzid - Amoebaleria defessa - Female
Brookside Gardens, Montgomery County, Maryland, USA
February 4, 2019
Size: ~9mm to wingtips
This one keys out to Amoebaleria in both the MND (1) and the older Gill (2) keys. Character states observed from the MND key: orbital plate not oblique; proepisternal bristle present, A1 + CuA2 reaching wing margin, size >>2mm and >>3mm, costal spines well-developed, tibial preapical dorsal bristles well-developed; only 1 pair of prosternal bristles present; anepimeron bare; anterior orbital bristle shorter than posterior orbital bristle.

According to Gill’s key to this genus, the presence of setae on the posterior half of the mesopleuron makes this A. defessa or A. sackeni. Steyskal synonomized those 2 into A. defessa (3).

I’d appreciate confirmation/correction of the ID. TIA

PS: There appears to be some disagreement about the current nomenclature. itis.gov considers A. sackeni to be an invalid junior synonym of Scoliocentra sackeni with a citation for a 1925 paper by Garrett and it doesn’t list A. defessa at all. Garrett’s paper actually does call it Amoebaleria sackeni. There’s also some discussion on diptera.info about moving one species of Amoebaleria to Gymnomus (here)

Images of this individual: tag all
heleomyzid - Amoebaleria defessa - female heleomyzid - Amoebaleria defessa - female heleomyzid - Amoebaleria defessa - female heleomyzid - Amoebaleria defessa - female heleomyzid - Amoebaleria defessa - female heleomyzid - Amoebaleria defessa - female

Moved tentatively
Moved from Heleomyzidae.

I asked Dr. Andrzej J. Woźnica, Wrocław University, to take a look at these photos. He replied:
"the specimen you found is a female, and cannot be precisely identified by me myself.
It could be an unknown not yet described species, but anyway it really keys out as Amoebaleria defessa (Osten Sacken)"

Given that he's the resident heleomyzid expert on diptera.info, I've moved it to species until someone sorts out the taxonomy

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