Nemorimyza Frey

Nemorimyza Frey, 1946: 46 [as subgenus of Dizygomyza]. Type species: Agromyza posticata Meigen, 1830, by monotypy. Frick 1959: 377 [as subgenus of Phytobia]; Nowakowski 1962: 97 [as genus]. Spencer 1986b: 87; Zlobin 1996: 273.

Annimyzella Spencer, 1981: 144 [as subgenus of Amauromyza]. Type species: Agromyza maculosa Malloch, 1913. Zlobin 1996 [synonymy].

Nemorimyza is a robust-bodied genus of Phytomyzinae that closely resembles Phytobia in its size and semi-circular, pale, silvery lunule (pale or dark in Phytobia), strong setae with the prescutellar acrostichals present, reclinate orbital setulae, and in having the costa extend to M1 (R4+5 in some Phytobia) and the apex of the wing between the ends of veins R4+5 and M1. Differences from other genera are few, however, making this a difficult taxon to diagnose. Zlobin (1996) was the most recent to thoroughly redefine the genus, and noted that the epandrium has a characteristic morphology, and the surstylus is free from the epandrium, angled posteroventrally and articulates with the subepandrial sclerite. Most species also have brown markings on the halter (Chen and Wang 2008) and some have a small mediolateral seta on the fore tibia.

Within the genus, hosts are only known for two widespread species that also happen to occur in the Delmarva states. Both Nemorimyza maculosa and N. posticata are leaf-miners of Asteraceae .