Euhexomyza Lonsdale, 2014

Lonsdale, Owen, 2021, Manual of North American Agromyzidae (Diptera, Schizophora), with revision of the fauna of the " Delmarva " states, ZooKeys 1051, pp. 1-481 : 1

Euhexomyza Lonsdale

Euhexomyza Lonsdale, 2014: 497. Type species Melanagromyza simplicoides Hendel 1920, by original designation.

Euhexomyza was described by Lonsdale (2014) for a lineage of mostly north-temperate Salicaceae -feeding species where the larva forms an ovate gall in the cortex of a twig. These species were previously treated as part of Hexomyza Enderlein, but Lonsdale (2014) found the genus to be a polyphyletic dumping ground for a miscellany of gall-forming species, with the morphologically disparate type species belonging to Ophiomyia . He subsequently included the name Hexomyza as a junior synonym of Ophiomyia .

Species are brown and non-metallic (Fig. 44 ), they have a rounded clypeus and lack a prescutellar acrostichal. The fronto-orbital plate and parafacial are pronounced, forming a strong ring around the eye, the postsutural intra-alars are subequal (anterior seta never strong), and only the mid tibia sometimes has a lateromedial seta. The male genitalia (at least of the north temperate Salicaceae -feeders) are typified by a distiphallus that has the base broad and rounded and the apex tapered, and the phallophorus has a unique ventral “pouch” emerging from the distal margin (Fig. 250 ; Lonsdale 2014: fig. 62).

Figures

Figure 250. Euhexomyza albicula (Spencer), male holotype genitalia, with phallus (broken off) inset at right, ventral view.

Figures 37 - 44. 37 Agromyza aristata Malloch, female lateral 38 Agromyza bispinata Spencer, female lateral with detail of stridulatory file 39, 40 Agromyza kincaidi Malloch, male head (arrow indicates discrete apical tuft of hairs) 39 lateral 40 same, anterior 41, 42 Agromyza bispinata, male head 41 lateral 42 same, anterior 43 Agromyza sp., female (S. A. Marshall - Ontario, Hornings Mills) 44 Euhexomyza schineri (Giraud) (T. Murray - Massachusetts, Groton).