Discomyza Meigen

Zatwarnicki, Tadeusz & Cielniak, Magdalena, 2015, A review of the genus Discomyza (Diptera: Ephydridae) from Afrotropical, Australasian / Oceanian and Oriental Regions, Zootaxa 3963 (1), pp. 1-26 : 3

Genus Discomyza Meigen

Discomyza Meigen 1830: 76 (feminine). Type species: Psilopa incurva Fallén 1823 , by monotypy.─ Cresson 1939: 1 –6 [review].─ Mathis and Zatwarnicki 2005: 431 –443 [revision of New World fauna].─ Zatwarnicki and Mathis 2007: 241 – 266 [revision of Palearctic fauna].

Diagnosis. Moderately small to moderately large shore flies, body length 2.2–4.5 mm; generally black colored species. Face generally shiny, mostly bare of microtomentum, but conspicuously, transversely rugose, and with some vertical lines; 4–5 moderately-developed facial setae; arista pectinate, bearing 5–11 dorsal rays; frons rectangular, wider than long, mostly bare, shiny; intrafrontal setae absent; only reclinate fronto-orbital seta well developed, 2 proclinate setae evident but much smaller than reclinate seta, inserted anterior of reclinate seta; ocellar setae well developed; pseudopostocellar setae usually weakly developed, divergent and very slightly proclinate; both lateral and medial vertical setae well developed, above antennae a group (3–6) of small setulae, not visible by typical resolution of dissecting microscope; palpus black. Thorax: Scutum uniformly black or with whitish pattern, subshiny or dull; scutellum more or less trapezoidal ( Figs. 46 , 59 ). Prescutellar acrostichal setae lacking; presutural supra-alar seta evident but not well developed; postsutural supra–alar seta generally lacking; postalar seta 1; scutellar disc moderately setulose; basal scutellar seta over 1/2 length of apical seta; anepisternum with 2 large setae at posterior margin; katepisternum with 1 large setae. Halter with knob white to yellowish. Wing generally with some faint infuscation, often with distinct pattern along anterior margin and subapical and/or apical transverse bands; vein R2+3 well separated from costa, moderately long; R stem vein bearing 2–4 setulae dorsally; crossvein dm-m straight or slightly arcuate. Legs robust; forefemur bearing anteroventral comb-like setulae. Abdomen: Male terminalia: epandrium heavily sclerotized, generally of two kind of shapes: wide with high cercal cavity or narrow with short cercal cavity; pregonostylus at ventral margin of epandrium, varying considerably in shape; postgonostyli symmetrical or asymmetrical, generally elongate, if asymmetrical then right postgonostylus usually longer; medandrium broadly U-shaped; aedeagus tubular, elongate, wider basally; pre- and postgonite separated; pregonite short, bearing 2 apical setulae; hypandrium as shallowly pocket-like sclerite.

Figures

FIGURES 44 – 46. Wings and head with mesonotum. 44. Wing of Discomyza eritrea. 45. Wing of Discomyza fagomoga sp. nov. 46. Head with mesonotum of Discomyza fagomoga sp. nov., dorsal view. Scale bar 0.5 mm.

FIGURES 57 – 59. Wings and head with mesonotum. 57. Wing of Discomyza maculipennis. 58. Wing of Discomyza similis. 59. Head with mesonotum of Discomyza maculipennis, dorsal view. Scale bar 0.5 mm.