Dichopygina praeaculeata, Mohrig, Werner & Kauschke, Ellen, 2017

Mohrig, Werner & Kauschke, Ellen, 2017, New Black Fungus Gnats (Diptera, Sciaridae) of North America. Part III. Genera Camptochaeta Hippa & Vilkamaa, Claustropyga Hippa, Vilkamaa & Mohrig and Dichopygina Vilkamaa, Hippa & Komarova, Zootaxa 4258 (4), pp. 301-326 : 322-324

Dichopygina praeaculeata sp. n.

Fig. 10 A‒B; plate V, fig. IX

Locus typicus: Canada, Munn Creek, 53.30°N, 118.10°W, spruce forest. Holotype: Male, 23.vii.‒15.ix.1994, leg. E. Fuller, Malaise trap ( PWMP).

PLATE V. Figure IX Hypopygium of Dichopygina praeaculeata sp. n.

Description. Male. Head. Eye bridge 3 facets wide; antennae brown; 3rd flagellomere with l/w-index of 2.8, haired as long as diameter, neck rather short. Palpus are 3-segmented, first segment with one bristle and a flat sensory pit. Thorax. Brown, coxae paler. Scutum is haired rather long, brownish; scutellum with two longer bristles; posterior pronotum bare. Wings brownish; R1 = 3/4 R; c = 2/3 w; y shorter x; y without macrotrichia; posterior wing veins distinct, without macrotrichia. Haltere short, brownish. Legs are missing. Abdomen. Hypopygium without a lobe or a bristle patch at the ventral base; gonocoxites haired rather long and sparsely at the inner ventral margin; gonostylus concaved at the inner side, with a short dark apical tooth and 3 longer spines at the inner side of the apical concavity. Tegmen rounded, with fine teeth and a short aedeagus. Body length: 2.5 mm.

Comments. The species is characterized by a short apical tooth and 3 longer spines at the inner side of the apical concavity. It is similar to Di. aculeata Vilkamaa, Hippa & Komarova, 2004 but differs from it by having only three spines in a shorter apical concavity.

It resembles also Di. intermedia ( Mohrig & Krivosheina, 1982) which is the only known species of the genus having spines exclusively in the apical quarter of gonostylus. Dichopygina praeaculeata sp. n. can be distinguished from Di. intermedia ( Mohrig & Krivosheina, 1982) in having the dorsolateral margin of gonostylus subapically less distinctly curved (see Fig. 7 G in Vilkamaa et al. (2004), and in having the bases of the three gonostylar spines close to each other. Spines are pointing in different directions.

Distribution. Canada (Alberta).

Figures

FIGURE 7. Camptochaeta unispina sp. n. Male. Holotype. A. Hypopygium. B. Gonostylus. C. Antennal flagellomeres 3 ‒ 4. D. Apex of fore tibia.

FIGURE 10. Dichopygina praeaculeata sp. n. Male. Holotype. A. Hypopygium. B. Gonostylus.