Keilbachia adstrictatula Mohrig & Kauschke, 2017

Mohrig, Werner, Kauschke, Ellen & Broadley, Adam, 2017, Black fungus gnats (Diptera: Sciaridae) of Queensland, Australia. Part I. Genera Chaetosciara Frey, Corynoptera Winnertz, Cratyna Winnertz, Epidapus Haliday, Keilbachia Mohrig, Lobosciara Steffan, Phytosciara Frey and Scatopsciara Edwards, Zootaxa 4303 (4), pp. 451-481 : 467-469

Keilbachia adstrictatula Mohrig & Kauschke sp. n.

( Fig. 12 A–B)

Type locality: Australia, Queensland, Black Mountain Road near Kuranda, 33 km WNW of Cairns, wet forest, Malaise trap, leg. J. Seymour.

Holotype: Male, 8.viii.1997, wet forest, Malaise trap, leg. J. Seymour (PWMP).

Description. Male. Head. Brown. Eye bridge 4 facets wide. Antenna brown; 4th flagellomere with l/w index of 2.0, with hairs as long as the diameter of the basal node, necks rather long, about 1/3 of the length of the basal node. Palpus 3-segmented, basal segment with one bristle. Thorax. Brown. Scutum with rather short hairs and some more robust lateral bristles; scutellum with 2 stronger marginal bristles. Postpronotum bare. Wing pale; R1 = 2/3 R; R5 without ventral macrotrichia; C somewhat longer than 1/2 w; y = x, without macrotrichia; posterior veins without macrotrichia. Haltere short and darkened. Legs yellowish brown; fore tibia with an irregular row of bristles at the inner apex, not distinctly bordered; middle and hind tibia with two equal spurs, much longer than the diameter of the apex. Claws toothless. Abdomen. Brown. Hypopygium brown, sparsely haired; gonocoxite shorter than gonostylus, with a long, strong bristle on the ventral apex, with short sparse hairs on the inner ventral margin; gonostylus slightly curved and concave on the inner side, apically narrowed and with two short bristle-like subapical spines within equally long hairs; on the inner side below the middle with a long and robust curved whiplash hair-like spine on a large base. Tegmen strongly bulging laterally. Aedeagus short. Body length: 1.5 mm.

Comments. The new species is characteriZed by a narrow gonostylus with 2 short rod-like apical spines within equally long hairs and the strongly curved whiplash hair-like spine on the inner side near the base. Keilbachia adstrictatula is very similar to K. indigena Mohrig, 2004 from Papua New Guinea. It differs by a narrower apex of the gonostylus with two rod-like spines within the hairs, a larger base of the whiplash hair-like spine, a longer aedeagus, a hairless space at the ventral base of the hypopygium and a more row-like arrangement of bristles on the apex of the fore tibia.

Distribution. Australia, Queensland.

Figures

FIGURE 12. Keilbachia adstrictatula Mohrig & Kauschke sp. n. A. Hypopygium; B. ApeX of fore tibia.