Keilbachia brevicoxa, Vilkamaa, Pekka, Menzel, Frank & Hippa, Heikki, 2009

Vilkamaa, Pekka, Menzel, Frank & Hippa, Heikki, 2009, Review of the genus Keilbachia Mohrig (Diptera: Sciaridae), with the description of eleven new species, Zootaxa 2272, pp. 1-20 : 8-9

Keilbachia brevicoxa sp. n.

( Fig. 4 A–E)

Description. Male. Colour. Almost unicolorous pale brown, maxillary palpus and legs paler brown than the other parts, abdomen slightly paler than thorax, wing fumose brownish, haltere pale brown. Head. Eye bridge 3 facets wide. Face (prefrons) with 10 widely spread setae. Clypeus non-setose. Maxillary palpus, Fig. 4 A: with 3 palpomeres. Palpomere 1 with 1 seta, the hyaline sensilla in patch on the dorsal surface, no sensory pit. Palpomere 2 with 4 setae. Palpomere 3 with 5 setae. Antennal flagellum beyond 1 lost in the holotype, scape, pedicel and flagellomere 1, Fig. 4 B. Thorax. Anterior pronotum with 3 setae. Episternum 1 with 5 setae. Wings. Length 1.3 mm, partly broken in the specimen, width not measurable. R1/R 0.70. c/ w 0.80. r-m and bM of equal length, but no exact measures were made because the basal parts of stM and bM are difficult to see; r-m and bM non-setose. Legs missing or in poor condition in the specimen; no measurements made. Fore tibia subapically with a prolateral row of strong setae, Fig. 4 C. Abdomen. Sternite 8 with 7 setae in a transverse row on posterior part. Hypopygium ( Fig. 4 D, E). Tegmen with roundish apical part and with distinct basolateral shoulders. Aedeagal apodeme very narrow, moderately long. Gonocoxite with ventroapical corner elongated, mesial margin and membrane with rather long setae. Gonostylus large, longer than gonocoxite, broad, with roundish lateral side, with a mesial processus. Gonostylus also with a short, curved sub-basal megaseta on a small basal body, with one subapical megaseta, no apical tooth.

Female. Unknown.

Discussion. Keilbachia brevicoxa resembles K. hamata Menzel, 1995 , also described from Nepal, by having the gonostylus protruded mesially lobe-like, with one rather stout short and curved megaseta subbasally on the gonostylus, and by lacking the apical tooth. K. brevixoca differs by having the gonostylus relatively larger, the mesial protrusion of gonostylus smaller, and by having only one, not two, subapical megasetae, and by lacking a long seta mesially. In addition, K. brevicoxa is obviously much smaller, and has most of the modified subapical setae of the fore tibia thick and in a row, not slender and in a large patch.

Figures

FIGURE 4. Keilbachia brevicoxa sp. n. (holotype). Maxillary palpus (A) in lateral view, scape, pedicel and flagellomere 1 of antenna (B), in ventral view, apex of front tibia (C) in prolateral view, part of hypopygium (D) and gonostylus (E) in ventral view. Scale for B 0.05 mm, for others 0.10 mm.