Keilbachia bifida, 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 : 6-7

Keilbachia bifida sp. n.

( Fig. 3 A–D)

Type locality: NEPAL: Gandaki Prov., Himalaya, Annapurna mountain massif, NE of Pokhara, near Chipli.

Material examined: Holotype male. NEPAL: Gandaki Prov., Himalaya, Annapurna mountain massif, NE of Pokhara, near Chipli, 2400 m a.s.l., out of the inflorescence of Arisaema spec., 22.4.1996, leg. O. Jäger ( SDEI).

Description. Male. Colour. Head and thorax dark brown; antenna, coxae, abdomen and hypopygium paler brown, legs yellowish, wings fumose. Head. Eye bridge, face (prefrons) and clypeus poorly seen in the specimen studied. Maxillary palpus with 3 palpomeres. Palpomere 1 with 1 seta, the hyaline sensilla in patch on the dorsal surface, no sensory pit. Palpomere 2 smaller than palpomere 1, with 4 setae, palpomere 3 elongated, with 6 setae. Antenna long, both partly distorted in the specimen, flagellomeres 1 and 2, Fig. 3 A. Thorax. Anterior pronotum with 3 setae. Episternum 1 with 6 setae. Wings. Length 2.4.mm, width/length 0.4. R1 long, R1/R 2.0. c/ w 0.8. r-m and bM of about equal length, r-m and bM non-setose. Anal lobe rather strong. Legs. Apex of fore tibia, Fig. 3 B. Length of fore basitarsomere/length of fore tibia 0.60. Tibial spurs longer than the apical width of tibiae. Spinose setae of tibiae and tarsi long. Abdomen. Abdominal setae long and strong. Setae of sternite 8 not seen in the holotype. Hypopygium ( Fig. 3 C, D). Tegmen triangular, with long apodemes. Aedeagal apodeme moderate. Gonocoxite as long as gonostylus. Gonostylus evenly broad, curved mesiad, with two curved slender megasetae arising from a common basal body at the basal third of gonostylus, three additional hyaline mesial megasetae placed separately, apical tooth present.

Female. Unknown.

Discussion. Keilbachia bifida is similar to K. biflagrispina Mohrig , K. acamptochaeta Hippa & Vilkamaa and K. bicuspis and K. inscissa by having an apical tooth and two megasetae arising from a common basal body of the gonostylus, and by being fairly large, with a wing length of more than 2 mm. K. bifida is similar to K. biflagrispina and K. inscissa , and differs from K. acamptochaeta and C. bicuspis by having the basal megasetae of the gonostylus very slender. K. bifida differs from K. biflagrispina and K. inscissa by having the basal megasetae shorter. K. bifida has three additional very slender megasetae mesially on the gonostylus wide apart, whereas K. biflagrispina has one at the middle and two very near the apical tooth, and K. inscissa has a group of four subapically near the apical tooth.

Figures

FIGURE 3. Keilbachia bifida sp. n. (holotype). Antennal flagellomeres 4 and 5 (A) in lateral view, apex of front tibia (B) in prolateral view, part of hypopygium (C) and gonostylus (D) in ventral view. Scale for A 0.05 mm, for others 0.10 mm.