Keilbachia cornuta, 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 : 10-11

Keilbachia cornuta sp. n.

( Fig. 6 A–D)

Type locality: JAPAN: Kagoshima Pref., Kirishima.

Material examined: Holotype male. JAPAN: Kyushu Island, Kagoshima Pref., Kirishima, sweep-net, 7.6.1998, leg. M. Sutou ( NSMT). Paratype. JAPAN: Honshu Island, Miyagi Pref., Iwadeyama, sweep-net, 1 male, 24.8.1998, leg. M. Sutou ( SDEI).

Description. Male. Colour. Head and scutum medium brown; antenna, pleura and abdomen and hypopygium pale brown, legs yellow. Wing fumose. Head. Eye bridge 3 facets wide. Face (prefrons) with 10 widely spread setae. Clypeus with 1 seta. Maxillary palpus with 3 palpomeres. Palpomere 1 with 1 seta, the hyaline sensilla in patch on the dorsal surface, no sensory pit. Palpomere 2 with 5 setae, palpomere 3 with 5 setae. Antennal flagellum moderately long, flagellomere 4, Fig. 6 A, body 1.6 times as long as wide. Thorax. Anterior pronotum with 3 setae. Episternum 1 with 4 setae. Wings. Length 1.1 mm, width/length 0.50. R1/R 0.70. c/ w 0.70. r-m and bM of nearly equal length, non-setose. Anal field rather strong. Legs. Apex of fore tibia, Fig. 6 B. Length of fore basitarsomere/length of fore tibia 0.45. Abdomen. Sternite 8 with 7 setae. Hypopygium ( Fig. 6 C, D). Tegmen with sub-basal shoulders, parameres sclerotised, extending apically to form distinct horns. Aedeagal apodeme short, ca. 15 aedeagal teeth. Gonocoxite slightly longer than gonostylus. Gonostylus narrow, with a sub-basal long strongly curved megaseta on a short basal body, with 1– 2 slightly differentiated megasetae sub-apically, no apical tooth.

Female. Unknown.

Discussion. Keilbachia cornuta is similar to K. camptonema Hippa & Vilkamaa from Malaysia, both having a long, strongly looped mesial megaseta. K. cornuta differs by having two hyaline megasetae basad from the apex of the gonostylus, whereas K. camptonema has three thick ones, one of which is at the very apex of the gonostylus. Furthermore, K. cornuta has a broader gonostylus and the parameres extending beyond the apex of the tegmen.

Figures

FIGURE 6.. Keilbachia cornuta sp. n. (holotype). Antennal flagellomere 4 (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.