Keilbachia filigera, Hippa, Heikki & Vilkamaa, Pekka, 2007

Hippa, Heikki & Vilkamaa, Pekka, 2007, The flagria group of Keilbachia Mohrig (Diptera, Sciaridae) in a biodiversity hot spot: nine new sympatric species from Kambaiti, Myanmar, Zootaxa 1556, pp. 31-50 : 42

Keilbachia filigera sp. n.

( Figs 1 H, 2D, 3G, 6A, B)

Material studied. Holotype male (in NRMS). N.E. Burma ( Myanmar), Kambaiti, 7000 ft., 28.5.1934, R. Malaise.

Male. Colour. The specimen is probably strongly faded, almost unicolorous pale yellowish-brown, katepisternum (preepisternum 2) appearing darker than the other parts of pleura and the wing seeming to be rather dark, especially the veins. Head. Eye bridge 3–4 facets wide. Face (prefrons) with 15 setae. Clypeus non-setose. Maxillary palpus ( Fig. 1 H) with 3 palpomeres. Palpomere 1 with 1 lateral seta, with many hyaline sensilla scattered on the dorsal surface, without sensory pit. Palpomere 2 with 4 setae. Palpomere 3 with 5 setae. Antennal flagellomere 4, Fig. 2 D. Thorax. Anterior pronotum with 5 setae. Episternum 1 with 10 setae. Wing. Length 3.5 mm. Width/length 0.40. R1/R 1.00. c/ w 0.62. r-m longer than bM, r-m/bM 1.37, r-m with 4 setae, bM non-setose. Legs. Apex of fore tibia, Fig. 3 G. Length of fore basitarsomere/length of fore tibia 0.75. Length of fore tibia/length of fore femur 1.44. Length of hind tibia/length of scutum+scutellum 2.87. Abdomen. Sternite 8 with ca. 30 setae, widely spread. Hypopygium. Fig. 6 A, B: Gonostylus with 3-4 long curved mesial megasetae arising from a common basal body and 6 megasetae in a row between these and the apical tooth, the most apical one of these on the ventral side of the apical tooth, the three most apical of these megasetae rather weak, not much stronger than the other setae of equal length. Tegmen with a broad base and a long narrow apical part, the latter with several lobes the details of which are difficult to see, broadly and conspicuously microtrichose apically.

Female unknown.

Discussion. Keilbachia filigera is not very similar to any other Keilbachia . It is distinguished by having five or six megasetae in a row between the curved megasetae and the apical tooth on the gonostylus instead of fewer. K. foveolata , which may seem similar, has only two palpomeres, not three. K. filigera is reminiscent of K. biflagrispina because of the narrow tegmen, which has long microtrichia in the apical part. Its gonostylus differs from that of K. filigera by having only three megasetae between the curved megasetae and the apical tooth, one near the curved ones, two near the apical tooth on the gonostylus. The number of curved megasetae is only two instead of three or four. Both these species resemble Keilbachia sp. 3 in the apically microtrichose tegmen. The latter lacks the megasetae except for the curved ones.

Figures

FIGURE 1. Maxillary palpus. A, Keilbachia acamptochaeta sp. n. (paratype). B, K. flabellata sp. n. (holotype). C, K. gigas sp. n. (holotype). D, K. fasciata sp. n. (holotype). E, K. foveolata sp. n. (holotype). F, K. bicuspis sp. n. (holotype). G, K. rima sp. n. (holotype). H, K. filigera sp. n. (holotype). I, K. oligonema sp. n. (holotype). Scale 0.10 mm.

FIGURE 2. Antennal flagellomeres 3 and 4 (A) and flagellomere 4 (B – E). A, Keilbachia bicuspis sp. n. (holotype). B, K. oligonema sp. n. (holotype). C, K. fasciata sp. n. (holotype). D, K. filigera sp. n. (holotype). E, K. rima sp. n. (holotype). Scale 0.10 mm.

FIGURE 3. Apical part of fore tibia, prolateral view. A, Keilbachia oligonema sp. n. (Burma). B, K. fasciata sp. n. (paratype). C, K. rima sp. n. (holotype). D, K. acamptochaeta sp. n. (paratype). E, K. flabellata sp. n. (holotype). F, K. foveolata sp. n. (holotype). G, K. filigera sp. n. (holotype). H, K. bicuspis sp. n. (holotype). I, K. gigas sp. n. (holotype). Scale 0.10 mm.

FIGURE 6. Part of hypopygium (A, C) and gonostylus (B, D), ventral view. A, B, Keilbachia filigera sp. n. (holotype). C, D, K. fasciata sp. n. (holotype). Scale 0.10 mm.