Keilbachia flabellata , 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: 42-43

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Keilbachia flabellata

sp. n.

Keilbachia flabellata  sp. n.

( Figs 1View FIGURE 1 B, 3 E, 4 A, 7 A–D)

Material studied. Holotype male (in NRMS). N.E. Burma ( Myanmar), Kambaiti, 7000 ft., 8.6. 1934, R. Malaise. Paratypes (in NRMS). 2 males with same data as holotype but dated 25.5. and 26.5.

Male. Colour. The specimen is strongly faded, almost unicolorous pale yellowish-brown. Head. Eye bridge 4–5 facets wide. Face (prefrons) with 1–3 setae. Clypeus non-setose. Maxillary palpus ( Fig. 1View FIGURE 1 B) with one palpomere, with one lateral seta, hyaline sensilla widely scattered on dorsal surface, no sensory pit. Antennal flagellomere 4 ca. one-and-a-half times as long as broad, rather deformed in both specimens and not drawn. Thorax. Anterior pronotum and episternum 1 with 1–2 setae each in the holotype, not possible to see in the paratypes. Wing, Fig. 4View FIGURE 4 A. Both wings lost in one of the paratypes. Length 1.67–1.95 mm. Width/length 0.42–0.48. R 1 /R 1.00. The meeting point of R 1 and C in basal half of wing not as in the other species. c/ w 0.80 –0.87. r-m shorter than bM, r-m/bM ca. 0.81–0.87, r-m with 1–2 setae, bM non-setose. Legs. Apex of fore tibia, Fig. 3View FIGURE 3 E. Length of fore basitarsomere/length of fore tibia 0.72–0.78. Length of fore tibia/length of fore femur 1.56–1.58. Length of hind tibia/length of scutum+scutellum 1.95–2.16. Abdomen. Sternite 8 in holotype with 10 setae, in a transverse posterior row, with one of the setae near the lateral margin placed more anteriorly, one of the paratypes apparently similar but the exact number difficult see and the other paratype with 13 setae in similar pattern but with three setae placed medially in a more anterior position. Hypopygium. Fig. 7View FIGURE 7: Gonostylus with 5 long mesial megasetae arising from a common basal body, the megasetae curved except on one side in the holotype where they are unusually straight, with no additional megasetae but with two stronger setae diverging from other nearby setae near the base of the apical tooth. Tegmen rather simple, subtriangular.

Female unknown.

Discussion. Keilbachia flabellata  is similar to K. acamptochaeta  in having a completely one-segmented maxillary palpus, but otherwise the species are not especially similar. K. flabellata  is distinguished e.g. by having in the gonostylus five long curved megasetae instead of two short ones and by lacking strong megasetae between the curved ones and the apical tooth. The gonostylus of K. flabellata  is similar to that of K. flagria  from Nepal and there are no clear distinguishing characters. The tegmen of both species is also similar except that it is relatively longer in K. flagria  . K. flagria  differs by its three-segmented palpus and by having the whole length of r-m–bM setose instead of being non-setose but with a couple of setae on r-m near Rs.