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

Keilbachia flabellata sp. n.

( Figs 1 B, 3E, 4A, 7A–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.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. 4 A. Both wings lost in one of the paratypes. Length 1.67–1.95 mm. Width/length 0.42–0.48. R1/R 1.00. The meeting point of R1 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. 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. 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.

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 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 4. Wing, dorsal view. A, Keilbachia flabellata sp. n. (holotype). B, K. foveolata sp. n. (holotype). C, K. gigas sp. n. (holotype). D, K. rima sp. n. (paratype). Scale 1.0 mm.

FIGURE 7. Keilbachia flabellata sp. n. (A, B, and C paratypes, D holotype). A, C, part of hypopygium, ventral view. B, D, gonostylus, ventral view. Scale 0.10 mm.