Keilbachia rima, 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 : 47

Keilbachia rima sp. n.

( Figs 1 G, 2E, 3C, 4D, 10A–F)

Material studied. Holotype male (in NRMS). N.E. Burma ( Myanmar), Kambaiti, 7000 ft., 1.6.1934, R. Malaise. Paratypes. 2 males with same data as holotype but dated 2.5. (in BMNH) and 23.5. (in NRMS). Additional material. 1 male with same data as holotype but dated 29.5. (in NRMS).

Male. Colour. Head brown, maxillary palp and antenna slightly paler than other parts, thorax brown with an indistinct and indefinite pattern of paler brown areas on pleura, legs pale brown, paler than the paler areas on thorax, wing brownish, haltere pale brown, paler than wing, abdomen pale brown, like the paler areas on thoracic pleura. Head. Eye bridge ( Fig. 10 A): 2–4 facets wide, in the holotype ( Fig. 10 A) the medial facetless area is narrower than in the paratypes ( Fig. 10 B). Face (prefrons) with 13–15 setae. Clypeus with 2–3 setae. Maxillary palpus ( Fig. 1 G) with 3 palpomeres. Palpomere 1 with 1–2 setae, one lateral, the other placed either dorsally or mesio-ventrally, with many hyaline sensilla scattered on dorsal surface, without sensory pit. Palpomere 2 with 5–7 setae. Palpomere 3 with 5–9 setae. Antennal flagellomere 4, Fig. 2 E. Thorax. Anterior pronotum with 2–4 setae. Episternum 1 with 6–7 setae. Wing ( Fig. 4 D). Length 2.30–2.35 mm. Width/length 0.45–0.49. R1/R 1.28–1.34. c/ w 0.76 –0.77. r-m slightly shorter or longer than bM, r-m/bM 0.82–1.13, r-m with 1–2 setae, bM non-setose. Legs. Apex of fore tibia, Fig.3 C. Length of fore basitarsomere/length of fore tibia 0.59–0.64. Length of fore tibia/length of fore femur 1.39–1.42. Length of hind tibia/length of scutum+scutellum 1.92–2.05. Abdomen. Sternite 8 with ca. 10 setae, most of them in a transverse row on posterior part but with two or three placed more anteriorly. Hypopygium. Fig. 10 : Gonostylus with 3–4 long curved mesial megasetae arising from a common basal body and 3 megasetae in a row between these and the apical tooth, the most apical one of these at the base of the apical tooth. Tegmen rather simple, broadly subtriangular, in one of the paratypes with a thick papillose membrane basolaterally ( Fig. 10 F), which cannot be seen in the other specimens.

Female unknown.

Discussion. The holotype and the paratypes differ slightly in the eye bridge. In the former the facetless medial space is narrow, as it usually is in Keilbachia , but in the paratypes it is broad, about the diameter of two facets wide, and resembles K. foveolata . K. rima is otherwise also similar to K. foveolata . For distinguishing characters, see under the latter.

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 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 10. Keilbachia rima sp. n. (A, C, holotype, B, D, E paratypes). A, B, eye bridge, frontal view. C, part of hypopygium, ventral view. D, gonostylus, ventral view. E, mesial side of gonostylus, ventral view. F, medial part of hypopygium, ventral view. Scale 0.10 mm.