Keilbachia bicuspis, 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 : 39

Keilbachia bicuspis sp. n.

( Figs 1 F, 2A, 3H, 5D, E)

Material studied. Holotype male (in NRMS). N.E. Burma ( Myanmar), Kambaiti, 7000 ft., 15.4.1934, R. Malaise.

Male. Colour. The specimen is strongly faded, almost unicolorous pale yellowish-brown. Head. Eye bridge 3 facets wide. Face (prefrons) with 5 setae in a transverse row. Clypeus with 1 seta. Maxillary palpus ( Fig. 1 F) with three palpomeres. Palpomere 1 with one seta, with numerous hyaline sensilla widely scattered on dorsal surface, no sensory pit; palpomere 2 with ca. 7 setae; palpomere 3 with ca. 7 setae. Antennal flagellomere 4, Fig. 2 A. Thorax. Number of setae on anterior pronotum and episternum 1 not counted because the sclerites are badly damaged in the single specimen. Wing. Length 2.7 mm. Width/length 0.42. R1/R 1.21. c/ w 0.79. r-m and bM equal in length, r-m/bM 1.00, both non-setose. Legs. Apex of fore tibia, Fig. 3 H. Length of fore basitarsomere/length of fore tibia 0.79. Length of fore tibia/length of fore femur 1.48. Length of hind tibia/length of scutum+scutellum not counted because the thorax is distorted. Abdomen. Sternite 8 with ca. 20 setae, widely spread. Hypopygium. Fig. 5 D, E: Gonostylus with two rather short arcuate mesial megasetae arising from a common basal body and one megaseta at the base of the apical tooth. Tegmen laterally compressed so that the sides partly cover each other, and many of the details difficult to interpret.

Female unknown.

Discussion. Keilbachia bicuspis is not especially similar to any other Keilbachia . It is one of the five species with only two curved megasetae on the gonostylus, the other four being K. acamptochaeta , K. biflagrispina , K. oligonema and K. sp. 2. K. bicuspis differs from all of these except for K. acamptochaeta by having the curved megasetae short and stout, only about twice the length of their basal body instead of being several times longer than the basal body. K. bicuspis differs from K. acamptochaeta by having only one megaseta in addition to the curved ones on its gonostylus, whilst in K. acamptochaeta there are three. K. bicuspis differs further by having maxillary palpus three-segmented, not one-segmented.

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 5. Eye bridge, frontal view (A), and part of hypopygium (B, D) and gonostylus (C, E), ventral view. A, B, C, Keilbachia acamptochaeta sp. n. (holotype). D, E, K. bicuspis sp. n. (holotype). Scale 0.10 mm.