Keilbachia orthonema Hippa & Vilkamaa

Zhang, Su-Jiong, Huang, Junhao, Wu, Hong & Wang, Yi-ping, 2010, The genus Keilbachia Mohrig from Mainland China, with descriptions of two new species (Diptera, Sciaridae), ZooKeys 52, pp. 47-56 : 48

Keilbachia orthonema Hippa & Vilkamaa

Keilbachia orthonema Hippa & Vilkamaa, 2007b: 66.

Diagnostic characters.

(Male). Body length 1.76-1.82 mm; wing length 1.35-1.37 mm.

Eye bridge 3-4 facets wide. Prefrons with 9-11 setae. Length/width of 4th flagellomere 2.47-2.53.

Anterior pronotum with 4-5 setae. Episternum 1 with 5-6 setae.

Length of spur/width of protibia 1.76-1.81. c/w 0.79-0.82, R1/R 0.71-0.73, r-m with 0-1 seta.

The mesial megaseta on gonostylus short and straight, slightly longer than its basal body. Two slender megasetae at apical forth of gonostylus. Tegmen slightly broader subbasally than subapically.

Specimens examined.

China, Yunnan, Yingjiang, Tongbiguan, 24°36.004'N; 97°39.139'E, sweep-net, 20.V.2009. 6 males, Su-Jiong Zhang [SM00657-00658, SM00663-00664, SM00670, SM00680] (ZAFU); 3 males, Man-Man Wang [SM00653, SM00666-00667] (ZAFU).

Distribution.

China (Yunnan), Malaysia.

Biology.

Unknown.

Remarks.

This species is new to China, which was firstly described from Sabah, Malaysia, based on two male specimens. It is similar to Keilbachia apprima Vilkamaa, Komarova & Hippa, 2006 from Vietnam by sharing a short mesial megaseta ( Hippa and Vilkamaa 2007b), but Keilbachia orthonema can be distinguished by mesial megaseta longer and much less curved, and apical forth of gonostulus with two slender megasetae. The Chinese material examined does not show distinct intraspecies variation, but the two megasetae at the apical forth of the gonostylus are stronger than in Malaysia materials, judging from the figures prepared by Hippa and Vilkamaa (2007b). What’s more, length/width of 4th flagellomere is 2.47-2.53, smaller than in Malaysia materials, which is about 3 times as long as wide.