Saigusaia aberrans Wu et Niu

Niu, Xiaoling, Wu, Hong & Yu, Xiaoxia, 2008, Four new species of Saigusaia Vockeroth, 1980 (Diptera: Mycetophilidae) from China, Zootaxa 1741, pp. 24-30 : 25-27

Saigusaia aberrans Wu et Niu , sp. nov.

( Figs. 1, 2 , 11 )

Description. MALE. Length: Body 4.21 mm; wing: 3.37 mm.

Head. Vertex and occiput blackish brown, with short and strong black setae. Eye: oval, with strong postocular bristles. Ocelli three, lateral ocellus separated from median ocellus by about 1 times its own diameter and from eye margin by about 1/2 time its own diameter diameter. Frons blackish brown, bare. Antenna: Scape, pedicel, flagellomeres 1 and 2 yellow, remainder of the flagellomeres brown; first flagellomere longer than others, about 2 times as long as wide; sixth flagellomere about 1.14 times as long as wide. Face: yellow, with scattered long setae; clypeus yellow, longer than head, with scattered short hairs; palpus yellowish, 5 segmented.

Thorax. Mesonotum blackish brown. Arostichals ending before 1/2 of mesonotum, a pair of pronotal bristles strong.Scutellum blackish brown, with 2 strong bristles. Mediotergite blackish brown, bare. Proepisternum, meskatepisternum, mesanepisternm brown, laterotergite blackish brown. Metepisternum brown.

Legs. Slender, predominantly yellow, ventral 1/4 of fore and mid trochanters, almost entire hind trochanters, basal 1/8 of hind femur brown. Leg ratios: t1: bt1= 1.56, t2: bt2=1.26, t3: bt3=1.85. Fore tibia with comb. Fore tibia with short bristles, mid tibia with four rows of long bristles and hind tibia with three rows of long bristles. The longest bristles about three times as long as tibial diameter. Tibial spurs yellow. Tarsal claws small. Empodia very small.

Wing. Slender, slight tapered apically, about 2.8 times as long as wide; deepened from 1/3 apical wing, Rs, R-stem, R1, R5, with dorsal setae. C slightly exceeding tip of R5, reaching to basal 1/4 point of wing margin between tips of R5 and M1. Point of furcation of CuA slight before base of r-m, Lengths of r-m 2.6 times as long as Rs, stem of Median fork 2.0 times s long as r-m. Halter yellowish, with scattered long hairs at base.

Abdomen. Densely clothed with long setae. Sternitebrown, bare. Tergites II–IV with broad yellow posteromarginal band, remainder of tergites darkish brown. Tergite VII about 1/2 as long as tergite VI, sternite VII about 2/3 as wide as tergite VII and slightly longer than tergite VII. Tergite VIII about 1/2 as long as tergite VII. Sternites II–VII with a pair of submedian fold lines and two pairs of sublateral fold lines. Tergite VIII only with submedian fold line.

Hypopgygium. Blackish brown. Tergite IX tapered apically, with more moderate setae and some strong long bristles apically; sharply deflexed, with broad rows and bearing more short spinose setae; ventral parts of tergite IX long and broad. Gonostylus produced into two lobes, lobes very thin and short, bare, slightly incurved, with more flattened and spine-like setae at apex; two strong and long black spines on dorsal surface beyond 1/2 of gonostylus.

Remarks. The shape of the wing is similar to S. cincta , but the shape of the tergite IX and the gonostylus are different from the other species of the Saigusaia .

Types. Holotypeɗ (ZJFC 010535) CHINA: Zhejiang, Songyang, Zhaoliaoxian Natural Reserve, 1000m, 23 August 2001, Huachao Xu, sweep net. Paratypes (ZJFC 0 10538, 010539), same place and date as the holotype; (ZJFC 910352, 910570), Fujian Wuyi Moutain National Natural Reserve, September 1989, Chi- Kun,Yang, sweep net.

Etymology. The species epithet derive from the Latin aberrans = aberrance, referring to this species different from the others of the genus from China.

Figures

FIGURES 1 – 9, Male genitalia. 1. S. aberrans, sp. n., dorsal view. 2, S. aberrans, sp. n., ventral view (ceri and proctiger omitted). 3, S. praegnans, sp. n., dorsal view. 4, S. praegnans, sp. n., ventral view (ceri and proctiger omitted). 5, S. monacanthus, sp. n., dorsal view. 6, S. monacanthus, sp. n., ventral view (ceri and proctiger omitted). 7, S. spinibarbis, sp. n., dorsal view. 8, S. spinibarbis, sp. n., ventral view (ceri and proctiger omitted). 9, S. taiwan, dorsal view. Scale bar = 0.10 mm.

FIGURES 10, 11 – 15. Male genitalia 10, S. taiwan, ventral view (ceri and proctiger omitted).. S. aberrans, sp. n., ventral view of tergite IX. 12, S. praegnans, sp. n., ventral view of tergite IX. 13. S. monacanthus, sp. n., ventral view of tergite IX. 14. S. spinibarbis, sp. n., ventral view of tergite IX. 15. S. taiwan, ventral view of tergite IX. Scale bar = 0.10 mm.