Saigusais spinibarbis 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 : 29-30

Saigusais spinibarbis Wu et Niu , n.sp.

( Figs 7, 8 , 14)

Description. MALE. Length: Body: 4.25mm; Wing: 3.90mm.

Head. Vertex and occiput blackish brown, with short black setae. Eye: oval, with strong postocular bristles. Ocelli three, lateral ocellus separated from median ocellus by about 1.5 times its own diameter and from eye margin by ca. 0.5 about own diameter. Frons blackish brown. Antenna: scape and pedicel brown. Fagellum: first flagellomere yellowish at extreme base, remainder of the flagellomere brown. First flagellomere and sixth flagellomere 3 times as long as wide, Face: brown, with more long hairs. Clypeus: yellow, longer than the head, with short scattered hairs; Palpus: yellowish, 5 segmented.

Thorax. Mesonotum blackish brown, Arostichals ending before middle of mesonotum, pair of pronotal bristles strong. Scutellum blackish brown, with 2 strong bristles. Mediotergite, blackish brown, bare. Proepisternum brown, with some long and strong bristles. Mesanepisternum, meskatepisternum brown. laterotergite blackish brown. Metepisternum brown.

Legs. Slender, predominantly yellow, ventral 1/3 of fore trochanter, entire mid and hind trochanters, ventral of 1/10 median and hind femora darkish brown at apex. Leg ratios: 1:bt1= 1.80, t2:bt2=1.26, t3:bt3=1.71.Fore tibia with comb. Fore tibia with short bristles, mid tibia with three rows of long bristles and hind tibia with two rows of long bristles. Longest bristles are about three times as long as tibial diameter. Tibial spurs yellow. Tarsal claws small. Empodia very small.

Wing. Hyaline, slender, 2.8 times as long as wide. R-stem, R1, R5, almost of M1, apical 2/3 of M2, apical 2/ 3 of CuA1, apical 1/3 of l CuA2 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 beyond base of r-m, Lengths of r-m 2 times as long as Rs, stem of Median fork 3.2 times long as r-m. Halter yellowish, with scattered and long hairs at base.

Abdomen. Clothed with dense long setae. Sternite I brown, bare. Tergites II–IV with narrow yellow posteromarginal band, remainder of tergites darkish brown. Tergite VII and sternite VII about 3/4 as long as sclerites of segment VI. Tergites VIII about 1/2 as long as tergite VII. Sternites II–VII each with median and two pairs of sublateral fold-lines. Sternite VIII with median fold-line. Tergite VIII about 3/4 as long as tergite VII, sternite VIII about 2 times as long as tergite VIII.

Hypopgygium. Black, Tergite IX weakly broadened apically, with more setae and several more strong and long bristles apically. Posteromarginal portion of epandrium bent downwards ventrally and with two narrow rows of short and strong setae. Gonostylus incurved, slightly peaked apically, a small lamellate edge on dorsoinner margin at 1/2 apical of gonostylus and with two rows of short spine-like setae.

Remarks. This species is closest to S. taiwan from Taiwan , but can be distinguished by the hairs on the wing (almost of M1, apical 2/3 of M2, apical 2/3 of CuA1, apical 1/3 of CuA2 with dorsal setae), but hairs of S. taiwan (M1 and apical /2 of each M2, CuA1, CuA2 with dorsal setae) is different. Two rows of short spinulose setae (normal short hairs in S. taiwan ) on the dorsal of infero-anterior of gonostylus are good characters to distinguish S. taiwan from other species of Saigusaia Vockeroth.

Types. Holotype (ZJFC 982423) CHINA: Zhejiang Qingliang Montain National Natural Reserve, 1000m, 11 May 2007, Xiaoling Niu, sweep net. Paratypes (ZJFC 0 70409, 0 70411, 070413), same place and date as the holotype.

Etymology. The species epithet derive from the Latin spinibarbis = spine-like hairs, referring to spinelike setae on the gonostylus.

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.