Paratrichocladius comptus, Fu, Yue, Saether, Ole A. & Wang, Xinhua, 2012

Fu, Yue, Saether, Ole A. & Wang, Xinhua, 2012, A review of Paratrichocladius Santos Abreu from the Sino-Indian Region (Diptera: Chironomidae: Orthocladiinae), Zootaxa 3478, pp. 453-482 : 461-463

Paratrichocladius comptus sp. n.

( Fig. 5 A–F)

Type material. Holotype male, (BDN No. 21412), CHINA: Xinjiang Autonomous Region, Aketao County (39°52’ N, 76°40’ E), alt. 1317 m, 19. viii. 2002, Hongqu Tang.

Diagnostic characters. The adult male can be separated from other members of the genus by having no humeral pit; only 4 dorsocentrals; LR1 of 0.68; tergite I with only 2 setae, tergite II without long setae, other tergites with few long setae. This species is similar to P. mongolseteus Sasa et Suzuki, 1997 in the high antennal ratio and the shape of the inferior volsella, but can be separated by the hind tibia with three strong spurs and without normal comb; inferior volsella dark in color and without semitransparent margins; gonostylus with high and apically expanded crista dorsalis.

Etymology. From Latin, comptus , comb, referring to hind tibia without normal comb.

Description. Adult male (n = 1)

Total length 3.25 mm. Wing length 2.05 mm. Total length / wing length 1.6. Wing length / length of profemur 2.8.

Coloration. Head dark brown, palp and antenna brown. Thorax dark brown. Legs brown. Abdominal dark brown in the median longitudinal part, yellow brown on the lateral margins.

Head. AR 3.1, ultimate flagellomere 830 µm long, with groove from the fifth flagellomere, apex without sensilla chaetica. Temporal setae 3, including 3 inner verticals. Clypeus invisible. Tentorium 155 µm long, 35 µm wide. Stipes 75 µm long, 8 µm wide. Palpomeres length (in µm): 20, 60, 78, 80, 98. Palpomere 5/3 1.3.

Wing ( Fig. 5 A). Squama with 26 fringe hairs, Brachiolum with 1 seta, R with 3 setae. Costal extension 15 µm long. VR 1.2. Cu length 950 µm. Cu/ wing length 0.46. Wing width/ wing length 0.26.

Thorax ( Fig. 5 B). Dorsocentrals 4, acrostichals more than 5, humerals 3, prealars 3. Scutellum with 8 setae. Humeral pit absent.

Legs. Spur of fore tibia 65 µm long; spurs of mid tibia 38 µm and 28 µm long; of hind tibia 63 µm, 35 µm and 8 µm long. Apex of hind tibia with three spurs and four strong setae instead of the normal comb ( Fig. 5 C). Width at apex of fore tibia 43 Μm, of mid tibia 40 Μm, of hind tibia 50 Μm. Lengths and proportions of legs as in Table 4.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 720 840 570 400 255 170 140 0.68 2.2 2.7 2.4 p2 720 800 690 240 175 130 125 0.86 3.0 2.2 3.0 p3 740 1000 520 310 250 150 145 0.52 2.6 3.3 3.8 Abdomen ( Fig. 5 D). With some pale spots on each lateral side. Setae on tergite I–VI as illustrated. Hypopygium ( Fig. 5 E–F). Laterosternite IX with 4 long setae. Phallapodeme 100 Μm long; transverse sternapodeme 98 Μm long, with oral projections. Gonocoxite 250 Μm long; with many long setae. Superior volsella small and rounded. Inferior volsella rounded, with 8 long marginal setae. Gonostylus 110 Μm long, with high crista dorsalis. Megaseta 10 µm long. HR 2.3, HV 3.0.

Distribution. The specimen were collected in Xinjiang Autonomous Region, Palaearctic China.

Figures

FIGURE 5. Paratrichocladius comptus sp. n., male. A— Wing. B— Notum. C— Apex of hind tibia. D— Tergites I – VI. E— Hypopygium, dorsal view. F— Hypopygium, ventral view.