Paratrichocladius ternarius, 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 : 472

Paratrichocladius ternarius sp. n.

( Fig. 10 A–F)

Type material. Holotype male, CHINA: Sichuan Province, Kangding County, Wasigou (30°03’ N, 101°57’ E), alt. 3700 m, light trap, 15. vi. 1996, Xinhua Wang (BDN No. 13086).

Diagnostic characters. The adult male is unique in having three palpomeres and a narrow inferior volsella. Humeral pit rounded; gonostylus slender and with a small triangular crista dorsalis.

Etymology. From Latin, ternarius , containing of three of anything, referring to the palp with only three palpomeres.

Description. Male (n = 1)

Total length 3.01 mm. Wing length 1.68 mm. Total length/wing length 1.8. Wing length / length of profemur 2.8.

Coloration. Head brown, palp and antenna yellow–brown. Thorax dark brown. Legs brown. Abdominal brown.

Head. AR 1.2, ultimate flagellomere 360 µm long, with groove from the seventh flagellomere, apex without sensilla chaetica. Temporal setae 5, including 2 inner verticals, 3 outer verticals. Clypeus with 12 setae. Tentorium 145 µm long; 38 µm wide. Stipes 135 µm long, 8 µm wide. Palpomeres ( Fig. 10 B) length (in µm): 33, 38, 145.

Wing ( Fig. 10 A). Squama with 8 setae, R with 5 setae. Costal extension 20 µm long. VR 1.0. Cu length 650 µm. Cu/ wing length 0.39. Wing width/ wing length 0.32.

Thorax ( Fig. 10 C). Dorsocentrals 14, acrostichals more than 6, prealars 3. Scutellum with 6 setae.

Legs. Spur of fore tibia 48 µm long, spurs of mid tibia 23 µm and 17 µm long, of hind tibia 45 µm long. Hind tibial comb with 10 setae. Width at apex of fore tibia 50 Μm; of mid tibia 38 Μm; of hind tibia 43 Μm. Sensilla chaetica 6 on ta1 of P3. Lengths and proportions of legs as in Table 6.

fe ti ta1 ta2 ta3 ta4 ta5 LR BV SV BR p1 600 760 440 270 155 140 90 0.58 2.7 3.1 1.6 p2 640 630 300 165 130 90 85 0.48 3.3 4.2 2.2 p3 610 700 400 215 150 100 90 0.57 3.1 3.3 2.5 Abdomen ( Fig. 10 D). Setae on tergites I–VI as illustrated.

Hypopygium ( Fig. 10 E–F). Laterosternite IX with 6 long setae. Phallapodeme 60 Μm long; transverse sternapodeme 105 Μm long, with oral projections. Gonocoxite 158 Μm long; with many long setae. Superior volsella small and rounded. Inferior volsella narrow, with many long marginal setae. Gonostylus 75 Μm long, with small triangular crista dorsalis. Megaseta 10 µm long. HR 2.1, HV 4.1.

Comments. The ultimate palpomere carries several apical setae and shows a weak lateral notch indicating that it consists of two fused palpomeres. The second palpomere seems to have one indistinct sensilla clavata normally found on the third palpomere. The number of palpomeres thus is not a result of loss of the apical two palpomeres. The two palps are nearly identical and the reduction thus unlikely to be an abnormality.

Distribution. The specimen was collected in Sichuan Provinces, Oriental China.

Figures

FIGURE 10. Paratrichocladius ternarius sp. n., male. A— Wing. B— Palpomeres. C— Notum. D— Tergites I – VI. E— Hypopygium, dorsal view. F— Hypopygium, ventral view.