Corynoneura prolata Fu, 2020

Fu, Yue, Wang, Xin-Hua, Fang, Xiang-Liang, Xiao, Yun-Li, Fu, Jun & Lin, Xiao-Long, 2020, Corynoneura Winnertz (Diptera, Chironomidae, Orthocladiinae) from Zhejiang Province, China, Zootaxa 4890 (1), pp. 83-96 : 90-91

Corynoneura prolata Fu , sp. n.

Fig. 5

Type material. Holotype male (NKU: G5A6), CHINA: Zhejiang Province, Jinhua City, Pan’an County, Dapanshan Mountains , 120°31′30″E, 28°47′30″N, a.s.l. 800 m, 17–21.VII.2012, light trap, leg. Xiao-Long Lin.

Etymology. From Latin, prolatus, extended, elongated, referring to phallapodeme very long, extending beyond posterior margin of tergite IX.

Diagnostic characters. The male imago is characterized by having an antenna with ten flagellomeres, AR 0.36; superior volsella undeveloped, and inferior volsella absent; sternapodeme inverted V-shaped; phallapodeme very long, extending beyond posterior margin of tergite IX, strongly curved with projection for joint with sternapodeme placed pre-lateral.

Description. Adult male (n = 1).

Total length 1.17 mm.

Coloration. Head and thorax dark brown. Abdomen yellow brown.

Head. Antenna with ten flagellomeres, AR 0.36, ultimate flagellomere 98 µm long, ultimate flagellomere not expanded apically ( Fig. 5B ). Tentorium and cibarial pump as in Fig. 5C , tentorium 115 µm long; 15 µm wide. Anterior margin of cibarial pump concave. Length of palpomeres (in µm): 15; 13; 18; 20; 38. Palpomere 5/3 ratio: 2.1.

Thorax. Dorsocentrals 7. Scutellum with 2 setae.

Wing ( Fig. 5A ). VR 3.2. Cu/wing length 0.52; C 100 µm long; Cu 420 µm long; wing width/wing length: 0.42. Costa with 5 setae.

Legs. Fore legs and mid legs lost. Hind tibia expanded, with comb of 12 setae, one seta near spur strongly Sshaped. Lengths and proportions of legs as in Table 4.

Hypopygium ( Fig. 5 D–E). Tergite IX and laterosternites IX without long setae. Tergite IX medially incurved. Superior volsella undeveloped. Inferior volsella absent. Phallapodeme 63 µm long, strongly curved with projection for joint with sternapodeme placed pre-lateral, extending beyond posterior margin of tergite IX. Sternapodeme inverted V-shaped. Gonostylus strongly curved tapering, 28 µm long, with inner lobe in median part; megaseta 5 µm long. HR 2.43; HV 4.19.

Remarks. This species is similar to Corynoneura sorachibecea Sasa & Suzuki, 2001 by having an antenna with ten flagellomeres, inferior volsella absent, sternapodeme curved into V-shaped, and gonostylus with inner lobe in median part. The new species can be separated from the latter by having small AR 0.36 and phallapodeme extending beyond posterior margin of tergite IX in this species, while AR of 0.56–0.61, phallapodeme not extending beyond posterior margin of tergite IX in C. sorachibecea .

Figures

FIGURE 5. Corynoneura prolata sp. n., male imago. A. wing; B. Antenna; C. tentorium and cibarial pump; D. photo of hypopygium, dorsal view; E. hypopygium, ventral view.