Corynoneura recta 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 : 92-93

Corynoneura recta Fu , sp. n.

( Fig. 6 )

Type material. Holotype male (NKU: A13I58), CHINA: Zhejiang Province, Hangzhou City, Changhua County, Qingliangfeng National Nature Reserve , 121°9′53″E, 30°17′49″N, a.s.l. 1100–1400 m, 12.V.2012 – 20.VI.2012, malaise trap, leg. Rui Guo.

Etymology. From Latin, rectus, straight, upright, referring to the inferior volsella with a right-angled corner.

Diagnostic characters. The male imago is characterized by having an antenna with eight flagellomeres, AR 0.47; superior volsella separated, like rounded corner. Inferior volsella broad, with right-angle corner, along the inner margin of gonocoxite and placed medially.

Description. Adult male (n = 1).

Total length 1.0 mm. Wing length 0.63 mm. Total length/wing length 1.58. Wing length/profemur length 2.84.

Coloration. Head and thorax dark brown. Legs yellowish. Abdomen yellow-brown.

Head. Antenna with eight flagellomeres, AR 0.47, ultimate flagellomere 123 µm long, ultimate flagellomere slightly expanded apically, with about 10 apical sensilla chaetica ( Fig. 6D ). Tentorium and cibarial pump as in Fig. 6B , tentorium 125 µm long; 13 µm wide. Anterior margin of cibarial pump ( Fig. 6B ) strongly concave. Length of palpomeres (in µm): 15; 13; 15; 20; 38. Palpomere 5/3 ratio: 2.5.

Thorax ( Fig. 6E ). Dorsocentrals 4. Scutellum with 2 setae. Prealars 1.

Wing ( Fig. 6A ). C 170 µm long; wing width/wing length: 0.42. Costa with 7 setae.

Legs. Fore trochanter with dorsal keel. Spurs of fore tibia 15 µm long, spur of hind tibia 13 µm long and 25 µm long. Width at apex of fore tibia 23 µm, of hind tibia (a) 18 µm. Width of hind tibia 1/3 from apex (d) 18 µm, elongation length (b) 37 µm, length of maximum thickening (c 1) 50 µm, total length of thickening (c 2) 75 µm; a/d 2.06; b/d 2.06; c 1 /d 2.78; c 2 /d 4.17. Hind tibia expanded, with comb of 18 setae, one seta near spur strongly S-shaped ( Fig. 6C ). Lengths and proportions of legs as in Table 5.

Hypopygium ( Fig. 6 F-H). Tergite IX and laterosternite IX without long setae. The margin of tergite IX straight, medially not curved. Superior volsella anteromedially separated, like rounded corner. Inferior volsella broad, with many glandular setae and right-angle corner, along the inner margin of gonocoxite and placed medially. Phallapodeme apical slightly curved, 38 µm long, joint with sternapodeme placed caudally. Transverse sternapodeme 15 µm wide. Small attachment point of lateral sternapodeme with phallapodeme placed and directed caudally. Gonostylus slightly curved tapering, 25 µm long, megaseta 3 µm long. HR 2.52; HV 4.0.

Remarks. The new species is similar to Corynoneura tertia Makarchenko et Makarchenko, 2010 by having antenna with 8 flagellomeres, sternapodeme curved into a U-shape, and phallapodeme low, join with sternapodeme placed caudally. The new species can be separated from the latter by the phallapodeme being slightly curved, the inferior volsella broad with a right-angled corner, while in C. tertia the phallapodeme is relatively longer and obviously curved, the inferior volsella is long and narrow as is the inner margin of the gonocoxite.

Figures

FIGURE 6. Corynoneura recta sp. n., male imago. A. wing; B. tentorium and cibarial pump; C. hind tibial apex; D. antenna; E. thorax; G. hypopygium, dorsal view; F & H. hypopygium, ventral view.