Corynoneura incuria Fu, 2022

Fu, Yue, Fang, Xiang-Liang, Wang, Xin-Hua, Shen, Mi & Xiao, Yun-Li, 2022, Corynoneura Winnertz species from Hunan Province, Oriental China, delineated with morphological and 16 S rDNA data (Diptera, Chironomidae), ZooKeys 1082, pp. 87-102 : 87

Corynoneura incuria Fu sp. nov.

Figures 3 , 4

Type material.

Holotype male (HNU: 17090903HJL), China: Hunan Province, Huaihua City, Hecheng County, Wushui River, Xiyi Bridge, 29°33'29"N, 109°57'41"E, 259 m a. s. l., 23.VII.2016, light trap, leg. Jingli Huang. Paratype: 1 female (HNU:17091205HJL), CHINA: Hunan Province, Loudi City, Xinhua County, Xihe Town, Cushi Village, 27°51'45"N, 111°31'51"E, 315 m a. s. l., 29.Ⅶ.2016, sweep net, leg. Jingli Huang.

Etymology.

From Latin, Corynoneura incuria , neglect, referring to the inferior volsella being absent and fused with the inner margin of gonocoxite.

Diagnostic characters.

The male imago is characterized by having antenna with eleven flagellomeres, AR 0.31; anterior margin of cibarial pump strongly concave; superior volsella developed and with right-angled corner; inferior volsella almost absent, fused with the inner margin of gonocoxite; transverse sternapodeme curved into U-shaped; phallapodeme scalpel-like, apical slightly curved, placed caudal position of sternapodeme. The female imago is characterized by coxosternapodeme with a single transparent, well-developed lamella.

Description.

Ault male (N = 1). Total length 1.08 mm. Wing length 0.63 mm. Total length/wing length ratio 1.70.

Coloration. Head and thorax brown, eyes dark brown. Legs pale yellow. Abdominal tergites I-V yellowish, VI-IX yellow-brown.

Head. Antenna with eleven flagellomeres, AR 0.31, ultimate flagellomere 96 µm long, slightly expanded apically, with many apical sensilla chaetica (Fig. 3C ). Tentorium and cibarial pump as in Figure 3B , tentorium 120 µm long; 12 µm wide. Anterior margin of cibarial pump strongly concave. Palpomeres lost.

Thorax (Fig. 3E ). Five dorsocentral setae. Scutellum with two setae.

Wing (Fig. 3A ). VR 3.2. Cu/wing length ratio 0.52; Costa 175 µm long, with five setae; Cu 245 µm long; wing width/wing length ratio 0.49.

Legs. Fore trochanter with dorsal keel. Spurs of fore tibia 12 µm long and 7 µm long, spurs of mid tibia 7 and 9 µm long, and spurs of hind tibia 31 µm long and 10 µm long. Width of fore tibia at apex 17 µm, of mid tibia 17 µm, of hind tibia (a) 36 µm. Width of hind tibia 1/3 from apex (d) 19 µm, elongation length (b) 38 µm, length of maximum thickening (c1) 60 µm, total length of thickening (c2) 103 µm; hind tibial ratios: a/d 1.89; b/d 2.00; c1/d 3.16; c2/d 5.42. Hind tibia expanded, with comb of 16 setae, with S-shaped spur (Fig. 3D ). Lengths and proportions of legs as in Table 3 .

Hypopygium (Fig. 3F-G ). Tergite IX very developed, almost covering the gonocoxite, medially distinctly incurved. Superior volsella with right-angled corner and triangle, and anteromedially separated. Inferior volsella fused with inner margin of gonocoxite bearing many glandular setae. Phallapodeme scalpel-like, apex slightly curved, 31 µm long, and joined with sternapodeme placed caudally. Transverse sternapodeme 14 µm wide, inverted U-shaped with small oral projection, lateral sternapodeme with small attachment point placed and directed caudally. Gonostylus curved, tapering, 23 µm long; megaseta 4 µm long. HR 2.77; HV 4.15.

Adult female (N = 1). Total length 0.83 mm. Wing length 0.59 mm. Total length/wing length ratio 1.41. Wing length/profemur length ratio 3.61.

Coloration. Head, eyes, and thorax brown. Legs pale yellow. Abdomen yellowish brown.

Head. Tentorium 72 µm long; 7 µm wide. Clypeus with four setae.

Thorax (Fig. 4C ). Five dorsocentral setae. Scutellum with two setae. Two prealar setae.

Wing (Fig. 4A ). Wing broader than in male. VR 2.5. Cu 305 µm long; Cu/wing length ratio 0.52; C 265 µm long; C/wing length ratio 0.45; wing width/wing length ratio 0.49. Costa with 13 setae.

Legs. Fore trochanter with dorsal keel. Spurs of fore tibia 10 µm long, spurs of mid tibia 7 and 12 µm long, and spurs of hind tibia 22 µm and 12 µm long. Width fore tibia at apex of 17 µm, of mid tibia 14 µm, of hind tibia (a) 29 µm. Width of hind tibia 1/3 from apex (d) 22 µm, elongation length (b) 31 µm, length of maximum thickening (c1) 60 µm, total length of thickening (c2) 96 µm; hind tibial ratios: a/d 1.32; b/d 1.41; c1/d 2.72; c2/d 4.36. Hind tibia expanded, with comb of 14 setae, with S-shaped spur (Fig. 4B ). Lengths and other proportions of legs as in Table 4 .

Genitalia (Fig. 4D ). Tergite IX without long caudal setae. Cercus 26 µm long, 23 µm wide. Notum length 96 µm. Coxosternapodeme with a single transparent well-developed lamella. Seminal capsule 40 µm long, neck 8 µm long, 6 µm wide.

Remarks.

This species is closely related to Corynoneura tokarapequea Sasa & Suzuki, 1995 by having antenna with eleven flagellomeres, the same shaped sternapodeme and phallapodeme, and a similar gonostylus. The new species can be separated from the latter by having AR 0.31, the inferior volsella almost absent and fused with the inner margin of the gonocoxite, while C. tokarapequea has AR 0.62-0.70, the inferior volsella obvious and near rectangular. The new species is also similar to Corynoneura floridaensis Fu & Sæther, 2012 by the antenna with eleven flagellomeres, AR 0.36, same shaped sternapodeme and phallapodeme, but differs from the latter by having a thick transverse sternapodeme, and the gonostylus is strongly curved in C. floridaensis .

Figures

Figure 3. Corynoneura incuria sp. nov., male imago. A wing B tentorium and cibarial pump C antenna D legs E thorax F hypopygium, dorsal view G hypopygium, ventral view.

Figure 4. Corynoneura incuria sp. nov., female imago. A wing B hind tibial apex C thorax D genitalia.