Corynoneura sesquipedalis, Fu & Liu & Fang & Wang & Wang, 2018

Fu, Yue, Liu, Tian, Fang, Xiangliang, Wang, Qian & Wang, Xinhua, 2018, Three new species of Corynoneura Winnertz from Oriental China (Diptera: Chironomidae: Orthocladiinae), Zootaxa 4418 (1), pp. 85-92 : 88-89

Corynoneura sesquipedalis sp. n.

( Figs 2 A–F )

Type material. Holotype male, CHINA: Hubei Province, Enshi Tujia Miao Autonomous Prefecture, Hefeng County, Mulinzi National Nature Reserve , 110°12′4″E, 30°3′54″N, alt. 1228, 12.vii. 2015, sweep net, Y.Fu ( HBMY Type no .16011210w ).

Derivatio nominis. From Latin, sesquipedalis , excessively long, referring to attachment point placed at the bottom of lateral sternapodeme is very large and long, the length almost equal to coxapodeme.

Diagnostic characters. The male imago is characterized by having an antenna with 8 flagellomeres, AR 0.56; anterior margin of cibarial pump strongly concave; superior volsella undeveloped, and antero-medially fused; inferior volsella broad and developed, the junction of lateral edge and lower edge like right-angle, placed caudally of gonocoxite; transverse sternapodeme narrow and without oral projection; the attachment point placed at the bottom of lateral sternapodeme is very developed.

Male (n=1)

Total length 0.86 mm. Wing length 0.63 mm. Total length/wing length 1.38. Wing length/profemur length 3.2.

Coloration. Head dark–brown, with black eyes. Thorax dark– brown. Legs pale yellow. Abdomen brown.

Head. Antenna with 8 flagellomeres, AR 0.56, ultimate flagellomere 122 µm long, ultimate flagellomere slightly expanded apically, with about 10–12 apical sensilla chaetica ( Fig. 2. B ). Temporals absent. Tentorium, stipes and cibarial pump as in Fig. 2. C , tentorium 101 µm long; 12 µm wide; stipes 48 µm long, 3 µm wide. Anterior margin of cibarial pump ( Fig. 2. C ) strongly concave. Clypeus with 5 setae. Length of palpomeres (in µm): 7; 12; 14; 20; 41. Palpomere 5/3 ratio: 2.9.

Thorax. Dorsocentrals 5. Scutellum with 2 setae. Prealars invisible.

Wing ( Fig. 2. A ). VR 3.2. Cu/wing length 0.59; C 144 µm long; Cu 372 µm long; wing width/wing length: 0.40. Brachiolum without seta, costa with 4 setae.

Legs. Fore trochanter with dorsal keel. Spurs of fore tibia 19 µm long and 12 µm long, of mid tibia 12 µm long and 7 µm long, and spurs of hind tibia 29 µm long and 12 µm long. Width at apex of fore tibia 14 µm, of mid tibia 17 µm, of hind tibia (a) 26 µm. Width of hind tibia 1/3 from apex (d)17 µm, elongation length (b) 36 µm, length of maximum thickening (c1) 43 µm, total length of thickening (c2) 82 µm; a/d 1.5; b/d 2.1; c1/d 2.5; c2/d 4.8. Hind tibia expanded, with comb of 12 setae, one seta near spur strongly S–shaped ( Fig. 2. D ). Lengths and proportions of legs as in Table 2 .

Hypopygium ( Fig. 2. E–F ). Tergite IX and laterosternites IX without long setae. Tergite IX medially strongly concave, and pair of low caudal mounds with 2 setae on each side. Superior volsella undeveloped, and anteromedially fused. Inferior volsella broad and developed, posterior corner right-angled, with many glandular setae, along the inner margin of gonocoxite and placed caudally. Phallapodeme scalpel–like, slightly curved, 26 µm long, without obvious projection, and joint with sternapodeme placed pre–lateral. Transverse sternapodeme very narrow, approximately absent. Lateral sternapodeme with well developed attachment point, attachment point of phallapodeme with sternapodeme placed lateral sternapodeme. Gonostylus slightly curved tapering, 19 µm long, with 1 subapical setae; megaseta 3 µm long. HR 2.8; HV 4.5.

Distribution. The specimens were collected in subtropical areas in Hubei Province (Oriental China).

Remarks: The new species is similar to C. ascensa Fu et Saether 2012 , both species have large attachment point on lateral sternapodeme; superior volsella undeveloped, and antero-medially fused; but can be separated by the antenna with 8 flagellomeres, AR 0.56; tergite IX and laterosternites IX without long seta; transverse sternapodeme very narrow, approximately absent in C. sesquipedalis sp. n. while C. ascensa Fu et Saether 2012 has antenna with 10 flagellomeres, AR 0.35; tergite IX and laterosternites IX with 2 long setae on each side; transverse sternapodeme obviously present.

Adult female, pupa and larva: unknown.

Figures

FIGURE 2 A–F. Corynoneura sesquipedalis sp. n. Male imago.A. Wing.B. Antenna. C. Tentorium, stipesand cibarial pump. D. Hind tibial apex.E. Hypopygium, dorsal view.F. Hypopygium, ventral view.

Tables

TABLE 2. Lengths (in µm) and proportions of legs segments of male C. sesquipedalis sp. n. (n=1)

	fe	ti	ta1	ta2	ta3	ta4
p1	194	233	113	65	31	11
p2	274	245	137	67	36	19
p3	214	226	120	70	29	19