Corynoneura porrecta, Fu & Saether, 2012

Fu, Yue & Saether, Ole A., 2012, 3536, Zootaxa 3536, pp. 1-61 : 41-44

Corynoneura porrecta sp. n.

( Figs 20 A–G)

? Corynoneura sp. A : Saether 1977 fig. 61D, E.

Type material: Holotype male, CANADA: Lake Winnipeg , Victoria Beach, light trap, 9.vii.1969, P.S.S. Chang ( CNC) . Paratypes: 2 females as holotype; 1 male as holotype except for 25.vii.1969; Lake Winnipeg , 5 km off Selkirk (Horse) Island , 1 male, 25.vii.1969, P.S.S. Chang ( ZMBN) .

Etymology. From Latin, porrectus, spread out, extended, referring to the strongly protruding inferior volsella.

Diagnostic characters. The adult male is characterized by the wing length of 0.71–0.87 mm, AR of 0.5–0.6, 10 flagellomeres with "normal" whorl of setae, shortened palp, phallapodeme attached laterally on sternapodeme, and both superior and inferior volsella strongly protruding. The female apparently lacks sensilla chaetica, lacks setae on gonocoxite IX, has 6–8 setae on tergite IX, and 8–9 well developed lateral lamellae on the coxosternapodeme. The species is very closely related to C. edwardsi Brundin ( Schlee 1968: 31) but differs in the smaller size, lower AR, more numerous setae on tergite IX, more projecting inferior volsella, and differentlyshaped inferior and superior volsella. The short palpal segments of the male together with 10 flagellomeres with "normal" whorl of setae will probably also separate this species.

Male (n = 2–3)

Total length 1.19–1.45 mm. Wing length 0.71–0.87 mm. Total length/wing length 1.64–1.70. Wing length/ profemur length 2.94–3.16.

Coloration. Brownish black, with brown legs and basal part of tarsi slightly lighter.

Head. AR 0.52–0.58. Ten distinct flagellomeres, longest antennal seta 220–240 µm. Sensilla chaetica and shape of ultimate flagellomere as in C. edwardsi Brundin ( Schlee 1968: fig. 127). Temporals absent. Clypeus with 9–10 setae. Cibarial pump, tentorium and stipes as in Fig. 20 A. Palp reduced, palpomere lengths (in µm): 10–13, 18–22, 27, 30–33, 50–51.

Thorax ( Fig. 20 B). Antepronotum with 2 setae. Dorsocentrals 5–6, prealars 2. Scutellum with 2 setae. Anapleural suture 97–104 µm long.

Wing. VR 2.10–2.16. C 216–272 µm long, C/wing length 0.30–0.32, Cu/wing length 0.62–0.63. Brachiolum with 1 seta.

Legs. Spur of fore tibia 22–25 µm, spurs of mid tibia 10–12 and 10 µm, and of hind tibia 35–40 and 8–10 µm. Width at apex of fore tibia 23–25 µm, of mid tibia 20–25 µm, and of hind tibia (a) 40–42 µm. Width of hind tibia 1 / 3 from apex (d) 25 µm, elongation length (b) 33–37 µm, length of maximum thickening (c 1) 55–65 µm, total length of thickening (c 2) 110–116 µm; a/d 1.60–1.68, b/d 1.32–1.48, c 1 /d 2.20–2.60, c 2 /d 4.40–4.64. Hind tibia ( Fig. 20 C) expanded, with a slightly S-shaped and relatively short apical seta, and comb with 17–19 setae, shortest seta 13–18 µm, longest seta 22 µm. Sensilla chaetica absent. Lengths of leg segments and their proportions as in Table 19.

Hypopygium ( Fig. 20 D–E). Tergite IX with 9–12 setae; laterosternite IX with 2–3 setae. Phallapodeme 70–80 µm long, attached laterally to sternapodeme. Superior volsella tongue-shaped, strongly projecting together with basal lobe. Gonocoxite 100–120 µm long, gonostylus 50–57 µm long. HR 1.74–2.00, HV 2.08–2.38.

Female (n = 1–2)

Total length 1.23–1.24 mm. Wing length 0.69–0.79 mm. Total length/wing length 1.55–1.79. Wing length/ profemur length 3.44–3.49.

Coloration. Yellowish brown with blackish brown vittae, scutellum, postnotum, preepisternum and abdomen. Femora, tibiae, apices of ta 1 –ta 4 and ta 5 dark brown; remaining part of tarsi pale.

Head. AR 0.38–0.45. Flagellomeres lengths (in µm): 38–42, 30–33, 29–33, 28, 48–56. Temporals absent. Clypeus with 8–9 setae. Tentorium 70–100 µm long. Stipes 50 µm long. Palpomere lengths (in µm): 11–12, 16–22, 14–18, 31–36, 45–55.

Thorax. Antepronotum with 1 seta. Dorsocentrals 7–8, prealars 2. Scutellum with 2 setae. Anapleural suture 95–96 µm long.

Wing. VR 3.00–3.25. C 362–380 µm long, C/wing length 0.48–0.52, Cu/wing length 0.60–0.64. Brachiolum with 1 seta.

Legs. Spur of fore tibia 14 µm, spurs of mid tibia 12–20 and 10–14 µm, and of hind tibia 33–39 and 7–10 µm. Width at apex of fore tibia 22 µm, of mid tibia 20–24 µm, and of hind tibia (a) 34–35 µm. Width of hind tibia 1 / 3 from apex (d) 18–21 µm, elongation length (b) 27–32 µm, length of maximum thickening (c 1) 49–54 µm, total length of thickening (c 2) 66–80 µm; a/d 1.62–1.92, b/d 1.50–1.52, c 1 /d 2.57–2.72, c 2 /d 3.67–3.81. Hind tibia expanded, with a comb of 14 setae, shortest seta 14–22 µm, longest seta 23–30 µm. Sensilla chaetica absent. Lengths of leg segments and their proportions as in Table 20.

Genitalia ( Fig. 20 F–G). Cercus 31–36 µm long. Gonocoxite IX with 1–2 setae. Tergite IX with 6–8 setae. Notum 70–80 µm long. Coxosternapodeme with 8–9 lateral lamellae. Seminal capsule 60–70 µm long, 48–50 µm wide.

Remarks. The female illustrated by Saether (1977: fig. 61D, E) as Corynoneura sp. A probably belongs to C. porrecta , but it is not included in the type material.