Corynoneurella afra (Lehmann) Lehmann, 2010

Fu, Yue, Hestenes, Tor Christian & Saether, Ole, 2010, Review of Afrotropical Thienemanniella Kieffer (Diptera: Chironomidae: Orthocladiinae), Zootaxa 2338, pp. 1-22 : 2-3

Corynoneurella afra (Lehmann) comb. n.

Thienemanniella afra Lehmann, 1981: 22 , Harrison 1992: 193 [Key].

Material examined. DEMOCRATIC REPUBLIC OF THE CONGO: Kisangani, Sisimi-Bach, 13, J. Lehmann, 1975 ( ZSM). Kisangani, Kies Yevll Sajd, 1 3, 11. iv. 1975, J. Lehmann, ( ZSM).

Diagnostic characters. The adult male has an antenna with flagellomeres 1–8 subrectangular in shape, while segments 9–11 are smaller and rounded. Antenna with 12 flagellomeres, apex rounded, AR about 0.25. Eyes bare, head with two postorbitals. Superior volsella not fused, inferior volsella small, caudally situated and well separated from superior volsella. Hind tibia with simple spur and smaller seta. Tergite I with 1 setae to each side. The pupa is 1.27 mm long; wing sheath without pearls; no taeniate L-setae on tergite I–III, tergites III–VI with very thick shagreen anteriorly and getting fewer posteriorly.

Male imago, as in Lehmann (1981) with the following additions (n = 1–2).

Total length 1.28–1.30 mm. Wing length 0.54 mm. Total length/wing length 2.42. Wing length/profemur length 2.70. Wing width/wing length 0.48. Abdomen ( Lehmann 1981 fig. 28) with tergites II–IV pale.

Head. Eyes bare. AR 0.25–0.26. Antenna with flagellomeres 2–8 of about same size and form, 20–25 µm long; flagellomeres 9–11 small and rounded, 11–15 µm long. Ultimate flagellomere not broadened, with about 30 sensilla chaetica, 4–5 of basal sensilla chaetica unusually broad, apex rounded. Tentorium 106 µm long, with two basal extensions, one directed medially and one basally. Palpomere lengths (in µm): 15, 15–22, 24– 26, 36, 66–69. Palpomeres 5/3 2.6–2.9. Palpomere 2 and 3 elliptical, 4 slight broader and rectangular, 5 slender ( Lehmann 1981 fig. 29). Sensilla clavata apparently lacking.

Wing ( Lehmann 1981 fig. 26). Anal lobe poorly developed. VR 1.86. An1/wing length 0.40. Pc/wing length 0.61. C/wing length 0.29, Cu/wing length 0.53. Costa with 7–9 uniserial marginal setae, posterior wing margin with alternating long and short setae, anterior margin with short strong setae.

Legs. Fore trochanter with distinct dorsal keel. Spur of fore tibia 20–23 µm long, spurs of mid tibia 9 µm and 16 µm long, of hind tibia 20–21 µm and 14–16 µm long. Width at apex of fore tibia 15 µm, of mid tibia 18 µm, and of hind tibia (a) 26 µm. Width of hind tibia 1/3 from apex (d) 16 µm, elongation (b) 15 µm long, maximum thickening (c1) 26 µm long, total length of thickening (c2) 50 µm, a/d 1.63, b/d 0.94, c1/d 1.63, c2/d 3.10. Tarsomere 4 of legs subrectangular. Hind tibia with comb of 14 setae. Sensilla chaetica apparently lacking. Length of leg segments and their proportions as in Table 1.

TABLE 1. Lengths (in µm) and proportions of legs segments of male Corynoneurella afra (Lehmann) comb. n. fe ti ta1 ta2 ta3 ta4

p1 168–199 206–226 131–146 47–51 29–33 26

p2 208–219 208–337 110–117 47–69 29 15–22

p3 164–180 193–208 117 66–69 26–29 15–21 ta5 LR BV SV BR

p1 29 0.65 2.83–2.95 3.63 1.4

p 2 29–31 0.49–0.53 3.65–4.24 3.80–3.91 1.0–1.2

p3 26 0.61–0.71 3.01–3.20 3.06–3.41 1.0–1.5 Hypopygium ( Lehmann 1981 fig. 27). Tergite IX with numerous small setae. Superior volsella narrow, separate plates. Inferior volsella small, placed caudally, with thin glandular setae. Phallapodeme bent, with basal projections directed both orally and caudally. Transverse sternapodeme thick, 27 µm long. Gonocoxite 73µm long. Gonostylus 22–23 µm long. HR 3.20–3.37, HV 5.71–5.94.

Pupa. Total length 1.27 mm. Exuviae pale, transparent with yellowish thorax.

Cephalothorax. Frontal setae 14 µm long. Median antepronotals 21µm and 14 µm long. Lateral antepronotals 11 µm long. PcS1 11 µm long, PcS2 10 µm long. PcS1–3 not in a line; PcS1 4 µm from PcS2; PcS2 6 µm from PcS3; PcS1 7 µm from PcS3. Dorsocentrals Dc1 14 µm long. Dc l located 10 µm from Dc2, Dc2 located 25 µm from Dc3, Dc3 located 10 µm from Dc4. Wing sheath without pearls.

Abdomen. Shagreen and chaetotaxy as illustrated in Lehmann (1981 fig. 35). Taeniate L-setae on tergites I–III absent; O-setae absent in all segments. Anal lobe 105 µm long. Anal lobe fringe with more than 10 shorter setae which almost transparent. Three anal macrosetae, all 131 µm long; median seta 104 µm long.

Distribution. The species is known only from Kisangani Province, Democratic Republic of the Congo ( Lehmann 1981).

Remarks. Lehmann’s (1981) description and drawings are accurate except that the anal macrosetae of the pupae are not taeniate, but apparently cylindrical at base and narrowly taeniate closer to apex.