Corynoneura ascensa, Fu & Saether, 2012

Fu, Yue & Saether, Ole A., 2012, 3536, Zootaxa 3536, pp. 1-61 : 8-11

Corynoneura ascensa sp. n.

( Figs 3 A–F; Figs 4 A–F)

Corynoneura n. sp. 5 Bolton, 2007: 30.

Type material. Holotype male, with associated larval and pupal exuviae, USA: Ohio, Champaign County, spring at tributary to east branch of Cedar Run south of Woodburn Rd. , 15& 19.iv.1989, M.J. Bolton ( ZMBN Type no. 453) . Allotype USA: Ohio, Summit County, spring in Sand Run Metro Park , 18 & 24.iii.1989, M.J. Bolton ( ZMBN) . Paratypes: 1 female, 1 pupal and 1 larval exuviae, as holotype; 1 male, 1 pupal and 2 larval exuviae, as allotype except for 12.iv.1987, M.J. Bolton ( MJB) .

Etymology. From Latin, ascensus, a flight of stairs, referring to the shape of the inferior volsella.

Diagnostic characters. The adult male is characterized by the antenna with 10 flagellomeres, AR about 0.35; lateral sternapodeme with very large attachment point and placed caudally; inferior volsella broad and of a particular shape. The female has long hind tibia with a serrated spur, lacks setae on gonocoxite IX, has 4 setae on tergite IX, notum very short, ramus long and broadened medially, and 8 fused lateral lamellae on the coxosternapodeme. The pupa has no taeniate L-setae on tergites I and II; tergites III–VI with few small shagreen anteriorly, shagreen getting thick and larger posteriorly, and there is light brown pigmentation across segments II/ III–V/VI in the area of the larger shagreen; and 16 taeniae on the anal lobe that are restricted to the posterior half. The larvae are separable by having head capsule integument smooth, unsculptured; the antenna length is longer than head length (1.1–1.5); mentum with trifid median teeth, and lateral tooth adjacent to median tooth very small. Male (n = 2–3)

Total length 1.33 mm. Wing length 0.82 mm. Total length/wing length 1.63. Wing length/profemur length 3.2. Coloration. Head and thorax yellowish brown. Legs and abdomen pale yellow.

Head. Antenna ( Fig. 3 B) with 10 flagellomeres, with about 15 apical sensilla chaetica, longest antennal seta 328 µm. AR 0.35. Temporals absent. Tentorium 125 µm long, 20 µm wide; stipes 71 µm long, 2 µm wide. Anterior margin of cibarial pump concave. Clypeus with 8 setae. Length of palpomeres (in µm): 14, 19, 21, 25, 62. Palpomere 5/3 ratio: 3.0.

Thorax. Dorsocentrals 4, prealars 2. Scutellum with 2 setae. Anapleural suture 107 µm long.

Wing ( Fig. 3 A). VR 5.5. Cu/wing length 0.62, C 408 µm long, Cu 505 µm long, wing width/ wing length 0.44, costa with 4 setae.

Legs. Fore trochanter with dorsal keel. Spur of fore tibia 23 µm long, spurs of mid tibia 8 µm and 14 µm long, of hind tibia 11µm and 32 µm long. Width at apex of fore tibia 21 µm, of mid tibia 18 µm, of hind tibia (a) 30 µm. Width of hind tibia 1 / 3 from apex (d) 20 µm, elongation length (b) 36 µm, length of maximum thickening (c 1) 57 µm, total length of thickening (c 2) 111 µm, a/d 1.5, b/d 1.8, c 1 /d 2.9, c 2 /d 5.6. Hind tibia expanded, with comb of 17 setae, one seta near spur strongly S-shaped. Lengths and proportions of legs as in Table 2.

Hypopygium ( Fig. 3 C–D). Tergite IX with 4 long setae. Laterosternites IX with 2 long setae. Superior volsella anteriomedially fused, small and rounded. Inferior volsella broad, with many glandular setae and strong marginal setae. Phallapodeme curved, 44 µm long. Transverse sternapodeme 11 µm wide. Large attachment point of lateral sternapodeme with phallapodeme placed caudally and caudally directed. Gonostylus apical curved, 30 µm long; megaseta 5 µm long. HR 2.5, HV 4.4.

Female (n = 1)

Total length 1.01 mm. Wing length 0.82 mm. Wing width/wing length 0.46. Total length/wing length 1.24. Wing length/profemur length 3.6.

Coloration. Head yellowish brown with dark brown eyes. Thorax with yellowish ground color with dorsal part of antepronotum, scutum, ventral part of preepisternum. scutellum, and postnotum light brown. Legs almost hyaline. Abdomen light brown.

Head. Eyes bare. Height of eye/height of head 0.63. AR 0.32. Length of flagellomeres (in µm): 44, 33, 33, 32, 44. Ultimate flagellomere with 10 apical sensilla chaetica, without basal setae. Tentorium 81 µm long, 10 µm wide; stipes 69 µm long, 3 µm wide. Clypeus with 6 setae. Palpomere lengths (in µm): 14, 15, 15, 28, 48. Palpomere 5/3 ratio 3.2; palpomeres 1–3 elliptical, no sensilla clavata.

Thorax. Dorsocentrals 7, uniserial; prealars 2; supraalar 1. Scutellum with 2 setae.

Wing ( Fig. 4 A). Wing broad. VR 3.5; one anal vein present, Cu 495 µm long, Cu/wing length 0.61; C 359 µm long; C/wing length 0.44. Costa with 12 setae.

Legs. Fore trochanter with keel. Spur of fore tibia 12 µm long, spur of mid tibia 12 µm long, and hind tibia with three spurs: a long and serrated spur, 46 µm long; a lateral spur 21 µm long, and a short strong spur, 8 µm long. Width at apex of fore tibia 19 µm wide, of mid tibia 21 µm, of hind tibia (a) 26 µm. Width of hind tibia 1 / 3 from apex (d) 16 µm, elongation length (b) 32 µm, length of maximum thickening (c 1) 61 µm, total length of thickening (c 2) 121 µm, a/d 1.6, b/d 2.0, c 1 /d 3.8, c 2 /d 7.5. Hind tibial ( Fig. 4 B) comb with 5 setae, one seta near short strong spur S-shaped. Lengths and proportions of legs as in Table 3.

Abdomen. Abdomen broad. Number of setae on tergites IV–VIII as: 2, 2, 2, 2, 2. No setae on sternites.

Genitalia ( Figs 3 E–F). Tergite IX with 4 long caudal setae. Cercus 30 µm long, 22 µm wide. Notum length 30 µm, ramus long and broadened medially. Gonocoxite without long setae. Coxosternapodeme with 8 lateral lamellae. Seminal capsule 67 µm long, neck 10 µm long, 4 µm wide.

Pupa (n = 1–2)

Total length 1.80 mm. Exuviae yellowish with light brown cephalothorax.

Cephalothorax. Frontal setae 21 µm long. Median antepronotals 14–21 and 10 µm long. Lateral antepronotals 16 µm long. Thoracic horn length 18 µm, width 4 µm. Anterior precorneal seta (PcS 1) 11–14 µm long, PcS 2 14 µm long, PcS 3 11 µm long. PcS 1–3 almost in a line, PcS 1 6–10 µm from PcS 2, PcS 2 4 µm from PcS 3, PcS 1 8–12 µm from PcS 3, PcS 3 40–60 µm from thoracic horn. Anterior dorsocentral (Dc 1) 14 µm long, Dc 2 11µm long, Dc 3 11µm long, Dc 4 14 µm long. Dc l located 6 µm from Dc 2, Dc 2 located 11 µm from Dc 3, Dc 3 located 8 µm from Dc 4. Wing sheath with one row of pearls.

Abdomen ( Fig. 4 C). Shagreen and chaetotaxy as illustrated. No taeniate L-setae on tergite I; O-setae present in all segments. Anal lobe 125 µm long. Anal lobe fringe with 16 setae, 117 µm long, restricted to posterior half. Anal macrosetae 110 µm long, median setae 61 µm long.

Larva (n = 1–2)

Coloration. Head light brown; head capsule integument smooth, unsculptured. Antenna with basal segment almost transparent, other segments light brown. Abdomen yellowish.

Head. Capsule length 240–248 µm, width 176µm. Postmentum 212–220 µm long. SII large, rising from small tubercle, SI and SIII not observed. Premandible 28–30 µm long, brush of premandible not observed. Mentum as Fig. 4 F. Mandibles 43–48µm long. Antenna ( Fig. 4 D), AR 1.1–1.5. Length of flagellomeres I–IV (in µm): 131– 133, 65–69, 71–73, 8. Basal segment 18–19 µm wide, length of blade at apex of basal segment 35–41 µm, ring organ at 73–76 µm from base of antenna.

Abdomen. Length of anal setae 131–152 µm. Procercus 8–10 µm long, 7–8 µm wide. Subbasal seta of posterior parapods split as Fig. 4 E.