Corynoptera fratercula, Vilkamaa, Pekka & Hippa, Heikki, 2006

Vilkamaa, Pekka & Hippa, Heikki, 2006, Corynoptera vagula Tuomikoski and allied species (Diptera: Sciaridae), Zootaxa 1150, pp. 31-42 : 37-38

Corynoptera fratercula sp. n.

Material examined. Holotype male: USA, Alaska, mi S Anderson Jct, Rte 3, mi 270, alderpoplar­spruce, Malaise trap, 23.vi.–11.viii.1984, S. & J. Peck ( MZH). Paratypes: same data as holotype, 1 ɗ ( MZH), CANADA, British Columbia, Vancouver Island, Upper Carmanah Valley, forest floor, Malaise trap. 30.vii.1991, N. Winchester, 2 ɗ ( CNC, RBCM), same data but Malaise trap, 31.vii.–11.viii.1991, 2 ɗ ( MZH).

Description (male). Head ( Fig. 4 ): Eye bridge 2 or 3 facets wide. Prefrons with 17–24 setae, clypeus with 1–3 setae. Length/width of antennal flagellomere 4 1.90–2.25 ( Fig. 5 C). Palpomere 1 of maxillary palp with 1 or 2 setae ( Fig. 4 D and E). Thorax: Anterior pronotum with 3–5 setae, episternum 1 with 5–9 setae. Wing: Length 1.4–1.6 mm, width/ length 0.40–0.45, c/ w 0.50 –0.60, R1/R 0.60–0.80. Legs ( Fig. 6 D): Length of front basitarsomere/length of front tibia 0.50–0.60. Abdomen: Sternite 8 with 2–8 setae. Hypopygium ( Fig. 3 C–D): Sternite 10 with 1 seta on each half.

Female. Unknown.

Discussion. Corynoptera fratercula resembles C. vagula and differs from other species in having a pair of mesial megasetae distinctly separated from the subapical group of megasetae on the gonostylus. Corynoptera fratercula differs from C. vagula in having the tegmen shorter than long, apically more roundish but with more strongly curved parameres and with longer parameral apodemes ( Figs. 1 A, C; 3C, E). Furthermore, in C. fratercula the megasetae of the gonostylus are slightly weaker and the pair of mesial megasetae is more basal in position on the gonostylus ( Figs. 1 B, D; 3D). Corynoptera fratercula differs from all other species discussed here by having the intercoxal area of the hypopygium longer and by having the bases of the gonocoxites ventrally more densely setose ( Fig. 3 E).

Figures

FIGURE 1. Corynoptera vagula Tuomikoski (A and B holotype, C and D from Kuujjuarapik). A, part of hypopygium. B, D, gonostylus. C, tegmen and associated structures, ventral view. Scale 0.10 mm.

FIGURE 3. Part of hypopygium (A and E), gonostylus (B and D), and tegmen (C), ventral view. A, B, Corynoptera armigera sp. n. (holotype). C – E, C. fratercula sp. n. (C paratype from Alaska, D and E holotype). Scale 0.10 mm.

FIGURE 4. Wing (A), dorsal view; thoracic dorsum (B), lateral view; and maxillary palp (C – E), dorsal view. A, Corynoptera robustior sp. n. (holotype). B – E, C. fratercula sp. n. (B and E holotype, D paratype from Alaska). C, C. vagula Tuomikoski (from Kuujjuarapik). Scale for A 0.50 mm, for B 0.20 mm, for C – E 0.05 mm.

FIGURE 5. Antennal flagellomere 4, ventral view. A, Corynoptera fera Mohrig & Heller (from Somero). B, C. vagula Tuomikoski (from Kuujjuarapik). C, C. fratercula sp. n. (holotype). D, C. robustior sp. n. (holotype). E, C. armigera sp. n. (holotype). Scale 0.05 mm.

FIGURE 6. Apex of front tibia, prolateral view. A, Corynoptera armigera sp. n. (holotype). B, C. Corynoptera fera Mohrig & Heller (from Somero). C, C. vagula Tuomikoski (holotype). D, C. fratercula sp. n. (holotype). E, C. robustior sp. n. (holotype). Scale 0.05 mm.