Arescon stenopterus Jin & Li

Jin, Xiang-Xiang, Li, Cheng-De & Yang, Jian-Chun, 2016, Description of three new species of Arescon Walker (Hymenoptera, Mymaridae) from China, ZooKeys 584, pp. 83-94 : 86-88

Taxon classification Animalia Hymenoptera Mymaridae

Arescon stenopterus Jin & Li sp. n. Figs 7-11, 12-16

Holotype.

♀ (NEFU) Xizang Autonomous Region (= Tibet), Mt. Sejila, 30.VII. 2013-01.VIII. 2013, Hui-Lin Han, Zhi-Guang Wu, YPT.

Paratypes.

6 females, 1 male. Xizang Autonomous Region (= Tibet): same data as holotype (1♀, NEFU); Linzhi City, 28.VII. 2012-04.VIII. 2012, Zhao-Hui Pan, MT (2 ♀♀, NEFU); Mt. Sejila, 27. VII. 2013, Hui-Lin Han, Zhi-Guang Wu, YPT (1♀, NEFU); Mt. Sejila, 4100 m, 22. VIII. 2014-23. VIII. 2014, Hui-Lin Han, YPT (2 ♀♀ 1♂, NEFU).

Diagnosis.

Antenna (Fig. 7) of female with fl2 distinctly longer than each of fl3-fl5; clava 2.2 –2.6× as long as wide, slightly shorter than scape; metanotum (Fig. 8) with dorsellum triangular; propodeum longer than scutellum; phragma broad with posterior margin nearly straight; fore wing (Fig. 9) 5.05 –5.35× as long as wide, with venation extending just about half wing length; fore wing base behind submarginal vein with 2 or 3 rows of setae, with a small oval bare area behind the basal part of submarginal vein along posterior margin, and disc at the broadest part of wing with about 12 or 13 irregular rows of setae; ovipositor (Fig. 11) 1.03 –1.19× as long as metatibia, distinctly exserted.

Description.

Female (holotype data in square brackets). Body length 730-980 [780]. Head brown with eye, ocelli, transverse trabecula and part of supraorbital trabecula dark brown. Antenna brown with radicle, scape and pedicel paler. Mesosoma brown with frenum pale yellowish brown. Wings infuscate with base of fore wing brown and largely infuscate behind marginal vein. Legs brown with trochanters and apical parts of femora paler. Metasoma brown with petiole pale yellowish brown and base of gaster and tip of ovipositor pale brown.

Head. Vertex weakly sculptured, ocelli on an almost rectangular stemmaticum; face with faint sculpture.

Antenna. Antenna (Fig. 7) sparsely setose. Radicle 0.31-0.35 [0.35] × as long as scape; scape with faint longitudinal striations, 4.2-4.9 [4.3] × as long as wide; pedicel with faint longitudinal striations, slightly shorter than fl1; all funicular segments much longer than wide, fl1-fl3 without mps; fl1 distinctly shortest, fl2 distinctly longest, more than twice length of fl1; fl3-fl5 slightly shorter and wider distad; fl4 with 1 mps; fl5 with 2 mps; clava 2.2-2.6 [2.6] × as long as wide, slightly shorter than scape, shorter than fl4 and fl5 combined, with 6 mps. Measurements (length/width): radicle 36-48 [38], scape 108 –144/20– 31 [113/26], pedicel 48 –60/34– 60 [50/38], fl1 46 –58/14– 19 [46/17], fl2 91 –144/14– 17 [110/14], fl3 60 –77/17– 22 [70/19], fl4 60 –82/20– 24 [67/26], fl5 58 –72/22– 26 [65/26], clava 103 –118/43– 53 [110/43].

Mesosoma. Mesosoma (Fig. 8) with faint reticulate sculpture. Scutellum distinctly shorter than mesoscutum (57: 84); anterior scutellum subrectangular, with campaniform sensilla a little nearer to lateral margins than to each other. Metanotum with dorsellum distinctly triangular. Propodeum smooth, longer than scutellum medially. Phragma broad, with posterior margin nearly straight.

Wings. Fore wing (Fig. 9) length 950-1232 [1000], width 168-244 [188], length/width 5.05-5.35 [5.30], with venation extending about 0.46 × length of wing; longest marginal setae 242-300 [242], 1.05-1.34 [1.29] × as long as greatest wing width. Fore wing base behind submarginal vein with 2 or 3 rows of setae, with a small oval bare area behind basal part of submarginal vein along posterior margin; disc at broadest part of wing with 12 or 13 irregular rows of setae. Hind wing (Fig. 10) length 718-990 [750], width 26-43 [33], length/width 23-26 [23], longest marginal setae 182-212 [200], about 6-7 [6] × as long as greatest wing width.

Metasoma. Metasoma (Fig. 11) distinctly longer than mesosoma. Petiole short, trapezoidal. Ovipositor length 300-410[320], distinctly exserted, 1.03-1.19 [1.16] × as long as metatibia (260-400 [275]).

Male. Head (Fig. 12) width 211. Antenna as in Fig. 13. Measurements (length): scape 115, pedicel 55, fl1 74, fl2 103, fl3 96, fl4 91, fl5 98, fl6 101, fl7 98, fl8 98. Fore wing (Fig. 14) length 1175, width 210, length/width 5.6, longest marginal setae 260, 1.24 × as long as greatest wing width. Hind wing (Fig. 15) length 900, width 36, length/width 25, longest marginal setae 216, 6 × as long as greatest wing width. Genitalia (Fig. 16) length 154.

Host.

Unknown.

Etymology.

From Greek, stenos meaning narrow and pteron meaning wing. The specific name refers to the relatively narrow fore wing.

Comments.

Arescon stenopterus sp. n., is similar to Arescon dimidiatus (Curtis) in that the fore wing has the venation extending just about half of the wing length and the dorsellum is distinctly triangular, but it can be distinguished from Arescon dimidiatus by the relatively longer fl3, much longer than fl1 (about as long as or slightly longer than fl1 in Arescon dimidiatus ); relatively shorter clava, distinctly shorter than fl4 and fl5 combined (slightly longer than fl4 and fl5 combined in Arescon dimidiatus ); and the dimensions of fore wing length and width, 5.05 –5.35× as long as wide (6.5 × as long as wide in Arescon dimidiatus ).