Erythmelus (Erythmelus) gak S. Triapitsyn, 2007

Triapitsyn, Serguei V., Berezovskiy, Vladimir V., Hoddle, Mark S. & Morse, Joseph G., 2007, A review of the Nearctic species of Erythmelus (Hymenoptera: Mymaridae), with a key and new additions to the New World fauna, Zootaxa 1641 (1), pp. 1-64 : 45-46

Erythmelus (Erythmelus) gak S. Triapitsyn , sp. n.

( Figs 63, 64 )

Type material. Holotype female on slide [ UCRC]: CHILE. REGIÓN IX, Parque Nacional Nahuelbuta , 37°49’30’’S 72°58’24’’W, 1168 m, 10–24.ii.2005, UCR AToL C05–001 . Paratypes: CHILE. REGIÓN IX, Parque Nacional Nahuelbuta , 37°49’30’’S 72°58’24’’W, 1168 m, 10–24.ii.2005, UCR AToL C05–001 [1 female on point, CNCI; 1 female on slide and 7 females on points, UCRC] .

Description. FEMALE (holotype and paratypes). Body length (of the dry specimens) 600–890 µm. Body mostly brown to dark brown except borders of axilla and scutellum, dorsellum, and base of gaster light brown; midlobe of mesoscutum with a lighter (yellow to light brown) transverse submedian stripe. Appendages light brown to brown.

Vertex transversely striate, with a few short setae.

Antenna ( Fig. 63 ) with short setae. Scape 6.0–6.4 x as long as wide; pedicel much longer than F1; all funicular segments more than 2 x as long as wide; F1 the shortest funicular segment, F2 slightly longer than F1 and a little shorter than F3, F3–F5 subequal in length and each much shorter than F6; F1–F5 without longitudinal sensilla, F6 with 2 longitudinal sensilla; clava 4.0–4.3 x as long as wide, with 5 longitudinal sensilla.

Mesosoma. Each lobe of pronotum with several strong setae. Mesoscutum wider than long, its midlobe finely longitudinally striate and with 1 pair of strong setae. Axillar seta extending to 3/10 length of scutellum. Scutellum about as long as mesoscutum, posterior scutellum finely longitudinally striate. Dorsellum broadly angulate posteriorly.

Wings. Forewing ( Fig. 64 ) 4.5–4.8 x as long as wide; blade slightly infumate behind venation but otherwise more or less hyaline, with setae mostly in the distal 2/5; longest marginal cilia 1.4–1.5 x greatest width of wing. Hind wing 19–20 x as long as wide, almost as long as forewing; blade slightly infumate distally; longest marginal cilia 4.4–4.8 x greatest wing width.

Metasoma. Petiole wider than long. Gaster longer than mesosoma; ovipositor 7/10–3/4 length of gaster, barely exserted beyond apical gastral tergum and not exserted beyond apex of hypopygium, about 1.4 x length of metatibia.

Measurements of holotype (in µm). Mesosoma 363; gaster 450; ovipositor 319. Antenna: scape (including radicle) 160; pedicel 55; F1 35; F2 37; F3 43; F4 43; F5 43; F6 76; clava 148. Forewing 682:150; longest marginal cilia 212. Hind wing 652:33; longest marginal cilia 145.

MALE. Unknown.

Etymology. The specific name (a noun in apposition) is an arbitrary combination of letters.

Diagnosis. Member of the flavovarius species group. Among the species of the nominate subgenus that have long funicular segments of the female antenna and lack longitudinal sensilla on F4, E. (E.) gak is characterized by a short ovipositor (ovipositor length: metatibia length ratio 1.4:1), which is barely exserted beyond the apical gastral tergum and not exserted beyond apex of the hypopygium. The forewing is 4.5–4.8 x as long as wide, and the longest marginal cilia are 1.4–1.5 x greatest forewing width. Erythmelus (E.) gak is most similar to E. (E.) fidalgoi sp. n. from Argentina, which has a relatively narrower forewing (5.3–5.8 x as long as wide, longest marginal cilia 1.6–2.0 x greatest forewing width), whose blade is significantly less setose in the distal 2/5 ( Fig. 66 ).

Hosts. Unknown.

Figures

FIGURES 63, 64. Erythmelus (E.) gak (female, holotype). 63. Antenna. 64. Forewing. Scale bars = 0.1 mm.

FIGURES 65, 66. Erythmelus (E.) fidalgoi (female, holotype). 65. Antenna. 66. Forewing. Scale bars = 0.1 mm.