Erythmelus (Erythmelus) yuzhanin Triapitsyn

Triapitsyn, Serguei V., 2008, New records of Erythmelus (Hymenoptera: Mymaridae) from the Neotropical region, with description of a new species from Argentina, Zootaxa 1842, pp. 66-68 : 67-68

Erythmelus (Erythmelus) yuzhanin Triapitsyn , sp. n.

( Figs 1–3 )

Type material. Holotype female on slide [ MLPA], labeled: “ Erythmelus Ψ Bialet-Massé [sic] XII.1940 Prov. Córdoba. A. O.”. Paratypes: 1 female on slide [ MLPA], labeled: “ Erythmelus ? clavatus [in pencil] Ψ Biolet-Massé [sic] Prov. Córdoba. 2.XII.1940. A. O.”; 1 female on slide [ MLPA], labeled: “ Erythmelus ? clavatus [in pencil] Ψ Biolet-Masse. [sic] Cor. 3–xii–40.? huevos de Mirid. A. O.”; 1 female on slide [ MLPA], labeled: “ Erythmelus Ψ [drawing of gaster in pencil] Bielet. Masset [sic] Pr. Cordoba. 15.xi.1940.”. The species is so far only known from its type locality (Bialet Massé, Córdoba Province, Argentina). The collector is A.A. Ogloblin. The holotype specimen is only partially cleared but otherwise is in good condition, mounted dorsoventrally.

Description. FEMALE (holotype and paratypes). Body length 984–1224 µm. Body mostly dark brown except base of gaster light brown, hypopygium brown, and borders of axilla and scutellum a little lighter; midlobe of mesoscutum with a light brown, transverse submedian stripe. Antenna brown (pedicel a little lighter than other antennomeres). Procoxa, mesocoxa, base of metacoxa, femora, most of mesotibia, and about distal half of metatibia brown; metacoxa distally, trochanters, protibia, base of mesotibia, about basal half of metatibia, and tarsi yellow to light brown. Vertex transversely striate, with a few short setae.

Antenna ( Fig. 1 ) with scape 4.4–4.8 x as long as wide, a little dilated in the middle; pedicel much longer than F1; all funicle segments longer than wide; F1 the shortest funicle segment, F3 much longer than F2, longer than F4, and shorter than F5; F5 about as long as F6; F1, F2 and F4 without longitudinal sensilla, F3 with 1 longitudinal sensillum, F5 and F6 each with 2 longitudinal sensilla; clava 3.6–4.1 x as long as wide, with 6 longitudinal sensilla.

Mesosoma ( Fig. 2 ). Mesoscutum wider than long, its midlobe finely longitudinally striate and with 1 pair of strong setae. Axillar seta about as long as 1/3 length of scutellum. Scutellum a little shorter than mesoscutum, posterior scutellum finely longitudinally striate. Dorsellum broadly angulate posteriorly.

Wings ( Fig. 3 ). Forewing about 4.6 x as long as wide; disc slightly infumate behind submarginal vein and at apex, otherwise hyaline, with unevenly distributed setae only in the distal 3/10; the longest marginal seta 1.1–1.2 x greatest width of wing. Hind wing 17–18 x as long as wide, about as long as forewing; disc infumate, particularly distally; the longest marginal seta about 3.6 x greatest width of wing.

Metasoma ( Fig. 2 ). Petiole much wider than long. Gaster longer than mesosoma; ovipositor with a large basal loop, at least 4/5 length of gaster, markedly exserted beyond apex of hypopygium and also beyond apical gastral tergum (by 1/ 5 to 2/5 of ovipositor length, depending on the size and configuration of its basal loop: the shorter the latter is, the more the ovipositor is exserted), and 2.1–2.2 x length of metatibia.

Measurements of the holotype (in µm). Body: 1224; mesosoma 442; gaster 572; ovipositor 670. Antenna: scape (including radicle) 176; pedicel 60; F1 30; F2 44; F3 61; F4 54; F5 79; F6 82; clava 171. Forewing 803:173; longest marginal seta 203. Hind wing 806:46; longest marginal seta 167.

MALE. Unknown.

Etymology. The specific name (a noun in apposition) stands for “southerner” in Russian.

Diagnosis. Member of the clavatus species group of the nominate subgenus of Erythmelus , as defined by Triapitsyn et al. (2007). In Triapitsyn et al. (2007), E. (E.) yuzhanin would key to the same couplet as E. (E.) logarzoi Triapitsyn (from Argentina) and E. (E.) podaypodnos Triapitsyn (from Bolivia). Erythmelus (E.) yuzhanin differs from both these species by its female antenna, which lacks longitudinal sensilla on F4, as indicated in the key below.

Hosts. Unknown, although on one of the paratype slides A.A. Ogloblin indicated “? huevos de Mirid.“ [?eggs of Miridae ].

Figures

FIGURES 1 – 3. Erythmelus (Erythmelus) yuzhanin (female, holotype). 1. Antenna. 2. Body. 3. Forewing and hind wing.