Gonatocerus (Gastrogonatocerus) nigriceps
Creators: name: Triapitsyn, Serguei V.
name: Huber, John T.
name: Logarzo, Guillermo A.
name: Berezovskiy, Vladimir V.
name: Aquino, Daniel A.
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Mymaridae
Gonatocerus
Gonatocerus nigriceps

description: Gonatocerus (Gastrogonatocerus) nigriceps (Ogloblin, 1955)
(Figs 133–135)
Lymaenon (Gastrogonatocerus) nigriceps Ogloblin 1955: 18 (illustrations), 19–20. Type locality: Piquete, Bella Vista, Jujuy, Argentina.
Gonatocerus (Gastrogonatocerus) nigriceps (Ogloblin): De Santis 1967: 106 (catalog).
Gonatocerus nigriceps (Ogloblin): Yoshimoto 1990: 40 (listed in membraciphagus species group); Luft Albarracin et al. 2009: 10 (list; distribution in Argentina).
Lymaenon nigriceps Ogloblin: Loiácono et al. 2005: 17 (type information, incorrectly listed as presumed lost).
Type material examined. Holotype female [MLPA] on slide labeled: “ Gastrogonatocerus nigriceps A. Ogl ♀ Piquete – Bella Vista Pcia Jujuy 3–4.V.1951. A. O.”. The holotype is in very bad condition, fragmented, with at least pedicel and F1–F4 of one of the antennae, one hind wing, and some leg segments missing; the body is uncleared, mounted more or less laterally (Fig. 134).
Redescription. FEMALE. Head and flagellum dark brown; scape and pedicel brown, mesosoma and petiole brown, basal gastral terga yellowish or light brown, remainder of gaster brown to dark brown; legs brown.
Antenna (Fig. 133) with radicle about 3.5x as long as wide, 0.3x total length of scape, rest of scape 3.9x as long as wide, with faint sculpture; pedicel longer than F1; F1 subglobular, the shortest funicle segment and without mps; F2–F8 subequal (F3 a little longer and F8 a little shorter) and each with 2 mps; clava 3.6x as long as wide, with 8 mps, a little shorter than combined length of F6–F8.
Forewing (Fig. 135) 3.2x as long as wide; longest marginal seta about 0.2x maximum wing width; forewing disc bare except for 2 setae just behind stigmal vein and almost hyaline behind and just beyond (anteriorly only) venation, setose and slightly infumate elsewhere. Hind wing (partially obscured by the head) setose and infumate apically.
Gaster longer than mesosoma; ovipositor long, 2.3x length of metatibia [it is not possible to measure the mesotibia], projecting strongly forward under mesosoma as far as procoxa, exserted a little beyond apex of gaster (by about 0.04x own length).
Measurements (µm) of the holotype. Mesosoma 505; gaster 628; ovipositor 1082. Antenna: radicle 91; rest of scape 212; pedicel 73; F1 27; F2 88; F3 97; F4 88; F5 91; F6 88; F7 88; F8 82; clava 240. Forewing 1402:437; longest marginal seta 91.
MALE. Unknown.
Diagnosis. Gonatocerus (Gastrogonatocerus) nigriceps, known from the holotype only, is characterized by the following unique combination: female antenna (Fig. 133) with F1 very short, subglobular, and F2–F8 subequal in length and each with 2 mps; forewing disc mostly bare behind venation, slightly infumate beyond stigmal vein (Fig. 135); and ovipositor projecting strongly forward under mesosoma as far as procoxa and slightly exserted beyond apex of gaster (Fig. 134).
Distribution. NEOTROPICAL: Argentina.
Hosts. Unknown.
description: Published as part of Triapitsyn, Serguei V., Huber, John T., Logarzo, Guillermo A., Berezovskiy, Vladimir V. & Aquino, Daniel A., 2010, Review of Gonatocerus (Hymenoptera: Mymaridae) in the Neotropical region, with description of eleven new species, pp. 1-243 in Zootaxa 2456 on pages 72-73, DOI: 10.5281/zenodo.894928