Gnathochorisis rufa Humala

Humala, Andrei E., 2017, New species of the genus Gnathochorisis Förster (Hymenoptera: Ichneumonidae: Orthocentrinae) from the Neotropical Region, Zootaxa 4250 (3), pp. 201-218: 215

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Gnathochorisis rufa Humala

sp. nov.

Gnathochorisis rufa Humala  , sp. nov.

Figs 3View FIGURE 3 D, 4H, 5H, 7B.

Description. Female (holotype). Body length 4.3 mm. Fore wing length 3.1 mm.

Head 1.2 × as wide as high; frons polished, face polished sparsely and finely punctate, at level of antennal fossae 0.4 × as wide as head ( Fig. 4View FIGURE 4 H). Inner eye orbits subparallel. Clypeus separated from face, about 1.6 × as wide as high, edge of clypeus convex; malar space 0.85 × as long as mandible basal width, with subocular sulcus; maxillary palp long, reaching middle coxa. Mandibles turned inwards, lower tooth shorter than upper. In dorsal view, head concave posteriorly, occipital carina complete; temples distinct, but short, 0.15 × as long as eye length, ocular-ocellar line 1.1 × as long as maximum diameter of the lateral ocellus, postocellar line 0.7 × as long as maximum diameter of the lateral ocellus ( Fig. 5View FIGURE 5 H).

Antenna slightly longer than fore wing, not thinned apically, with 20 flagellomeres, basal flagellomere 6.0 × as long as wide, subapical flagellomeres nearly 1.5 × as long as wide.

Mesosoma 1.3 × as long as high. Mesoscutum matt with short adpressed dense setae; notauli weakly developed anteriorly; epomia present; epicnemial carina complete; scutellum in profile high, without lateral carinae. Propodeum polished, all carinae strongly raised, area superomedia slightly elongate, costula present; propodeal apophyses resulting from crossing lateral longitudinal and posterior transverse carinae developed ( Fig. 7View FIGURE 7 B); spiracle connected with lateral longitudinal carina by short carina; metapleuron polished.

Areolet in fore wing small, clearly petiolate, longer than high; vein cu-a inclivous, opposite Rs+M; hind wing with inclivous nervellus clearly intercepted at lower 1/3, Cu1 present. Hind leg stout, coxa and femur polished, tibia and tarsus coriaceous, hind femur inflated, 3.3 × as long as high. Hind tibia somewhat inflated, 4.6 × as long as its maximal width subapically; basitarsus 0.3 × as long as hind tibia.

First metasomal segment arched, 2.5 × as long as posteriorly broad, polished, dorsal and lateral longitudinal carinae developed. Protruding spiracles at 0.45, sternite at 0.55 of first tergite length. Second tergite slightly coriaceous, 1.05 × as long as posteriorly broad, with small thyridium basally ( Fig. 7View FIGURE 7 B). Remainder of metasoma polished, somewhat compressed laterally from third tergite. Ovipositor slightly upcurved, about as long as first metasomal segment, tip without subapical dorsal notch.

Rufous. Clypeus, mandibles, palps, tegulae, fore and middle coxae and trochanters pale yellow. Antennal flagellomeres in apical third of flagellum, interocellar area and occiput fuscous. Legs mostly rufous, hind tibia somewhat infuscate basally and apically. First metasomal segment fuscous, second tergite fuscous in basal 2/3, third tergite rufous, remaining tergites mostly brown, yellowish rufous laterally. Wings slightly infumate, veins and pterostigma brown.

Male. Unknown.

Comparison. Differs from other Neotropical species of the genus by the entirely rufous mesosoma, and well developed costulae and apophyses on the propodeum. It is similar to G. khalaimi  sp. nov. in having apophyses on the propodeum, but differs by the narrower face and hind femur not inflated.

Material examined. Holotype female ( ZISP), French Guiana, Kaw mountains, 40 km SSE Cayenne, 4°33.562' N, 52°12.425' W, Malaise trap 3–27.III.2007, leg. K. Sarv.GoogleMaps 

Distribution. French Guiana ( Fig. 1View FIGURE 1).

Etymology. Named after the dominant red color of the body.


Zoological Institute, Russian Academy of Sciences