Gnathochorisis punctata 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: 214-215

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Gnathochorisis punctata Humala

sp. nov.

Gnathochorisis punctata Humala  , sp. nov.

Figs 3View FIGURE 3 B, 4F, 4I, 5F, 6F.

Description. Female. Body 3.4 mm; fore wing 2.7 mm.

Head 1.15 × as wide as high; frons nearly polished with weak microsculpture; face polished, sparsely and finely punctate, at level of antennal fossae 0.45 × as wide as head ( Fig. 4View FIGURE 4 F); inner eye orbits subparallel. Clypeus weakly separated from face, approximately 1.8 × as wide as high, edge of clypeus strongly convex. Mandibles of unusual shape, strongly tapered and sinuous, twisted inwards ( Fig. 4View FIGURE 4 I); maxillary palp long, almost reaching fore coxa. In dorsal view, head concave posteriorly, occipital carina reduced. Temple short, 0.2 × as long as eye length; ocular-ocellar line 1.2 × as long as maximum diameter of lateral ocellus, postocellar line 0.7 × as long as maximum diameter of lateral ocellus ( Fig. 5View FIGURE 5 F). Antenna long, thinned apically, with 19 flagellomeres, basal flagellomere 6.2 × as long as wide, subapical segments about 2.5 × as long as wide.

Mesosoma 1.25 × as long as high. Mesoscutum convex, matt with short adpressed dense setae; epomia present; notauli weakly developed; epicnemial carina complete. Scutellum with lateral carinae up to its apex.

Most of mesopleuron and metapleuron polished. Propodeum polished with sparse setae; area basalis fused with area superomedia, costula not developed, lateral longitudinal carina reduced basally, small propodeal apophyses present ( Fig. 6View FIGURE 6 F). Fore wing with long narrow petiolate areolet, longer than high; 2rs-m shorter than 3rs-m; vein cu-a slightly antefurcal, hind wing with nervellus not or indistinctly intercepted below middle, vein Cu1 indistinct. Hind leg stout, coxa and femur polished, tibia and tarsus coriaceous; hind femur 3.4 × as long as wide; tibia 4.9 × as long as maximum width; basitarsus 0.45 × as long as hind tibia.

First metasomal segment slightly arched, robust, 1.4 × as long as its posterior width, dorsal longitudinal carina well developed; sternite at 0.4, spiracle at 0.55 of tergite length. Postpetiole coriaceous with irregular longitudinal striae laterally. Second tergite 0.74 × as long as its posterior width, coriaceous, with small round thyridium and irregular longitudinal striae in basal 2/3 of tergite, apical 1/3 nearly polished ( Fig. 6View FIGURE 6 F). Remaining tergites of metasoma polished, somewhat compressed laterally from tergite 3. Ovipositor upcurved, approximately as long as first metasomal segment, tip with subapical dorsal notch lacking.

Face, clypeus, malar space, scape ventrally, propleuron, mesopleuron ventrally, all coxae and hind femur ventrally, sternites (more sparsely) with small blackish papillae bearing inconspicuous setae.

Fuscous. Malar space, mandibles, palps, coxae and trochanters mostly pale. Face, clypeus, base of antennae, temples, propleuron, pronotum, tegulae, wing bases, mesopleuron, metapleuron, most of fore and mid legs yellowish. Frons, mesoscutum, most of propodeum, hind coxa dorsoapically, thyridium, tergites 3 and 6 laterally and tergites 4–5 laterobasally reddish-brown. Hind legs mostly yellowish brown, hind coxa darkened apically, hind femur with fuscous bands basally and apically, hind tibia somewhat darkened apically with indistinct subbasal yellowish band. Wings slightly infumate, veins and pterostigma brown.

Male. Similar to female. Antenna with 19 flagellomeres; mesoscutum reddish-brown, scutellum and postscutellum infuscate, propodeum mostly yellowish-brown; tergites of metasoma mostly fuscous.

Comparison. Similar to the Peruvian G. dilleri  sp. nov. in having strongly tapered and sinuous mandibles, but differs in the distinct longitudinal striae on tergite 1 and basal half of tergite 2, short area superomedia, 1.3 × as long as wide, more abundant punctures on ventral surfaces, mostly fuscous dorsal surface of the mesosoma and metasoma, and hind legs with distinct fuscous bands on the hind coxa, femur and tibia.

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 

Paratypes: 1 female and 2 males with same label as holotype, 1 male with same label, but collecting date 12.II – 3.III.2007; 1 male with same label, but 20.I –24.II.2006 (ZISP).

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

Etymology. Named after the distinct punctation of the face, clypeus and all ventral surfaces of the body.


Zoological Institute, Russian Academy of Sciences