Gnathochorisis rufithorax 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: 215-216

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Gnathochorisis rufithorax Humala

sp. nov.

Gnathochorisis rufithorax Humala  , sp. nov.

Figs 3View FIGURE 3 C, 4G, 5G, 7A.

Description. Female. (holotype). Body 3.8 mm; fore wing length 3.0 mm.

Head. 1.2 × as wide as high; frons matt; face coriaceous, at level of antennal fossae 0.45 × as wide as head ( Fig. 4View FIGURE 4 G); inner eye orbits subparallel; vertex somewhat depressed. Clypeus well separated from face, approximately 1.8 × as wide as high, clypeus convex apically; malar space 1.2 × as long as mandibular base; maxillary palp very long, reaching beyond middle coxa; temple very short, 0.1 × as long as eye length. In dorsal view, head concave posteriorly, occipital carina present; ocular-ocellar line 1.4 × as long as diameter of lateral ocellus, postocellar line 0.45 as long as diameter of lateral ocellus ( Fig. 5View FIGURE 5 G). Antenna long, with 21 flagellomeres, basal flagellomere 7.0 × as long as wide, subapical segments about 2.5 × as long as wide.

Mesosoma 1.35 × as long as high. Mesoscutum convex, matt with short adpressed dense setae; epomia present; notauli weak and shallow; epicnemial carina complete; in profile scutellum somewhat high, with lateral carinae well developed. Most of mesopleuron and metapleuron polished. Propodeum polished with sparse setae; area superomedia as long as wide, separated from area basalis; costula indistinct, lateral longitudinal carina reduced basally.

small propodeal apophyses present ( Fig. 7View FIGURE 7 A). Fore wing with areolet closed, small, short petiolate and about 2 × longer than high; cu-a inclivous, nearly interstitial. Hind wing with nervellus intercepted below middle; Cu1 present, but weakly pigmented. Hind leg stout, coxa and femur polished, tibia and tarsus coriaceous; hind femur inflated, 3.2 × as long as wide; hind tibia 5.4 × as long as maximum width; basitarsus 0.45 as long as hind tibia.

First metasomal segment arched, 1.7 × as long as posteriorly wide, tergite coriaceous, dorsal longitudinal carinae well developed; spiracle at 0.5, sternite at 0.45 of tergite length. Second tergite 0.75 × as long as its posterior width, coriaceous with small thyridium basally ( Fig. 7View FIGURE 7 A). Remaining tergites of metasoma nearly polished, somewhat compressed laterally from tergite 3. Ovipositor slightly upcurved, about as long as first metasomal segment, tip with distinct subapical dorsal notch.

Mesosoma entirely rufous; head mostly black. Clypeus, mandible, tegula, wing bases, antenna basally yellow, palps whitish yellow. Legs mostly yellowish-brown, fore coxa and trochanters pale, hind coxa with dark band subapically, hind femur and tibia darkened basally and apically. Metasoma mostly brown; tergite 2 entirely yellowish. Wings slightly infumate, veins and pterostigma brown.

Male. Unknown.

Comparison. This species differs from the closely allied G. intercalaris  sp. nov. in the entirely rufous mesosoma; wide and coriaceous face, vein cu-a interstitial; female second tergite entirely pale; areolet with 3rs-m pigmented. It differs from the similar G. laticinctus  in the weak and shallow notauli, fore wing without a dark tip, and rufous metapleuron.

Material examined. Holotype female ( ZISP), French Guiana, Kaw mountains , 40 km SSE Cayenne, 4°33.562' N, 52° 12.425' W, Malaise trap 11.XII.2006GoogleMaps  – 2.I.2007, leg. K. Sarv.

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

Etymology. Named after its rufous mesosoma.


Zoological Institute, Russian Academy of Sciences