Gnathochorisis dilleri 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: 204-207

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Gnathochorisis dilleri Humala

sp. nov.

Gnathochorisis dilleri Humala  , sp. nov.

Figs 2View FIGURE 2 B, 4B, 5B, 6B.

Description. Female (holotype). Body length 3.4 mm. Fore wing length 2.7 mm.

Head 1.2 × as wide as high; frons nearly polished with weak microsculpture, face polished, sparsely and finely punctate, at the level of antennal fossae 0.45 × as wide as head ( Fig. 4View FIGURE 4 B). Inner eye orbits subparallel. Clypeus separated from face, about 2.2 × as wide as high, edge of clypeus convex. Mandibles of unusual sinuous shape, twisted inwards, malar space 1.8 × as long as mandible basal width, with subocular sulcus; maxillary palp long, reaching well beyond fore coxa. In dorsal view, head posteriorly deeply concave, occipital carina complete; temple distinct, but short, 0.1 × as long as eye length; ocular-ocellar line 1.3 × as long as maximum diameter of lateral ocellus, postocellar line 0.6 × as long as maximum diameter of lateral ocellus ( Fig. 5View FIGURE 5 B). Antenna long, not thinned apically, with 19 flagellomeres, basal flagellomere 7.0 × as long as wide, subapical segments about 2.5 × as long as wide.

Mesosoma 1.4 × as long as high. Mesoscutum matt with short adpressed dense setae; epomia present; notaulus weak and shallow; epicnemial carina complete; scutellum with lateral carinae to apex. Propodeum polished; area superomedia parallel-sided, fused with area basalis, costula reduced ( Fig. 7View FIGURE 7 B); apophyses of propodeum resulting from crossing lateral longitudinal and posterior transverse carinae weakly developed. Spiracle of moderate size. Metapleuron polished.

Fore wing with petiolate areolet, longer than high, 2rs-m considerably shorter than 3rs-m; cu-a inclivous, slightly antefurcal; hind wing with nervellus intercepted at lower 0.35, vein Cu1 present. Hind leg stout, coxae and femora polished, tibiae and tarsi coriaceous, hind femur inflated, 3.8 × as long as high. Hind tibia 4.9 × as long as its maximum width subapically, with spine-like setae; basitarsus 0.45 × as long as hind tibia.

First metasomal segment arched, 1.8 × as long as posteriorly broad, coriaceous; dorsal longitudinal carinae strong; sternite at 0.4, spiracle at 0.5 of first tergite length. Second tergite 0.7 × as long as posteriorly broad; polished ( Fig. 6View FIGURE 6 B). Remaining tergites of metasoma polished, somewhat compressed laterally from tergite 3. Ovipositor upcurved, approximately as long as first metasomal segment, tip with distinct subapical dorsal notch.

Face, clypeus, malar space, scape ventrally, propleuron, mesopleuron ventrally, all coxae and hind femora ventrally, and sternites more sparsely with small black papillae, bearing inconspicuous hairs.

Yellowish-rufous. Flagellum, interocellar area, scutellum, postscutellum, first metasomal segment, apical 2/3 of third tergite and most of fourth tergite fuscous. Palps, fore and middle coxae and all trochanters pale. Wings slightly infumate, veins and pterostigma brown.

Male. Unknown.

Comparison. Very similar to G. punctata  sp. nov. in having sinuous mandibles and presence of abundant setiferous punctures on face and ventral surfaces of the body, but differs in the absence of longitudinal striae on tergites 1–2, the area superomedia 2.0 × as long as wide, the light second tergite, and the absence of fuscous marks on the mesoscutum and hind legs.

Material examined. Holotype female ( ZSM), Peru: Dept. Huánuco, 170 km S of Pucallpa, Panguana, Rio Yuyapichis , 9°37ʹ S, 74°56ʹ W; 260 m a.s.l., Malaise trap, VI –IX.2010, leg. E. Diller. 

Distribution. Peru ( Fig. 1View FIGURE 1).

Etymology. The species is named in honor of German ichneumonologist Erich Diller—collector of this species.


Bavarian State Collection of Zoology