Gnathochorisis intercalaris 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: 211

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Gnathochorisis intercalaris Humala

sp. nov.

Gnathochorisis intercalaris Humala  , sp. nov.

Figs 2View FIGURE 2 D, 4D, 5D, 6D, 7C.

Description. Female. Body length 3.8 mm, fore wing 3.0 mm.

Head 1.2 × as wide as high; frons nearly polished with weak microsculpture; face coriaceous, sparsely punctate, at the level of antennal fossae 0.4 × as wide as head ( Fig. 4View FIGURE 4 D); inner eye orbits subparallel. Clypeus separated from face, approximately 2 × as wide as high, edge of clypeus convex; subocular sulcus present; malar space 1.2 × as long as basal width of mandible; maxillary palps very long, reaching beyond middle coxa. Temple reduced, 0.25 × as long as eye length, occiput impressed; ocular-ocellar line 1.2 × as long as maximum diameter of lateral ocellus, postocellar line 0.8 × as long as maximum diameter of lateral ocellus ( Fig. 5View FIGURE 5 D). Antenna very long, with 21 flagellomeres, basal flagellomere 6.9 × as long as wide, subapical flagellomeres approximately 2 × as long as wide.

Mesosoma 1.4 × as long as high. Mesoscutum convex, matt with short adpressed dense setae; epomia reduced; notauli shallow, indicated anteriorly; epicnemial carina complete; in profile scutellum high, with lateral carinae in anterior half. Most of mesopleuron and metapleuron polished. Propodeum polished with sparse setae; area superomedia slightly elongate and narrowed anteriorly, costulae reduced ( Fig. 7View FIGURE 7 D); small propodeal apophyses present; spiracle of moderate size.

Fore wing with areolet small, short petiolate, 3rs-m depigmented; cu-a clearly postfurcal, hind wing with nervellus intercepted slightly below middle, Cu1 present, distinctly upcurved.

Hind leg stout, coxa and femur polished, tibia and tarsus coriaceous; hind femur inflated, 3.6 × as long as wide; tibia 4.8 × as long as maximum width subapically, with spine-like setae and dense fringe on apex well developed; hind basitarsus 0.45 × as long as hind tibia.

First metasomal segment arched, 1.6 × as long as posteriorly broad, coriaceous, dorsal longitudinal carinae present; spiracle and sternite at 0.45 of tergite 1 length. Second metasomal tergite 0.6 × as long as posteriorly wide, coriaceous ( Fig. 6View FIGURE 6 D). Remaining tergites of metasoma polished, somewhat compressed laterally from tergite 3. Ovipositor upcurved, approximately as long as first metasomal segment.

Fuscous. Basal antennal segments, clypeus, malar space, mandibles, and hind trochanters yellowish; palps, tegulae, fore and mid coxae and trochanters, second tergite pale excluding narrow fuscous apical margin, highly contrasting with other tergites. Hind legs mostly yellowish brown with fuscous maculae: coxae subapically, femora subbasally and subapically, and tibiae subbasally and apically. Wings infumate, veins and pterostigma brown.

Male. Antenna with 22 flagellomeres; tergite 1 black, other tergites dark brown. Apical margin of tergite 4 concave. Parameres nearly parallel-sided ( Fig. 7View FIGURE 7 C). Otherwise as in female.

Comparison. Similar to G. rufithorax  sp. nov. in pale female tergite 2, but differs in the entirely fuscous mesosoma, the narrower and finely sculptured face; fore wing vein cu-a postfurcal; areolet with 3rs-m depigmented; female second tergite with narrow fuscous apical edge. From G. laticinctus  it differs in the weak and shallow notauli, the black mesoscutum, and the fore wing without a dark tip.

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 1 male with same label; 1 male—French Guiana, Montagnes Tortue , 4°15.007' N, 52° 21.512' W, 8.I.2003, leg. V. Soon ( ZISP).GoogleMaps 

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

Etymology. Named after the contrasting coloration of the tergites—the pale second tergite of the female metasoma seems to be inserted between other fuscous tergites.


Zoological Institute, Russian Academy of Sciences