Gnathochorisis koreensis Humala & Lee

Humala, Andrei E., Choi, Jin-Kyung & Lee, Jong-Wook, 2016, A review of the genera Gnathochorisis Foerster and Symplecis Foerster of South Korea, with notes on Korean orthocentrines (Hymenoptera, Ichneumonidae, Orthocentrinae), ZooKeys 562, pp. 85-104 : 90-93

Taxon classification Animalia Hymenoptera Ichneumonidae

Gnathochorisis koreensis Humala & Lee sp. n. Figs 7-13

Diagnosis.

Fore wing with areolet. Metapleuron polished; notauli well developed, meeting in the centre of mesoscutum. Female frontal orbits fuscous. Second tergite polished, longitudinally striate. Hind femur inflated, 3.0 times as long as wide. From similar Palaearctic Gnathochorisis flavipes Grav. it differs by the presence of closed areolet and the absence of light apical bands on tergites 2-3. Separable from other known Palaearctic Gnathochorisis species with closed areolet by the polished metapleuron, fine sculpture of mesoscutum, long notauli meeting in the centre of mesoscutum, narrow face, entirely fuscous and polished metasomal tergites with longitudinal striae on tergite 2. From the more closely allied Gnathochorisis meridionator Aubert, reported from Russian Far East ( Humala 2007), it differs by the wide and entirely fuscous face, strong, distinct notauli meeting in the centre of the mesoscutum, short metasomal tergites, infuscate hind coxae, and stouter antennae.

Description.

Female (holotype). Fore wing length 3.3 mm.

Head. 1.2 times as wide as high; frons nearly polished with weak microsculpture; face polished, sparsely and finely punctate, at the level of antennal fossae 0.45 times as wide as head (Fig. 8); inner eye orbits subparallel. Clypeus weakly separated from face, approximately 1.8 times as wide as high, edge of clypeus convex; temples short; ocular-ocellar line 1.3 times as long as maximum diameter of lateral ocellus, postocellar line 0.8 times as long as maximum diameter of lateral ocellus (Fig. 9). Antenna moderately long, with 20 (21 in paratype) elongate flagellomeres; basal flagellomere 4.5 times and second flagellomere 3.6 times as high as wide.

Mesosoma. 1.45 times as long as high. Mesoscutum convex, matt with short adpressed dense setae; epomia present; notauli well developed, meeting in centre of mesoscutum (Fig. 9); epicnemial carina complete; in profile scutellum somewhat high, with lateral carinae anteriorly. Most of mesopleuron and metapleuron polished. Propodeum polished with sparse setae; carinae complete and strong; area superomedia slightly transverse (Fig. 10); small propodeal apophyses present; spiracle small. Fore wing with areolet closed, small, short petiolate and slightly longer than high; 3rs-m shorter than 2rs-m (Fig. 11); cu-a inclivous, nearly interstitial. Hind wing with first abscissa of Cu1 inclivous, 2 times as long as cu-a, distal abscissa of Cu1 present but weakly pigmented. Hind leg stout, coxa and femur polished, tibia and tarsus coriaceous; femur inflated, 3.0 times as long as high (Fig. 12); tibia 4.8 times as long as maximum width subapically, with spine-like setae and dense fringe on apex well developed; hind basitarsus 0.35 times as long as hind tibia.

Metasoma. First metasomal segment moderately arched, 2.1 times as long as its posterior width, dorsal longitudinal carina well developed; postpetiole polished, striate laterally; spiracle and end of sternite near middle of tergite length. Second tergite 0.85 times as long as its posterior width, polished with small thyridium basally and oblique longitudinal striae basally and laterally, whereas central and apical parts smooth (Fig. 13). Remaining tergites of metasoma polished, somewhat compressed laterally from tergite 3. Ovipositor upcurved, approximately 0.7 times as long as hind tibia.

Colour. Fuscous. Clypeus, mandible, tegula, wings bases, dorsal corner of pronotum, antenna ventrally yellow, palp whitish yellow. Legs mostly light brown, hind coxa reddish brown, darkened basally, hind femur gradually infuscate to apex, hind tibia somewhat darkened basally and apically. Metasoma fuscous; tergites 2-4 with reddish brown apical bands; thyridium reddish brown. Wings hyaline, veins and pterostigma brown.

Male. Unknown.

Etymology.

Named after the type locality, Korea.

Material examined.

Holotype female (YNU), Korea: GB, Mungyeong-si, Geaun-eup Wanjang-ri, Songnisan National Park, Beorimigijae, 36°40'59"N, 127°57'07"E, Malaise trap, 12 August– 11 September 2013 (J.K. Choi). Paratype female (YNU), Korea: GG, Kwangju-si, Docheong-myeon Mt. Taehwasan, Malaise trap, 15-25 June 2008 (J.K. Choi)

Distribution.

South Korea (GG).