Gilen orientalis, Reshchikov & Achterberg, 2018

Reshchikov, Alexey & Achterberg, Cornelis Van, 2018, The Unicorn exists! A remarkable new genus and species of Perilissini (Hymenoptera: Ichneumonidae) from South East Asia, Acta Entomologica Musei Nationalis Pragae 58 (2), pp. 523-529 : 524-528

Gilen orientalis sp. nov.

( Figs 1–2 )

Type material. HOLOTYPE: ♀, ʻTHAILAND, Phitsanulok, Thung Salaeng Luang NP, Moist evergreen forest, 16°50.641’N 100°52.894’E, 557 m., 25.viii.-1.ix.2006, Malaise trap, leg. Pongpitak Pranee, T572ʼ ( QSBG) . PARATYPES: LAOS: ♁, Khammouane, Ban Khoun Ngeun , 18°07ʹN 104°29ʹE, 250 m, 20.‒29.v.2004, Jendek & Šauša leg. ( OLML) ; ♀, THAILAND, Phitsanulok, Thung Salaeng Luang NP , Mix deciduous forest, 16°50.319ʹN 100°51.792ʹE, 479 m., 11.‒18.viii.2006, Malaise trap, Pongpitak Pranee leg., T568 ( QSBG) . THAILAND: ♀, Chiang Mai, Doi Chiangdao NP, Pha Tang substation , 19°24.978ʹN 98°54.886ʹE, 526 m., 2.‒9.xi.2007, Malaise trap, S. Jugsu & A.Watwanich leg., T5701 ( QSBG) ; ♀, Chiang Mai, Huai Nam Dang NP , Guest house, 19°18.803ʹN 98°36.395ʹE, 1589 m, 13.‒20.ii.2008, Malaise trap, Anuchart & Thawatchai leg., T5609 ( QSBG) . VIETNAM: ♁, Dak Lak, Chu Yang Sin NP, Krong K’Mar , 740–900 m., 2.–10.vi.2007, Malaise trap, C. v. Achterberg & R. de Vries leg. ( RMNH) ; 2 ♁♁, Dong Nai, Cat Tien NP, eco-trail, 100 m, 13.–20.vi.2007, Malaise trap, C. v. Achterberg & R. de Vries leg. ( RMNH, IEBR).

Description. Female (holotype). Body matt and sparsely setose. Antenna slender, approximately 1.3 times as long as fore wing and with 42 flagellomeres. Scape almost as long as broad. Head narrowed behind eyes, matt, without punctures and shagreened. Lateral ocellus separated from eye margin by 1.6 times its widest diameter. Face with goblet-shaped (in anterior view) mid-longitudinal projection ( Figs 1A, 1B , 2A ). In its dorsal part it is joined by carina to antennal socket, the distal tip of this projection with a lateral impression. Clypeus 0.4 times as high as wide, not separated from face. Malar space 0.4 times basal mandible width.

Mesoscutum matt, finely punctate. Mesopleuron weakly shining, setose and sparsely punctate. Propodeal carina complete ( Fig. 1C ). Area basalis absent (fused with area superomedia). Area superomedia heptagonal. Spiracles weakly oval, 1.5 times as long as broad. Hind femur 4 times as long as broad. Hind tibia 7 times as long as apically broad. First tarsomere of hind leg 6.6 times as long as broad and 2.1 times as long as second tarsomere. Ovipositor sheath 0.2× as long as hind tibia.

Colouration yellow, except for the following which are marked with black: antenna (dorsally), teeth of mandible, dorsal part of head, pterostigma, fifth tarsomere of fore leg, distal part of first tarsomere and second till fifth tarsomeres of middle leg, hind trochanter, proximal and distal edges of hind tibia and hind tarsus, most of mesonotum ( Fig. 2B ), basal part of propodeum, middle transverse stripe of T1 and anterior parts of further tergites, ovipositor sheath.

Etymology. The specific name is the Latin adjective orientalis (- is, - e) (= eastern, oriental) and refers to species area of distribution.

Distribution. Oriental Region, recorded from Laos, Thailand and Vietnam ( Fig. 3 ).

Figures

Fig. 1. Gilen orientalis sp. nov., holotype ♀. A – lateral habitus; B – face; C – propodeum; D – tarsal claw; E – metasomal tergites dorsally.

Fig. 2. Gilen orientalis sp. nov., holotype ♀ (except E – paratype ♁). A – head laterally; B – head and mesosoma dorsally; C – mesopleuron; D – head ventrally with occipital carina joined hypostomal carina at base of mandible; E – distal sternites of male.

Fig. 3. Gilen orientalis sp. nov. distribution and habitats.A – distribution; B – Malaise trap and habitat in Cat Tien National Park, 100 m.a.s.l. (Dong Nai, Vietnam), C. v. Achterberg ©; C – Malaise trap and habitat in Chu Yang Sin National Park, 740–900 m.a.s.l. (Dak Lak, Vietnam), C. v. Achterberg ©; D –Thung Salaeng Luang National Park of the type locality (Phitsanulok, Thailand), A. Giudici ©; E –, Ban Khoun Ngeun (Khammouane, Laos) E. Jendek©; F – habitat in Doi Chiangdao National Park (Chiang Mai, Thailand), A. Giudici ©.