Orthocentrus koreanus Humala & Lee, 2020

Humala, Andrei E., Lee, Jong-Wook & Choi, Jin-Kyung, 2020, A review of the genus Orthocentrus Gravenhorst (Hymenoptera, Ichneumonidae, Orthocentrinae) from South Korea, Journal of Hymenoptera Research 75, pp. 15-65 : 15

9. Orthocentrus koreanus Humala & Lee sp. nov.

Fig. 7

Description.

Female. Fore wing length 3.7 mm.

Face at level of antennal sockets as wide as high; face smooth, polished, slightly punctate, frons finely pustulate with hairs, temples with fine matt-like coriaceous sculpture; eyes not setose, face slightly prominent, inner orbits slightly divergent ventrally; dorsal ridge of face in between antennal sockets without a median prominence; profile straight except dorsal third slightly impressed, edge of clypeus straight, antennal sockets on a shelf; subocular sulcus distinct, slightly bent towards occiput; labial palp short; maxillary palp reaching slightly beyond fore coxa. In dorsal view, head posteriorly slightly concave, temples short, lateral ocellus distant from eye by its maximum diameter; POL 1.4 times as long as diameter of lateral ocellus; ocellar-ocular groove somewhat developed. Minimum distance between antennal sockets about 2/3 diameter of socket; antenna with 26-27 elongate flagellomeres (n=18) which gradually shorten apically; basal flagellomere 2.0 times as long as wide and about half of scape length; scape slightly convex on inner surface, slightly concave on outer surface.

Mesosoma smooth and polished; mesoscutum with distinct notauli anteriorly indicated; in profile, scutellum somewhat high, metapleuron slightly convex; propodeum with posterior transverse carina present between lateral longitudinal carinae and pleural carina, area superomedia narrowed posteriorly, spiracle medium-sized.

Legs stout, slightly flattened, rather broad; coxae polished, femora polished-coriaceous, tibiae and tarsi coriaceous-granulate; hind femur 2.9-3.0 times as long as high, hind tibia 3.7 times as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow; fore wing with vein Rs+2r meeting centre of pterostigma; areolet closed, small, almost petiolate, 2m-cu meeting areolet at apical 0.7, vein Rs bent towards wing apex; vein cu-a inclivous and slightly distad of Rs&M; nervellus intercepted in lower third.

First metasomal tergite elongate, slightly widening apically, 2.1 times as long as posteriorly wide, coriaceous-rugose, with two nearly parallel, complete or posteriorly almost complete lateromedian longitudinal carinae; with deep transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 1.3 times as long as posteriorly wide, coriaceous-rugose and somewhat strigose; with the central area convex, bounded by well-defined anterolateral oblique furrows connected with posterior transverse impressions originating at about middle of tergite and meeting centrally; thyridia small, oval, contrastingly coloured. Third tergite slightly coriaceous anteriorly, all remaining tergites smooth and polished. Ovipositor slightly upcurved, thin, without dorsal notch; ovipositor sheath narrow, pointed, with long scarce setae.

Body setose except eyes, propleuron, hind corner of pronotum, mesopleuron and metapleuron; setae very scattered on propodeum, tergites and posterior coxae.

Brown to dark brown except face, frontal orbits, malar space, lower temple, hind corner of pronotum, tegula, wing bases, fore and mid legs, narrow apical bands on tergites 2 and 3; hind trochanter and trochantellus and base of hind tibia yellowish brown, mouthparts and sternites creamy. Sometimes face infuscate laterally. Hind coxa apically yellowish-brown.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

Named after the type locality, Korea.

Comparison.

Compared with the other species that have a lenticular head, flattened and smooth face, short temples, and eyes glabrous, O. koreanus has the fore wing areolet closed and 26-27 antennal flagellomeres, unlike in O. brachycerus and O. leei . From the allied O. consobrinus it differs in the yellowish face, more antennal flagellomeres and the first tergite 2.1 times as long as posteriorly wide.

Material examined.

Holotype: female; South Korea, GW: Pyeong-chang-gun Yong-pyeong-myeon Gyebangsan , 28.VI-12.VIII.2012, J.Y. Park leg. (DNUE-0430).

Paratypes: South Korea, CN : 1♀, Daejeon, Donggu, Daejeon University , MT, 12.IV-12.V.2007, J.W. Lee leg. (ZIN-0137); GB : 1♀, Cheongdo-gun, Unmun-myeon, Mt. Unmun (U2), 35°38'50"N, 128°58'19"E, MT, 30.V-16.VI.2009, C.J. Kim leg. (DNUE) ; 1♀, Cheongdo-gun, Unmun-myeon, Mt. Unmun 23.V.2008, J.W. Lee leg. (DNUE-0418) ; 1♀, Mungyeong-si, Gaeun-eup, Wanjang-ri , Mt. Songnisan National Park , Beorimigijae , 36°40'59"N, 127°57'07"E, MT, 17.VII-12.VIII.2013, J.K. Choi leg. (DNUE-0083) ; 1♀, Chilgok-gun, Dongmyeong-myeon, Hakmyeong-ri , Gansansaseong , 36°02'11.7"N, 128°34'18.17"E, MT, 10.VI-1.VII.2015, J.W. Lee leg. (ZIN) ; 1♀, GW: Donghae-si, Samhwa-dong, Mureung valley , MT, 21-30.V.2005, J.W. Lee leg. (ZIN-0472) ; 1♀, Donghae-si, Samhwa-dong, Mureung valley , 35°31'N, 126°53'E, MT, 28.VIII-9. IX.2006, K.B. Kim leg. (DNUE) ; 1♀, Donghae-si, Samhwa-dong, Mureunggyegok , 37°25'45"N, 126°01'17"E, MT, 31.V-5.VI.2005, J.W. Lee leg. (DNUE-0244) ; 1♀, Wonju-si, Panbu-myeon, Mt. Bangtaesan , MT, 30.VII-28.VIII.2013, J.W. Lee leg. (DNUE-0473) ; 1♀, Mt. Taebaeksan , MT, 14.V-20.VI.1999, D.S. Ku (NIAS) ; 5♀, Mt. Taebaeksan, Yuilsa , MT, 20.VI-11.VII.1999, D.S. Ku leg. (NIAS); JB : 1♀, Muju-gun, Mupung-myeon, Hyeonnae-ri , San 3, Mt. Bakseoksan , 35°59'2.79"N, 127°52'30.74"E, 17.VI-2.VII.2015 J.W. Lee leg. (DNUE) ; 1♀, Jeongeup-si, Naejang-dong Naejang-san National Park, Geumseongyegok (14 site), MT, 8-14.VI.2008, J.W. Lee leg. (DNUE-0343); JJ : 1♀, Jeju-si, Yeon-dong, Halla Arboretum , MT, 1-16.V.2012, S.H. Jeong leg. (DNUE-0039) ; 1♀, Jeju-si, Jejudaehak-ro, Cheju National University , 33°27'21"N, 126°33'38"E, MT, 19-26.V.2008, J.W. Lee leg. (DNUE-0251) .

Distribution.

South Korea (CN, GB, GW, JB, JJ).

Figures

Figure 7. Orthocentrus koreanus sp. nov. Holotype. A Habitus in lateral view B head in frontal view C head in dorsal view D head in lateral view E mesosoma in dorsal view F areolet G first to third tergites in dorsal view.