Orthocentrus pacificus 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

14. Orthocentrus pacificus Humala & Lee sp. nov.

Fig. 11

Description.

Female. Body length 2.8-3.0 mm, fore wing length 2.2-2.5 mm.

Face at level of antennal sockets 1.1 times as wide as high; face densely punctate, eyes with short indistinct setae, inner orbits divergent ventrally, vertex somewhat prominent; dorsal ridge of face in between antennal sockets without a median prominence; face profile slightly convex, edge of clypeus convex, antennal sockets on a shelf; subocular sulcus distinct, strongly bent towards occiput; maxillary palp long, reaching beyond to fore coxa. In dorsal view, head posteriorly concave, occipital carina weak, widely interrupted dorsally; temples distinct, lateral ocellus distant from eye by a distance 1.7 times longer than its maximum diameter, POL 1.2 times as long as ocellar diameter of lateral ocellus. Minimum distance between antennal sockets about 0.4 × of the diameter of socket; antenna with 24-25 flagellomeres (n=9) which do not gradually shorten towards apex; first flagellomere about 1.1 times as long as wide and about 1/3 of the scape length; scape nearly parallel-sided.

Mesosoma with microsculpture except pronotum with short striations postero-ventrally, propodeum with coriaceous microsculpture; mesoscutum with notauli anteriorly indicated; in profile, scutellum weakly convex, metapleuron slightly convex; propodeum with posterior transverse carina and lateral longitudinal carinae complete, lateromedian longitudinal carinae weak, spiracle small.

Legs slightly flattened; coxae and femora polished, tibiae and tarsi coriaceous; hind femur 2.8 times as long as high, hind tibia 3.5 times as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow, fore wing with areolet closed, clearly transverse, narrowly sessile, 2m-cu meeting areolet at apical 0.7, vein Rs gently bent towards wing apex; vein cu-a distad of Rs&M; nervellus angled below the middle.

First tergite of metasoma elongate, slightly widening posteriorly, 1.6 times as long as posteriorly wide; coriaceous, lateromedian longitudinal carinae weak and indistinct, with shallow transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite nearly parallel-sided, 1.2 times as long as posteriorly wide; coriaceous, with transverse furrows originating at about middle of tergite, sloping posteriorly, meeting centrally; anterior thyridia small, oval, contrastingly coloured; second thyridia vaguely defined, medial, same colour as surrounding cuticle. Third tergite nearly as long as posteriorly wide, coriaceous medio-anteriorly, polished in apical part, with second thyridia round. Remaining tergites unsculptured. Ovipositor not visible; sheaths narrow, with dense setae curved backwards.

Body largely setose except pronotum, mesopleuron and metapleuron; setae scattered on anterior tergites and posterior sides of coxae.

Brown to light-brown except face, clypeus, malar space, lower temple, antenna yellow; mouthparts, tegula, propleuron creamy; all legs yellow; metasoma from tergite 4 light-brown; sternites creamy; sometimes pronotum, propleuron, mesopleuron, scutellum, hind margins of tergites 2-3 orange.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

This species name refers to its geographical distribution - relating to the Pacific Ocean and the region where Korea is situated.

Comparison.

Similar to O. fulvipes Grav. in having an occipital carina, subocular sulcus strongly bent towards the occiput, all legs entirely red, but differs in its smaller size (fore wing 2.2-2.5 mm), the anterior tergites coriaceous without longitudinal striae; the first tergite 1.6 times as long as posteriorly wide, the second tergite 1.2 times as long as posteriorly wide.

Material examined.

Holotype: female; South Korea, GG: Namyangju-si , Choan-myeon , Songcho-ri, Mt. Ungilsan, MT (II), Alt. 134 m, 37°34'43.3"N, 127°18'37.5"E, 27.V-10.VI.2009, J.O. Lim leg. (DNUE-0165).

Paratypes: South Korea, CN: 1♀, Daejeon-si, Dong-gu, Daejeon University , MT, 8.X-30XI.2007, J.W. Lee leg. (ZIN-0129); 1♀, Daejeon-si , Dong-gu , Daehang-no 62, Daejeon University , MT, 15.VIII-30.IX.2006, J.W. Lee leg. (DNUE-0261); GB: 1♀, Gyeongsan-si , Dae-dong , Yeungnam University , MT, 21.IV-19.V.2004, J.W. Lee leg. (DNUE-0126); 1♀, Chilgok-gun , Dongmyeong-myeon , Hakmyeong-ri , San 25, site 23, MT, 36°01'53.45"N, 128°33'46.93"E, 30.VIII-22.IX.2014, J.W. Lee leg. (DNUE); GN: 1♀, Hapcheon-gun , Gaya-myeon , Hwangsan-ri , San 124-3, 10.VII-14.VIII.2014, J.W. Lee (DNUE); GG: 1♀, Mt. Ungilsan , Songchon , Choan , Namyangiu , 134 m, 37°34'43.3"N, 127°18'37.5"E, MT II, 27.V-10.VI.2009, Jongok Lim leg. (ZIN-0171); 2♀, Anyang-si, Manan-gu, Mt. Gwanaksan , 5-19.VII.2007, J.O. Lim leg. (DNUE-0304, 0305); GW: 1♀, Donghae-si, Samhwa-dong, Mureung valley , MT, 1-28.VII.2007, J.W. Lee leg. (DNUE-0298) ;

Distribution.

South Korea (CN, GB, GG, GN).

Figures

Figure 11. Orthocentrus pacificus sp. nov. Holotype. A Habitus in lateral view B head in frontal view C head in dorsal view D head and mesosoma in lateral view E mesosoma in dorsal view F areolet G first to third tergites in dorsal view.