Orthocentrus setosus 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

20. Orthocentrus setosus Humala & Lee sp. nov.

Fig. 15

Description.

Fore wing length 2.0-2.1 mm.

Face at level of antennal sockets 1.2 times as wide as high; face coarsely papillate, eyes densely setose, dorsal ridge of face in between antennal sockets without a median prominence; face in profile almost evenly round, edge of clypeus very slightly impressed, antennal sockets on a shelf; subocular sulcus weak and shallow, slightly bent towards occiput; maxillary palp reaching to beyond fore coxa. In dorsal view, head posteriorly slightly concave, temples narrow, lateral ocellus separated from eye by a distance of 2 times longer than its maximum diameter, POL 1.1 times as long as diameter of lateral ocellus, lacking ocellar-ocular grooves. Minimum distance between antennal sockets slightly less than half diameter of socket; antenna comparatively short, with 26 short flagellomeres which do not gradually shorten towards apex; first flagellomere 0.8 times as long as wide and about as long as 1/3 of scape; scape almost parallel-sided.

Mesosoma smooth and polished except dorsal propodeum coriaceous with punctures; mesoscutum lacking notauli; in profile, scutellum weakly convex, metapleuron slightly convex; propodeum with posterior transverse carina strong, present between lateral longitudinal carinae, lateromedian longitudinal carinae complete, and lateral longitudinal carinae present as short stubs not reaching spiracles, spiracle small.

Legs broad, hind coxa large; coxae and femora polished, tibiae and tarsi coriaceous-granulate; hind femur 2.6 times as long as high, hind tibia 3.3 times as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow; fore wing with areolet closed but 3rs-m weak, areolet slightly wider than high, 2m-cu meeting areolet at apical 0.6, vein Rs straight, pterostigma narrow, vein Rs+2r meeting pterostigma at apical 0.6; vein cu-a well distad of Rs&M; nervellus slightly intercepted in lower third, almost straight.

First tergite stout, apically widening, 1.5 times as long as posteriorly wide; coriaceous, without lateromedian longitudinal carinae, with transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 0.7 times as long as posteriorly wide; coriaceous to rugose, with transverse impressions originating at about middle of tergite, slightly sloping posteriorly, meeting centrally; small transverse thyridia contrastingly coloured. Third tergite coriaceous with transverse furrow, posteriorly polished; remaining tergites smooth and polished. Ovipositor short, straight, without dorsal notch; ovipositor sheath invisible.

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

Brown, except mouthparts, orbital marks between eyes and ocelli, fore and mid coxae, trochanters and trochantelli, creamy to light yellow, sternites creamy to brownish creamy, face, clypeus, malar space, scape, propleuron, pronotum, anterior part and lateral patches on mesoscutum, scutellum, mesopleuron, legs, posterior margins of second and third tergites yellow to dull orange.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

Named from the Latin Orthocentrus setosus (setose) after the largely setose body, including eyes.

Comparison.

Compared with the other species that have densely setose eyes, the antennae are comparatively short, with 26 flagellomeres, unlike in O. hirsutor and O. trichophthalmus . From the allied O. trichoptilus it differs in the yellowish face, mesoscutum, propleuron and mesopleuron, the creamy vertex marks and the subocular sulcus hardly visible.

Material examined.

Holotype: female; South Korea, JB: Muju-gun , Mupung-myeon , Hyeonnae-ri , San 3, Mt. Bakseoksan, 35°59'2.79"N, 127°52'30.74"E, 5-18.VIII.2015, J.W. Lee leg. (DNUE).

Paratype: South Korea, GB: 1♀, Gyeongsan-si Dae-dong, Yeungnam University, 4-23.IX.2008, J.W. Lee leg. (DNUE- 0140) .

Distribution.

South Korea (GB, JB).

Figures

Figure 15. Orthocentrus setosus sp. nov. Holotype. A Habitus in lateral view B head and mesosoma in lateral view C wings D propodeum and first to third tergites in dorsal view E head in frontal view F head in dorsal view G mesoscutum in dorsal view.