Orthocentrus trichoptilus 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

25. Orthocentrus trichoptilus Humala & Lee sp. nov.

Fig. 18

Description.

Female. Fore wing length 2.6 mm.

Face at level of antennal sockets 1.1 times as wide as high; face matt, finely and densely pustulate, frons finely pustulate with hairs, temples with fine matt-like coriaceous sculpture; eyes setose; dorsal ridge of face in between antennal sockets without a median prominence; face in profile almost straight, slightly impressed dorsally, edge of clypeus straight, antennal sockets on a high shelf; subocular sulcus distinct, sharp, bent towards occiput; maxillary palp reaching to about epicnemial carina. Head in dorsal view posteriorly deeply concave, temples distinct, lateral ocellus separated from eye by a distance 2 times 1.3 times longer than its maximum diameter, POL 0.9 times as long as diameter of lateral ocellus, ocellar-ocular grooves lacking. Minimum distance between antennal sockets very narrow, sockets almost touching each other; antenna short, moniliform, with 24 transverse flagellomeres, apical flagellomeres subquadrate, first flagellomere 0.8 times as long as wide and about 1/3 of the scape length, scape nearly parallel-sided.

Mesosoma smooth and polished except mesoscutum and scutellum regularly punctate, dorsal propodeum with coriaceous microsculpture; mesoscutum lacking notauli; in profile, scutellum weakly convex, metapleuron slightly convex; propodeum with posterior transverse carina present between lateral longitudinal carinae, lateromedian longitudinal carinae complete, diverging anteriorly; spiracle small.

Legs broad, coxae polished, femora polished-coriaceous, tibiae and tarsi coriaceous-granulate; hind femur 2.5 times as long as high, hind tibia 3.8 times as long as apical width, with spine-like setae.

Wings not particularly narrow; fore wing with areolet closed, areolet comparatively large, about as high as wide, 2m-cu meeting areolet at apical 0.7, vein Rs straight; nervellus not intercepted, gently curved.

First tergite elongate, posteriorly widening, 1.6 times as long as posteriorly wide; coriaceous-rugose, without developed lateromedian longitudinal carinae. Second tergite 0.7 times as long as posteriorly wide; coriaceous-rugose, posteriorly polished, with shallow transverse impressions originating at about middle of tergite, sloping posteriorly and meeting centrally; anterior thyridia oval-rectangular. Remaining tergites smooth and polished, third tergite with shallow punctures, without thyridia; third tergite sometimes anteriorly narrowly coriaceous-strigose. Ovipositor straight, without notch; ovipositor sheaths slightly widened apically with sparse backward-pointing setae.

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

Dark brown except mouthparts, upper margin of face and small marks between inner orbits and antennal sockets, fore and mid legs, tegula, light yellow; sternites creamy, propleuron ventrally, legs largely except dorsal half of hind coxa and hind femur dorsally yellow; division of dark and pale colours blurred.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

Named from the Greek τρίχα (hair) and οπτικθσ (optics, eye) after the relatively dense setae on the surface of the eyes.

Comparison.

Compared with the other species that have densely setose eyes, the face, mesoscutum, propleuron and mesopleuron are fuscous, the subocular sulcus distinct, the antennae comparatively short with 24 flagellomeres, unlike in O. trichophthalmus , O. hirsutor and O. setosus .

Material examined.

Holotype: female; South Korea; JB: Muju-gun , Mupung-myeon , Hyeonnae-ri San 3, Mt. Bakseoksan, MT, 17.VI-2.VII.2015, J.W. Lee leg. (DNUE).

Distribution.

South Korea (JB).

Figures

Figure 18. Orthocentrus trichoptilus 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 fore wing G first to third tergites in dorsal view.