Orthocentrus parvus 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

15. Orthocentrus parvus Humala & Lee sp. nov.

Fig. 12

Description.

Fore wing length 1.7 mm.

Face at level of antennal sockets 1.2 times as wide as high; face punctate, eyes not setose, dorsal ridge of face inbetween antennal sockets without a median prominence; face in profile almost evenly round, slightly more so dorsally, edge of clypeus slightly impressed, antennal sockets on a shelf but shelf not particularly high; subocular sulcus distinct, bent towards occiput; maxillary palp reaching to fore coxa. In dorsal view, head posteriorly slightly concave, temples narrow, lateral ocellus separated from eye by a distance 1.2 times longer than its maximum diameter, POL 1.1 times as long as diameter of lateral ocellus, lacking ocellar-ocular groove. Occipital carina reduced. Minimum distance between antennal sockets slightly more than half diameter of socket; antenna with 23 short flagellomeres which do not gradually shorten towards apex; basal flagellomere subquadrate and about 1/3 of length of scape; scape almost parallel-sided, internal surface slightly convex.

Mesosoma smooth and polished except dorsal propodeum with pustulate microsculpture; mesoscutum with anteriorly indicated notauli; scutellum destroyed by pin, metapleuron slightly convex; propodeum with posterior transverse carina strong, present between lateral longitudinal carinae, lateromedian longitudinal carinae complete, spiracle small.

Legs broad, coxae and femora polished, tibiae and tarsi coriaceous-granulate; hind femur 2.9 times as long as high, hind tibia 4.0 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 nearly as wide as high, 2m-cu meeting areolet at apical 0.7, vein Rs straight; nervellus not intercepted, straight.

First tergite stout, posteriorly slightly widening, 1.4 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 1.2 times as long as posteriorly wide; coriaceous, with faint transverse impressions originating at about middle of tergite, slightly sloping posteriorly, not meeting centrally; thyridia contrastingly coloured. Remaining tergites smooth and polished. Ovipositor straight; ovipositor sheath with dense and long, curved backwards-directed setae.

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

Brown except mouthparts, fore and mid coxae, trochanters and trochantelli, creamy to light yellow, sternites creamy, legs, antennae yellow.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

Named from the Latin Orthocentrus parvus (small, inconspicuous) after its small size.

Comparison.

Compared with the other species that have antennae on a distinct shelf and face finely punctate, the size is smaller (fore wing 1.7 mm), eyes without short setae, the POL shorter, the temples narrower, occipital carina not developed, unlike in O. pacificus . Additionally, compared with other small species, O. parvus has narrow temples, the subocular sulcus is bent and the first flagellomere subquadrate (unlike in O. orientalis ).

Material examined.

Holotype: female; South Korea, GG: Mt. Gwanggyo , Suji-gu, Yongin-si, 214 m, 37°19'56.8"N, 127°02'37.8"E, 15-25.VII.2008, J.W. Lee leg. (DNUE-0562).

Distribution.

South Korea (GG).

Figures

Figure 12. Orthocentrus parvus sp. nov. Holotype. A Habitus in lateral view B head in frontal view C head and mesosoma in dorsal view D head in dorsal view E head and mesosoma in lateral view F fore wing.