Exochus depressus Lee & Choi 2016, sp. nov.
Creators: name: Choi, Jin-Kyung
name: Kolarov, Janko
name: Lee, Jong-Wook
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Exochus
Exochus depressus

description: Exochus depressus Lee & Choi sp. nov.
(Figures 1f, 3f, 6f)
Specimens examined
Holotype: female, type depository: YNU; (South Korea) GG, Namyangju-si, Choan-myeon, Songchon-ri, Mt Ungilsan (M. T.), altitude 134 m, 1 – 26 May 2009, leg., J.O. Lim.
Description
Female. Forewing 3.3 mm, body 4.8 mm long.
Colour. Black. Antenna from below, interantennal process, two spots laterally of antennal base, two spots between top of eyes and lateral ocelli, palpi, front half of tegula, hind upper corner of pronotum, subtegular ridge, femora apically, tibiae except base and
apex, tarsal segments except last one of hind legs and subgenital plate apically yellow; femora reddish.
Head. Roundly narrowed behind. Frons V-shaped concave behind antennal sockets, ocellar area convex. Interantennal process long, extending above base of antennae. Antenna with 24 flagellomeres, short. First flagellomere 1.8 times as long as wide, the reminder flagellomeres transverse. Occipital carina not developed. Hypostomal carina not high. Face strongly convex tranversely (Figure 3f). Temple shorter than transverse diameter of eye (13: 16), not narrowed down. Front tentorial pits not indicated. Combined face and clypeus square. Apical ridge of clypeus weakly arched, in the middle third almost truncate. Malar space with shallow furrow, 0.6 times as long as basal width of mandible. Lower tooth of mandible much shorter than upper tooth.
Mesosoma. Depressed, 2 times as long as high in lateral view (Figure 1f). Epomia present, notaulus short but deep, extending on front 0.2 of mesocutum length. Scutellum flat. Mesopleuron strongly swollen below subtegular ridge, sternaulus not developed. Prepectal carina almost reaching subtegular ridge. Hind middle part of mesosternum projected as a couple of teeth each lateral of mesosternal suture. Metapleuron smooth and lustrous, with some setae in hind lower corner. Radial vein of forewing originated a little before middle of pterostigma. Vein Cu-a postfurcal as 0.5 of its length. Hindwing with six distal hamuli. Vein cu-a of hindwing inclivous, intercepted on its 0.25. Legs stout. Hind femur 2.1 times as long as wide. Ratio between length of hind tarsal segments as 19: 9: 7: 5: 11. Front spur of mid tibia 2 times shorter than hind spur. Tarsal claws simple. Propodeum without costula. Area superomedia weakly convergent basally. Area basalis not separated from area superomedia by carina (Figure 6f). Area dentipara haired basally and with some setae laterally. Propodeal spiracle 2.0 times as long as wide, closer to pleural than to lateral longitudinal carina.
Metasoma. Tergite 1 with short median longitudinal carinae, not reaching its middle. Tergite 2 0.85 times as long as wide apically, with transverse depression basally. Epipleuron of tergite 3 semicircular with basal three-quarters of edge strongly convex. Ovipositor not surpassing tip of metasoma, gradually tapered to apex.
Male. Unknown.
Etymology
From strongly depressed mesosoma.
Distribution
South Korea.
Remarks
The species is close to Exochus latifasciatus Kusigemati, 1971, but differs by body size, longer face, shorter antenna and first flagellomere, smaller number of flagellomeres, entirely absent costula and coloration of the body.
description: Published as part of Choi, Jin-Kyung, Kolarov, Janko & Lee, Jong-Wook, 2016, A taxonomic review of the genus Exochus Gravenhorst (Hymenoptera: Ichneumonidae: Metopiinae) from South Korea with descriptions of ten new species, pp. 2327-2367 in Journal of Natural History 50 on pages 2336-2338, DOI: 10.1080/00222933.2016.1197335, http://zenodo.org/record/3993034