Exochus orbitalis 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 orbitalis

description: Exochus orbitalis Lee & Choi sp. nov.
(Figures 2c, 3i, 6i)
Specimens examined
Holotype: female, type depository: YNU; (South Korea) CB, Dangyang-gun, Danyang-eup, Cheondong-ri, Mt Sobeak birobong, 22 May 1987 (M. T.), leg. J.W. Lee.
Description
Female. Forewing 3.5 mm, body 4.4 mm long.
Colour. Black. Interantennal process, two spots laterally of antennae base, two spots between top of eyes and lateral ocelli, palpi, a spot on front half of tegula, unclear spot before base of hind tibia and basal half of last tarsal segment of hind leg yellow; hind part of tegula, flagellum from below and apically brown; legs reddish, coxae basally and hind tibia except base infuscate.
Head. Transverse, distinctly narrowed behind eyes. Frons smooth and concave above antennal sockets. Antenna with 25 flagellomeres. First flagellomere as seen from above curved outside, thin in the base, widened apically, 2.0 times as long as apical width, all flagellomeres elongated. Ocellus small, its diameter 0.8 times as long as distance between eye and lateral ocellus. Temple 0.7 times as long as transverse diameter of eye. Occipital carina absent dorsally. Inner face orbitae convergent down. Clypeus not separated from face, with straight apical ridge. Front tentorial pits not visible. Combined face and clypeus square. Malar space with distinct furrow, 0.75 times as long as basal width of mandible. Face moderately coarsely and densely punctate, clypeus with more sparse and larger points.
Mesosoma. Epomia present, notaulus moderately deep, extending on front 0.25 of mesoscutum. Prepectal carina reaching subtegular ridge. Mesopleuron moderately convex below subtegular ridge, sternaulus not indicated. Metapleuron smooth and shiny, without setae. Radial vein originated from middle of pterostigma. Vein Rs+M rather strongly curved. Vein Cu-a inclivous, postfurcal at about 0.5 of its length. Parallel vein connected postnervulus below middle. Hindwing with six distal hamuli. Vein cu-a of hindwing almost vertical, intercepted in lower third, vein Cu1 of hindwing faint. Legs stout, hind femur 2.1 times as long as wide. Ratio between length of hind tarsal segments as 22: 11: 10: 6: 10. Front spur of mid-tibia 0.5 times as long as hind spur. Tarsal claws simple. Propodeum fully areolated, area basalis not separated from area superomedia by carina (Figure 6i). Lateromedian longitudinal carinae subparallel, weakly convergent from costula to base of propodeum. Area superomedia narrower from area dentipara, the last with some setae on hind outer angle. Propodeal spiracle almost 2.0 times as long as wide, closer to pleural than to lateral longitudinal carina.
Metasoma. Median longitudinal carinae reaching middle of tergite 1. Tergite 2 0.9 times as long as wide apically. Metasomal tergites moderately densely and finely punctured, the distance between points longer than their diameter. Epipleuron of tergite 3 wedge-shaped with straight edge.
Male. Unknown.
Etymology
From face orbits ventrally convergent.
Distribution
South Korea.
Remarks
The species is close to Exochus convergens Kusigemati, 1971, but differs by its clypeus with straight apical margin, longer malar space, presence of occipital carina laterally, number of flagellomeres, shorter first flagellomere, presence of costula, shorter hind femur 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 2341-2342, DOI: 10.1080/00222933.2016.1197335, http://zenodo.org/record/3993034