Exochus carinalis Lee & Choi, 2016

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, Journal of Natural History 50, pp. 2327-2367 : 2334-2335

Exochus carinalis Lee & Choi sp. nov.

( Figures 1d , 3d , 6d )

Specimens examined

Holotype: female, type depository: YNU; ( South Korea) GB, Gyeongsan-si , Dae-dong, Yeungnam Univ., 18 May 1989, E.A. Hong ; Paratype: type depository: YNU; ( Korea) 1 male, GB, Gyeongsan-si, Dae-dong, Yeungnam Univ ., 31 May 1988, J.H. Kwon.

Description

Female. Forewing 6.3 mm, body 7.6 mm. long.

Colour. Black. Upper third of face, scape from below, couple of triangle spots between top of eyes and lateral ocelli, front half of tegula, basal half of mandible, palpi, fore and mid legs, hind coxa and trochanter from below, hind tibia basally and laterally and basal 1 – 4 tarsal segments yellow; fore and mid femur from behind and hind femur red orange; hind half of tegula and hind tibia apically infuscate; flagellum from below brown.

Head. Distinctly narrowed behind eyes. Frons concave behind antennal sockets, with tubercle in front of middle ocellus against interantennal process. Antenna with 36 flagellomeres. First flagellomere 2.2 times as long as wide, all segments elongated. Ocellus large, its diameter 1.1 times as long as distance between eye and lateral ocellus. Temple almost as long as transverse diameter of eye. Clypeus not separated from face. Front tentorial pits not visible. Combined face and clypeus almost square. Occipital carina entirely absent. Hypostomal carina high, lamelliform. Malar space 0.7 times as long as basal width of mandible. Lower tooth of mandible visible only as a trace. Face very coarsely punctate, the distance between points much shorter than their diameter. Clypeus more sparsely punctate. Frons with moderately coarsely punctate, temple more finely punctate.

Mesosoma . Epomia weak, notaulus shallow. Prepectal carina reaching subtegular ridge. Mesopleuron strongly convex, sternaulus not developed. Radial vein originated from middle of pterostigma. Vein Rs+M moderate strongly curved. Vein Cu-a interstitial. Hindwings with eight distal hamuli. Vein cu-a of hindwing weakly inclivous, intercepted in lower 0.2, vein Cu1 of hindwing faint. Legs moderately stout, hind femur 2.3 times as long as wide. Ratio between length of hind tarsal segments as 35: 20: 15: 12: 22. Front spur of mid tibia 0.55 times as long as hind spur. Tarsal claws simple. Propodeum fully areolated with very strong carinae. Area basalis separated from area superomedia by carina. Costula present, originated from front 0.2 of area superomedia. Area dentipara with few long setae on its hind outer angle. Justacoxal carina widened in front as a lamella. Metapleuron with setae on lower half. Propodeal spiracle almost 2.7 times as long as wide, touching pleural carina.

Metasoma. Median longitudinal carinae strong, extending little behind middle of tergite 1. Tergite 2 0.6 times as long as wide apically. Epipleuron of tergite 3 wedge-shaped, the basal three-quarters of edge slightly concave. Metasomal tergites with fine punctures basally.

Male. Corresponds well with female.

Etymology

From fully carinated propodeum.

Distribution

South Korea.

Remarks

The species is close to Exochus nigrifaciatus Momoi, Kusigemati & Nakanishi, 1968 , but differs by its smaller number of flagellomeres, longer first flagellomere, area basalis separated from area superomedia by carina, shorter second metasomal tergite, longer hind femur, body size and coloration of the body.

Figures

Figure 1. Habitus of holotypes in lateral view. (a) Exochus acostulatus Lee & Choi, sp. nov.; (b) Exochus adentatus Lee & Choi,sp.nov.; (c) Exochus areolaris Lee & Choi, sp. nov.; (d) Exochus carinalis Lee & Choi, sp. nov.; (e) Exochus dentisternum Lee & Choi, sp. nov.; (f) Exochus depressus Lee & Choi, sp. nov. Scale bar = 1 mm.

Figure 3. Head in frontal view. (a) Exochus acostulatus Lee & Choi, sp. nov.; (b) Exochus adentatus Lee & Choi, sp. nov.; (c) Exochus areolaris Lee & Choi, sp. nov.; (d) Exochus carinalis Lee & Choi, sp. nov.; (e) Exochus dentisternum Lee & Choi,sp. nov.; (f) Exochus depressus Lee & Choi, sp. nov.; (g) Exochus nigritulus Lee & Choi, sp. nov.; (h) Exochus occipitalis Lee & Choi,sp.nov.; (i) Exochus orbitalis Lee & Choi, sp. nov.; (j) Exochus propodealis Lee & Choi, sp. nov.; (k) Exochus alpinus; (l) Exochus antis. Scale bar = 0.2 mm.

Figure 6. Propodeum in dorsal view. (a) Exochus acostulatus Lee & Choi, sp. nov.; (b) Exochus adentatus Lee & Choi, sp. nov.; (c) Exochus areolaris Lee & Choi, sp. nov.; (d) Exochus carinalis Lee & Choi, sp. nov.; (e) Exochus dentisternum Lee & Choi, sp. nov.; (f) Exochus depressus Lee & Choi, sp. nov.; (g) Exochus nigritulus Lee & Choi, sp. nov.; (h) Exochus occipitalis Lee & Choi, sp. nov.; (i) Exochus orbitalis Lee & Choi, sp. nov.; (j) Exochus propodealis Lee & Choi, sp. nov.; (k) Exochus alpinus; (l) Exochus antis. Scale bar = 0.2 mm.