Leptophion parvus Shimizu & Watanabe

Shimizu, So & Watanabe, Kyohei, 2015, Discovery of the genus Leptophion Cameron, 1901, from Japan and the Palaearctic region, with description of two new species (Hymenoptera: Ichneumonidae: Ophioninae), Zootaxa 4000 (1), pp. 111-122 : 114-117

Leptophion parvus Shimizu & Watanabe sp. nov.

[Japanese name: Hime-usumon-amebachi] ( Figs 1 , 3–5, 9, 11 , 14, 15 )

Type specimen. Holotype. Female, Japan: Chuo-rindo, Amamioshima Is., Kagoshima Pref., 19. ix. 1993 (M. Yoshida, light trap).

Description. Female (Holotype). Body length 16.0 mm.

Head. Face 0.8 × as long as wide, polished, entirely covered with punctures and hairs, with longitudinal ridge on upper central area, and with longitudinal wrinkled along the ridge ( Figs 3–5 ). Clypeus 0.5 × as long as wide, evenly strongly convex with punctures, in lateral profile of lower margin almost straight ( Figs 3, 4 ). Malar space 0.3 × as long as basal width of mandible. Lateral ocelli, without adjacent with eye ( Fig. 5 ). Occiput polished with fine hairs. Temple strongly polished with sparse and short hairs in upper part, and with sparse and long hairs in lower part. Antenna with 62 flagellomeres. First flagellomere 2.1 × as long as second flagellomere, 20th flagellomere 2.0 × as long as its width.

Mesosoma. Mesosoma, polished, entirely covered with hairs. Pronotum polished with sparse puncture with hairs. Anterior margin of mesoscutum in lateral profile with gently concave. Mesoscutum smooth, without notaulus, almost entirely covered with hairs. Scutellum with a lateral longitudinal carina developed on basal 0.8. Epicnemium with wrinkled. Epicnemial carina present, its dorsal end not reaching to anterior margin of mesopleuron. Mesopleuron strongly polished with long hairs. Metapleuron strongly polished with hairs. Submetapleural carina present. Propodeum in lateral profile rounded, with confused carina.

Wings. Fore wing, 13.5 mm, with AI, 1.1; BI, 3.7; CI, 0.3; DI, 0.6; MI, 2.1; ICI, 0.9; SDI, 0.9. Vein 1 m-cu strongly sinuate. Vein Rs +2 r apparently geniculate. Discosubmarginal cell with a glabrous area below pterostigma ( Fig. 14 ). Hind wing with NI, 1.1. Vein Rs strongly curved. Marginal cell of hind wing entirely covered with hairs, its proximal part with an area with isolated dense hairs enclosed by glabrous area ( Fig. 15 ). The angle of the intersection of two veins of hind wing, R 1 and Rs, about 95°. Vein R 1 with five non-uniform hamuli and penultimate one significantly elongated ( Fig. 9 ).

Legs. Distal pecten of hind tarsal claws longer than true apex of claw and other pectens of hind tarsal claw ( Fig. 11 ). Apex of middle and hind tibial spurs strongly curved like a hook.

Metasoma. PI, 2.0; DMI, 1.1. Anterior part of first tergite polished and smooth. Posterior part of first tergite and entire parts of second to eighth tergites polished, entirely covered with dense hairs. Third to fifth sternites, hide under tergites. Ovipositor sheath with long hairs.

Coloration ( Fig. 1 ). Yellowish brown except for: vittae of mesoscutum, posterior part of mesopleuron, anterior part of metapleuron, ventral part of third tergite of metasoma, and fifth to eighth metasomal tergites. Posterior area of mesopleuron, upper half area of metapleuron, and posterior end of propodeum with dark brown marks. Mesoscutum with three longitudinal vittae, both sides of vitta dark brown, middle vitta pale brown. Metasoma gradually darken toward its posterior end, among them dorsal part of third tergite deepest dark brown. Flagellum yellowish brown, basoventral part of flagellar segments on around center of the antenna, with blackish semicylindrical marks. Proximal part of radial cell on fore wing with a clouded area ( Fig. 14 ).

Male. Unknown.

Distribution. Japan (Amamioshima Island) ( Fig. 18).

Bionomics. Host is unknown. The specimen was collected in a light trap.

Etymology. The specific name is from Latin “ parvus ”, which means “small”.

Remarks. In this genus, nine species have the clouded area on proximal part of marginal cell of fore wing. Among them, L. parvus sp. nov. is most similar to L. maculipennis (recorded from the Oriental and Australasian regions) in following combination of character states: (1) in coloration, entirely yellowish brown (exceptions: vittae of mesoscutum, posterior part of mesopleurum, anterior part of metapleuron, a part of metasoma and posterior end of propodeum with dark brown marks) and proximal part of marginal cell on fore wing with clouded area ( Fig. 1 ); (2) vein 1 m-cu strongly sinuate ( Fig. 14 ); (3) the angle of an intersection of two veins of hind wing, R 1 and Rs, around 90° ( Fig. 15 ); and (4) proximal part on marginal cell of hind wing with an area with isolated dense hairs enclosed by glabrous area ( Fig. 15 ), but L. parvus sp. nov. differs from L. maculipennis in following character states: (1) body small and the length of fore wing, less than 14.0 mm (body large and the length of fore wing, more than 15.0 mm in L. maculipennis ) and (2) AI=1.1 (AI= 1.3–1.7 in L. maculipennis ).

Figures

FIGURES 1, 2. Habitus of Japanese species of Leptophion. 1. L. parvus sp. nov. (holotype). 2. L. septentrionis sp. nov. (holotype).

FIGURES 3 – 13. Details of Japanese species of Leptophion. 3 – 5, 9, 11. L. parvus sp. nov. (holotype): 3. head, frontal view; 4. head, lateral view; 5. head, dorsal view; 9. hamuli of right hind wing, dorsal view; 11. pecten of right hind tarsal claw, lateral view. 6 – 8, 10, 12, 13. L. septentrionis sp. nov. (6 – 8, 10, 13. paratype; 12. holotype): 6. head, frontal view; 7. head, lateral view; 8. head, dorsal view; 10. hamuli of right hind wing, dorsolateral view; 12. pecten of right hind tarsal claw, lateral view; 13. mesosoma (surface sculptures on mesonotum, scutellum, and postscutellum omitted), lateral view.

FIGURES 14 – 17. Wing cells of Japanese species of Leptophion. 14 – 15. L. parvus sp. nov. (holotype): 14. discosubmarginal cell of fore wing; 15. marginal cell of hind wing. 16 – 17. L. septentrionis sp. nov. (holotype): 16. discosubmarginal cell of fore wing; 17. marginal cell of hind wing.