Leptophion septentrionis 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 : 117-118

Leptophion septentrionis Shimizu & Watanabe sp. nov.

[Japanese name: Oo-usumon-amebachi]

( Figs 2 , 6–8, 10, 12, 13 , 16, 17 )

Type series. Holotype. Female, Japan: Anbo-rindo, 350 m alt., Yakushima Is., Kagoshima Pref., 22. vii. 1982 (K. Konishi & S. Yoshimatsu, light trap). Paratype. 1 female, Japan: Mt.Yuwandake, Amamioshima Is., Kagoshima Pref., 11. v. 1983 (S. Yoshimatsu & S. Nomura, light trap).

Description. Female (n=2). Body length 25.0–27.0 mm (holotype: 27.0 mm) ( Fig. 2 ).

Head. Face 0.7–0.8 (holotype: 0.8) × as long as wide, entirely covered with punctures and hairs, with longitudinal ridge on upper central area ( Figs 6–8 ). Clypeus 0.5 × as long as wide, evenly strongly convex with punctures, in lateral profile of lower margin almost straight ( Figs 6, 7 ). Malar space 0.3 × as long as basal width of mandible. Lateral ocelli adjacent with eye ( Figs 7, 8 ). Occiput polished with fine white hairs. Temple strongly polished with sparse and short hairs in upper part, and with sparse and long hairs in lower part. Antenna with 67–71 (holotype: 71) flagellomeres. First flagellomere 2.1 × as long as second flagellomere, 20th flagellomere 1.9–2.0 (holotype: 1.9) × as long as its width.

Mesosoma. Pronotum with widely wrinkled on posterior part and lower half part ( Fig. 13 ). Anterior margin of mesoscutum in lateral profile with gently concave ( Fig. 13 ). Mesoscutum smooth, without notaulus, almost entirely covered with hairs. Scutellum with a lateral longitudinal carina developed on basal 0.8. Epicnemium with densely and obliquely wrinkled. Epicnemial carina present, its dorsal end not reaching to anterior margin of mesopleuron. Mesopleuron partly covered with longitudinal wrinkles and entirely covered with long hairs ( Fig. 13 ). Metapleuron polished with hairs. Submetapleural carina present. Propodeum in lateral profile rounded, with confused carina.

Wings. Fore wing, 17.0–18.0 mm (holotype: 18.0 mm), with AI, 1.0; BI, 3.1–3.4 (holotype: 3.4); CI, 0.3; DI, 0.5; MI, 2.6–2.8 (holotype: 2.6); 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. 16 ). Hind wing with NI, 1.1–1.3 (holotype: 1.3). 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. 17 ). The angle of an intersection of two veins of hind wing, R 1 and Rs, about 95°. Vein R 1 with 5–6 ununiformed hamuli (holotype: 6) and penultimate one significantly elongate ( Fig. 10 ).

Legs. Distal pecten of hind tarsal claws longer than true apex of claw and other pectens of hind tarsal claw ( Fig. 12 ). Apex of middle and hind tibial spurs strongly curved as hook-like.

Metasoma. PI, 2.5–2.6 (holotype: 2.5); DMI, 1.1–1.3 (holotype: 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. Second sternite to anterior part of third sternite, polished, with sparsely long hairs. Posterior part of third sternite to fifth sternite, polished, with fine microtrichia, long hairs along the ventral margin. Ovipositor sheath with long hairs.

Coloration ( Fig. 2 ). Yellowish brown except for: vittae of mesoscutum, posterior part of mesopleuron, anterior part of metapleuron, and third to eighth metasomal tergites. Posterior area of mesopleuron, upper half area of pleuron, 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, seventh and eighth metasomal tergites entirely dark or grayish brown. Flagellum yellowish brown, basoventral part of flagellar segments on around center of the antenna, with blackish semicylindrical marks. Proximal part of marginal cell on fore wing with a clouded area ( Fig. 16 ).

Male. Unknown.

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

Bionomics. Host is unknown. All specimens were collected in light traps.

Etymology. This species has the northernmost distribution within Leptophion , so that the specific name is from Latin “septentrio”, which means “north”.

Remarks. In this genus, nine species have the clouded area on the proximal part of marginal cell of fore wing. Among them, L. septentrionis sp. nov. is most similar to L. maculipennis (recorded from Australasian and Oriental regions) in the following combination of character states: (1) in coloration, entirely yellowish brown (exceptions: vittae of mesoscutum, posterior part of mesopleuron, 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. 2 ); (2) vein 1 m-cu strongly sinuate ( Fig. 16 ); (3) the angle of an intersection of two veins of hind wing, R 1 and Rs, around 90° ( Fig. 17 ); and (4) proximal part on marginal cell of hind wing with an area with isolated dense hairs enclosed by glabrous area ( Fig. 17 ), but L. septentrionis sp. nov. differs from L. maculipennis in the following character states: (1) mesopleuron with longitudinal wrinkles (mesopleuron strongly polished and without wrinkles in L. maculipennis ) ( Fig. 13 ) and (2) AI=1.0 (AI= 1.3–1.7 in L. maculipennis ). L. septentrionis sp. nov. is also similar to L. parvus sp. nov., but it can be distinguished by the following combination of character states: (1) body large and the length of fore wing, 17.0–18.0 mm (body small and the length of fore wing, 13.5 mm in L. parvus sp. nov.); (2) mesopleuron with longitudinal wrinkles (mesopleuron strongly polished and without wrinkles in L. parvus sp. nov.) ( Fig. 13 ); and (3) pterostigma of fore wing with a clouded membranous area (pterostigma with a transpicuous membranous area in L. parvus sp. nov.) ( Fig.14 ).

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.