Barycnemis naganoensis Khalaim

Khalaim, Andrey I., 2015, A review of the Japanese species of Barycnemis Förster (Hymenoptera: Ichneumonidae: Tersilochinae), Zootaxa 3963 (3), pp. 425-433 : 429-430

Barycnemis naganoensis Khalaim , sp. nov.

( Figs 8–20 )

Comparison. The new species belongs to the harpura species group as it has a slender and laterally more or less smooth (at least basally) first metasomal segment, curved foveate groove of mesopleuron ( Figs 13, 14 ) and slender ovipositor ( Fig. 20 ). In the key to Palaearctic species of Barycnemis ( Khalaim 2004: 47) , B. naganoensis runs to couplet 3, but does not correspond with either side of the couplet as it has a flagellum with 22–23 flagellomeres ( Fig. 8 ), basal area of propodeum longer than the apical area ( Fig. 15 ) and hind basitarsus shorter than tibia ( Fig. 19 ). Within the harpura species group, B. naganoensis is most similar to B. dissimilis but differs by its evenly granulate dorsolateral areas of propodeum ( Figs 13, 15 ), weaker and narrower basal area of propodeum ( Fig. 15 ), shorter hind basitarsus ( Fig. 19 ), less slender (in lateral view) first metasomal segment, which is striate laterally before the glymma, and longer and less upcurved ovipositor ( Fig. 20 ). Barycnemis naganoensis also resembles B. blediator (Aubert) as both have the hind femur and tibia more or less equal in length, hind basitarsus somewhat shorter than hind tibia and first metasomal segment striate laterally, but differs from this species by the slenderer antennal flagellum ( Fig. 8 ), shorter malar space, wider and anteriorly curved foveate groove of mesopleuron ( Figs 13, 14 ) (more or less linear in B. blediator ), longer metacarpus ( Fig. 18 ), slenderer hind femur and tibia ( Fig. 19 ), first tergite less striate laterally, longer ovipositor ( Fig. 20 ) and somewhat longer body (body length is 3.0– 3.5 mm in B. blediator and almost 4.0 mm in B. naganoensis ).

Description. Female. Body length 3.9 mm. Fore wing length 3.3 mm.

Head rather strongly narrowed, weakly rounded behind eyes in dorsal view ( Fig. 10 ); temple 0.75× as long as eye width. Clypeus lenticular, 3.1× as broad as long ( Fig. 12 ), slightly convex in lateral view, smooth, finely punctate in upper 0.4. Mandible with upper tooth distinctly longer than lower tooth. Malar space about 0.6× as long as basal mandibular width. Antennal flagellum ( Fig. 8 ) filiform, very slender, with 22–23 flagellomeres (23 flagellomeres in holotype); subbasal flagellomeres about 2.5×, mid flagellomeres 2.0×, and subapical flagellomeres 1.1–1.2× as long as broad ( Fig. 8 ); flagellomeres 4–6 bearing finger-shaped structures at apex on outer surface ( Fig. 9 ). Face with weak median prominence in upper part. Head, in profile, with antennae near centre (not displaced downwards) ( Fig. 11 ). Face, frons and vertex finely granulate, dull; face with fine punctures centrally. Temple smooth and shining, with very fine (sometimes indistinct) punctures. Occipital carina complete.

Mesoscutum granulate, dull, impunctate. Scutellum with lateral longitudinal carinae only at extreme base. Notaulus developed, with fine irregular wrinkles anterolaterally ( Figs 13, 17 ). Mesopleuron granulate peripherally, smooth and finely punctate centrally (above foveate groove) and dorso-posteriorly ( Fig. 14 ). Foveate groove long, extending from upper end of epicnemial (prepectal) carina to lower posterior corner of mesopleuron, weakly upcurved in anterior half, moderately broad, with fine transverse wrinkles ( Figs 13, 14 ). Dorsolateral area of propodeum finely and evenly granulate, dull, impunctate ( Fig. 15 ). Basal area of propodeum indistinct, propodeum mediodorsally more densely granulate or with fine irregular wrinkles. Basal part of propodeum about 1.5× as long as apical area ( Fig. 15 ). Propodeal spiracle separated from pleural carina by 0.5–1.5× diameter of spiracle. Transverse carina of propodeum laterally weak, sometimes vanishing. Apical area granulate, laterally with fine irregular wrinkles, flat, widely rounded anteriorly; apical longitudinal carinae strong posteriorly and weak anteriorly, usually not reaching transverse carina anteriorly.

Fore wing ( Fig. 18 ) with second recurrent vein (2 m-cu) postfurcal. Intercubitus (2rs-m) short and thick, distinctly shorter than abscissa of cubitus between intercubitus and second recurrent vein (abscissa of M between 2 rs-m and 2 m-cu). First abscissa of radius (Rs +2 r) distinctly longer than width of pterostigma. First and second sections of radius (Rs +2 r and Rs) meeting at right angle. Metacarpus (R 1) not reaching apex of fore wing. Postnervulus intercepted distinctly below its middle. Hind wing with nervellus (cu 1& cu-a) reclivous ( Fig. 18 ).

Legs moderately slender ( Fig. 19 ). Hind femur 4.3–4.6× as long as broad, almost as long as tibia. Hind basitarsus 0.75–0.85× as long as hind tibia. Spurs of hind tibia strongly curved apically. Tarsal claws not pectinate.

First tergite slender, 4.6× as long as posteriorly broad, predominantly smooth, very finely striate laterally before glymma and sometimes also dorsally in centre. Glymma rather deep, joining by strong furrow to ventral part of postpetiole. Second tergite 2.6× as long as anteriorly broad ( Fig. 16 ). Thyridial depression more than 3.0× as long as broad. Ovipositor very slender, weakly and evenly upcurved, without dorsal subapical depression ( Fig. 20 ); sheath about 1.2× as long as first tergite and hind tibia.

Head, mesosoma and first metasomal segment black with slight brownish tinge. Palpi, mandible (teeth reddish), lower 0.6 of clypeus and tegula yellow. Antenna brown basally to almost black apically, scape and pedicel ventrally yellowish. Wings slightly infumate with brown, pterostigma brown. Legs yellow to yellowish brown, hind coxa dark brown, hind femur sometimes brownish, hind tarsus fuscous. Metasoma behind first tergite yellowbrown ventrally, brown to dark brown laterally and dorsally.

Male. Flagellum narrowed towards apex, with 23–25 flagellomeres ( Fig. 17 ). Basal part of propodeum shorter, just a little longer than apical area. Base of metasoma slenderer. Otherwise similar to female.

Variation. This is a very uniform species with minor variation is structure and colouration.

Etymology. The species is named after the type locality, Nagano Pref.

Material examined. Holotype female ( NIAES), Japan, Chūbu Region, Nagano Pref., Shimashima-dani, 1000–1300 m, 28.VII.1980, coll. H. Takemoto. Both hind legs absent.

Paratypes. Japan, Chūbu Region: 2 ♂ ( NIAES, ZISP) same data as holotype, but coll. K. Maetô. 1 ♀ ( ZISP) same data, but 27.VII.1980. 1 ♀ ( NIAES) Nagano Pref., Tateshina-kōgen, 10.X.1982, coll. Tadao Gotō. 1 ♀ ( NIAES) Shizuoka Pref., Mt. Fuji, 24.VII.1969, coll. H. Hasegawa. 1 ♂ ( NIAES) Yamanashi Pref., Minami-Alps, Mt. Kitadake, 28.VIII.1980, coll., T. Gotô. 1 ♂ ( NIAES) Niigata Pref., Asahi-mura, Mt. Shindo-dake, 5.VI.1980, coll. K. Maetô.

Distribution. Japan (central Honshū I.).

Figures

FIGURES 6 – 12. Barycnemis harpura, ♀ (Japan): 6 — posterior part of mesosoma and hind leg (without apex of tarsus), lateral; 7 — propodeum, dorsolateral. Barycnemis naganoensis sp. nov., ♀, holotype (10, 11) and paratype (8, 9, 12): 8 — head with antennae and mesoscutum, lateral; 9 — base of flagellum, lateral; 10 — head and mesoscutum, dorsal; 11 — head and anterior part of mesosoma, lateral; 12 — head, front.

FIGURES 13 – 17. Barycnemis naganoensis sp. nov., ♀ (13 – 16) and ♂ (17), holotype (13, 15, 16) and paratype (14, 17): 13 — head and mesosoma, lateral; 14 — mesosoma, ventrolateral; 15 — propodeum, dorsal; 16 — postpetiole and second tergite, dorsal; 17 — head with antennae, dorsolateral.

FIGURES 18 – 20. Barycnemis naganoensis sp. nov., ♀, paratype: 18 — wings; 19 — hind leg (without apex of tarsus; the arrow points to the apical end of the basitarsus), lateral; 20 — apex of metasoma with ovipositor, lateral.