Heinrichiellus nambui Kikuchi & Konishi, 2015

Kikuchi, Namiki & Konishi, Kazuhiko, 2015, Discovery of a new species belonging to the genus Heinrichiellus Tereshkin (Ichneumonidae, Ichneumoninae, Platylabini), Journal of Hymenoptera Research 45, pp. 31-40 : 33-38

Heinrichiellus nambui Kikuchi & Konishi sp. n.

Figs 1-4 , 5-9 , 10 , 11-12

Holotype.

♀, 35°56'N 138°54'E, Chichibu City, Saitama Prefecture, Honshu, Japan. Data on the label: "Green School, Ootaki, Saitama, Japan 10. VII. 1999 T. Nambu leg. [YPT & MT]". Deposited in the collection of NIAES. Paratypes. 1♀, " 43°00'N, 141°24'E, Hitsujigaoka, Sapporo, Hokkaido, Japan, 20-27. viii. 2003, Malaise trap, K. Konishi", EUMJ; 1♂, " 43°00'N, 141°24'E, Hitsujigaoka, Sapporo, Hokkaido, Japan, 4-11. viii. 2008, Malaise trap, K. Konishi", EUMJ.

Description of female.

Head. Head 1.5 times as wide as long in dorsal view and coriaceous except area between polished antennal sockets (Figs 2 , 3 ); ocellar-ocular length (OOL)/postero-ocellar length (POL) = 1.05 (Fig. 2 ). Frons not concave above each antennal socket; frons with small and distinct tubercle between antennal sockets; antennal sockets large and protruding anteriorly in dorsal view; face 1.2 times as wide as high; inner margins of compound eyes parallel; clypeus strongly convex and transverse, 1.7 times as wide as high, with straight apical margin; anterior tentorial pits large; labrum very wide, 0.8 times as wide as clypeus, with straight apical margin, protruding from under clypeus (Fig. 3 ). Mandible slender, 3.6 times as long as wide at base, gradually narrowed from base to apex, with lower tooth 0.3 times as long as upper tooth. Malar space 2.2 times as wide as base of mandible. Occipital carina complete and separated from hypostomal carina above base of mandible by 1.4 times width of mandibular base; dorso-median part of occipital carina evenly arched. Maxillary palpus extremely long, reaching epicnemial carina; fifth segment 4.0 times as long as mandibular base (Fig. 1 ). Flagellum bristle-shaped, very long and slender; apical flagellomere conical; first flagellomere 8.5 times as long as apical width and 1.7 times as long as second one (Fig. 4 ).

Mesosoma. Collar of pronotum long. Pronotum strigose on coriaceous surface. Mesonotum strongly convex, with notaulus developed to middle of mesonotum; surface of mesonotum granulate with scattered punctures except densely punctate postero-median portion (Fig. 5 ). Epicnemial carina complete; subalar prominence not sharp; impression below speculum not strong; sternaulus distinct, sharp, almost reaching base of middle coxa; postpectal carina absent; surface of mesopleuron obliquely strigose, except speculum slightly polished (Fig. 6 ). Scutellum highly elevated above postscutellum, with lateral carina reaching apex and dorsal surface almost flat; hind margin of metanotum with a triangular projection on each side of postscutellum (Figs 5 , 7 ). Propodeum in profile with area basalis flat and evenly slanted from base of area superomedia; regular carinae of propodeum complete; basal one-third of juxtacoxal carina distinct; area superomedia pentagonal, 1.1 times as long as wide; apex of area dentiparae with very strongly developed and sharp apophysis, almost perpendicular to surface of propodeum, and the apophysis slightly curved downward or almost straight; surface of propodeum rugose; area metapleuralis strigose (Figs 8 , 9 ). Propodeal spiracle 2.5 times as long as wide.

Legs. Legs very slender and long; all legs longer than fore wing. Hind tibia 9.0 times as long as apical width; ratio of length of tibiae fore:mid:hind = 1.0:1.3:1.8. Tarsal claws not pectinate.

Wings (Fig. 10 ). Fore wing 5.9 mm long; areolet 1.8 times as long as 3rs-m, 0.7 times as high as 2m-cu, pentagonal and almost symmetrical; 1m-cu, 2m-cu, and 3rs-m each with single bulla; Cu-a opposite Rs & M; ramulus absent. Hind wing with cu-a one-fourth as long as first abscissa of Cu1.

Metasoma. Metasoma coriaceous (Figs 11 , 12 ). First tergite in profile almost straight, slightly bent downward at base of postpetiole; in dorsal view 4.6 times as long as wide at base; petiole very long, rounded in cross-section, not flattened, of approximately equal width and height; in dorsal view petiole slightly broadened posteriorly; dorso-median carina present only on apical portion of postpetiole (Fig. 11 ). Second tergite in dorsal view 2.8 times as long as wide at base. Gastrocoelus slightly impressed, in form of longitudinal groove. Thyridium oval, distant from base of second tergite by 0.7 times its length. Tergites 3-6 with laterotergites separated by distinct crease. Sternites 2-5 laterally sclerotized and middle part not sclerotized. Hypopygium with apical margin rounded and longitudinally folded in middle. Ovipositor sheath with apex truncate, protruding beyond apex of metasoma (Fig. 12 ).

Coloration. Body ground color reddish to blackish brown (Fig. 1 ). Vertex with a pair of white spots along eye margins (Fig. 2 ); clypeus whitish brown medially and white on lateral quarter; maxillary and labial palpi whitish brown; labrum and flagellar annulus (eighth-eleventh flagellomeres) white. Subalar prominence white; scutellum whitish brown on anterior two-third and white on posterior one-third. Metasoma with seventh tergite white. Ovipositor sheath black; basal quarter and apical portion white.

Description of male

(Figs 13 - 17 ). As in female except for the following characters. Head. OOL/POL = 1.33 (Fig. 14 ); face 1.5 times as wide as high; clypeus 2.0 times as wide as high (Fig. 15 ). First flagellomere 7.1 times as long as apical width and 1.5 times as long as the second one.

Mesosoma. Apophysis of propodeum shorter than that in female, almost straight; area superomedia 1.2 times as wide as long.

Metasoma. Genitalia as in Figures 16 - 17 ; apex of gonosquama rather narrow and curved downwards. Basal apodeme of aedeagus broadened and curved downwards.

Coloration. Body ground color black to dark brown (Fig. 13 ). Vertex with a pair of white spots along eye margins (Fig. 14 ); clypeus and lateral parts of face white; malar space white (Fig. 15 ); maxillary and labial palpi whitish brown; labrum and flagellar annulus (14th-17th flagellomeres) white. Collar of pronotum, subalar prominence and posterior one-third of scutellum white. Fore- and mid-coxae and trochanters white; fore- and mid-femora and tibiae reddish brown; second-fourth hind tarsomeres whitish brown. Metasoma with seventh tergite and genital capsule white (Fig. 17 ).

Distribution.

Japan (Hokkaido, Honshû).

Etymology.

This species is named after Mr. Toshiaki Nambu who collected the holotype.

Remarks.

When this new species is compared with the descriptions of another congener, H. hildegardae , by Tereshkin (1996, 2009), they can be distinguished on the basis of the following key.

Figures

Figure 10. Heinrichiellus nambui sp. n., Holotype, wings. Scale bar = 1 mm.

Figure 17. Heinrichiellus nambui sp. n., Paratype (male) genitalia (A ventral view B gonoforceps in mesal view C aedeagus in lateral view). Scale bar = 0.5 mm.

Figures 1 - 4. Heinrichiellus nambui sp. n., Holotype. 1 habitus 2 head in dorsal view 3 head in frontal view 4 antenna. Scale bars = 1 mm.

Figures 5 - 9. Heinrichiellus nambui sp. n., Holotype. 5 mesonotum to postscutellum in dorsal view 6 mesopleuron 7 scutellum in lateral view 8 propodeum in lateral view 9 carinae of propodeum. Scale bars = 1 mm.

Figures 11 - 12. Heinrichiellus nambui sp. n., Holotype. 11 tergite 1 in dorsal view 12 apex of abdomen in lateral view. Scale bars = 1 mm.

Figures 13 - 16. Heinrichiellus nambui sp. n., Paratype (male). 13 habitus 14 head in dorsal view 15 head in frontal view; 16, apex of abdomen in lateral view. Scale bars = 1 mm.