Diplazon nordicus, Klopfstein, Seraina, 2014

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 42-43

Diplazon nordicus sp. nov.

Etymology. This species is named after its northern distribution.

Diagnosis. Fore wing length 5.1–5.8 mm. Antenna in females with 16–17, in males with 17 flagellomeres. Face with punctures disappearing against the coriaceous background. Propodeum with a full set of carinae enclosing basal, lateral and petiolar areas. Tergite 1 0.95–1.0, tergite 2 0.5–0.6 times as long as wide in females, 1.15 and 0.67 in males; tergites 2 and 3 strongly coriaceous and matt, punctures indistinct, sculpture extending across transverse impressions. Transverse impressions deep on tergites 1 to 3. Metasoma dorsoventrally depressed.

Description. Antenna with multiporous plate sensilla evenly distributed also on ventral surface of the flagellomeres. Face centrally only weakly elevated, without vertical depressions; strongly coriaceous, punctures indistinct. Clypeus separated from face by a distinct groove, elevated basally, remainder flat to slightly concave, bilobed, mainly smooth. Head strongly constricted behind compound eyes. Mesoscutum mostly smooth, partly coriaceous between rather sparse, weak punctures, coriaceous sculpture mainly present between the short but strongly impressed notauli; scutellum smooth and sparsely punctate, with lateral carinae only present basally. Mesopleuron smooth and shining on upper half, partly or mainly coriaceous on lower half, and weakly to distinctly punctate, especially along anterior margin and on lower half, sternaulus weakly impressed, epicnemial carina complete ventrally. Metapleuron coriaceous at least on lower part. Propodeum with a full set of strong carinae; areas between carinae strongly rugose. Fore wing areolet open, vein 1cu-a opposite vein M; hind wing with three basal hamuli, vein CU+cu-a broken clearly below middle. Metasoma dorsoventrally depressed, hind margins of all tergites straight or convex; tergite 1 with longitudinal carinae reaching the transverse impression, shape very boxlike, quadrate, rugose and coriaceous over entire surface; tergites 2 and 3 finely rugose and very strongly coriaceous in front of and strongly coriaceous and with some weak indications of punctures behind the distinct transverse impressions, tergite 4 strongly coriaceous basally and usually smoother behind middle, remaining tergites weakly coriaceous basally and smooth apically. Second and third tergites with spiracles dorsal, above lateral folds. Ovipositor sheaths slightly upcurved, tapered, rather stout, with tip closed apically; smooth and shining, with setae around tip and ventrally.

Colouration of females. Antenna black. Head and mesosoma black, face with yellow along inner orbits, without yellow central face patch, yellow or brown on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, and sometimes a small shoulder mark; scutellum with a yellow apical spot. Legs and coxae orange, fore coxa with base dark; femora orange; hind tibia black-white-black banded, hind tarsus dark. Metasoma black.

Colouration of males. As in females but with yellow ventrally on antenna, entire face, upper mesepimeron. Fore and mid coxae largely yellow.

Similar species: This species belongs to the group with strongly coriaceous and matt tergites ( D. angustus , D. hyperboreus , D. zetteli ) but can easily be distinguished from them by the orange and yellow colouration of the coxae. The characters separating it from D. tetragonus , a species with similar colouration and very variable but always with partly shining tergites, are given in the key.

Type material. Holotype ♀, at NRM: Sweden, Småland, leg. Boheman. Labels: “Sm”, “Bhm”, “Holotype; Diplazon ♀; nordicus n.sp.; det. S.Klopfstein 2012” . Paratypes: Lapland (“T. Lp.“), Juli 1926, leg. Röhl (1♀) ; Lapland (“T. Lp.“), 7.–9.VII.1918, leg. Arn (1♀), both at NRM ; Norway, Nord-Trøndelag, Høylandet, stream Skiftesåa, 200m, N64.38°, E12.07°, Malaise trap, leg. Aagaard, Kaare, 1.VII.1986 (1♂), at ZMUO.

Figures. Habitus ( Fig. 29 B).

Figures

FIGURE 29. Habitus of Diplazon species. A. Diplazon laetatorius. B. Diplazon nordicus sp. nov. C. Diplazon parvus sp. nov. D. Diplazon pectoratorius. E. Diplazon scutatorius. E. Diplazon varicoxa.