Diplazon zetteli, Klopfstein, Seraina, 2014

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 48-49

Diplazon zetteli sp. nov.

Etymology. This species is dedicated to the zoologist, entomologist and conservation biologist Prof. Jürg Zettel.

Diagnosis. Fore wing length 5.2–6.5 mm. Antenna in females with 16–17, in males with 17–18 flagellomeres. Face with punctures disappearing against the coriaceous background. Propodeum with a full set of carinae enclosing basal, lateral and petiolar areas. Tergite 1 1.05–1.35, tergite 2 0.6–0.8 times as long as wide; tergites 2 and 3 strongly coriaceous and matt, punctures indistinct, sculpture extending across transverse impressions. Transverse impressions deep on tergites 1 to 3, usually still distinct on tergite 4. 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 coriaceous. Head strongly constricted behind compound eyes. Mesoscutum partly smooth, partly coriaceous between dense but fine 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 with some more or less distinct punctures, especially along anterior margin, 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 or four 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 distinct on about basal half, then replaced by strong longitudinal rugae, with a deep transverse impression, 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 the usually distinct transverse impression, 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, and often small shoulder mark, and sometimes upper mesepimeron; scutellum at most with yellow tip, usually black. Legs orange, coxae black, often with a reddish tinge, hind coxa sometimes orange; 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, often subtegular ridge and mesosternum in front of epicnemial carina. Fore and mid coxae often largely yellow.

Similar species: This species can be distinguished from D. tibiatorius and D. varicoxa by the strongly coriaceous tergites, the punctures absent from the face, the at most very small shoulder marks and the only weakly punctate and partly coriaceous mesopleuron. The latter two characters can also be used to distinguish it from D. angustus , which is probably the most similar species. Diplazon zetteli has more strongly coriaceous tergites which never show distinct punctures, while D. angustus shows at least some punctures on a rugulose background. The subarctic D. hyperboreus is distinctly smaller and darker; see key for diagnostic characters.

Type material. Holotype ♀, at NMBE: Switzerland, Grisons, Sur , Alp Flix , SE Vauastg , Dafora , 1920m, N46°31.482 E9°38.755, Malaise trap, leg. H.Baur, 9.–16. VI. 2003. Labels: “Malaise-F. 2, FO-Nr. 626; CH/GR Sur, SE Vauastg, Dafora 1920m 769.343/; 154.982 leg. H.Baur; 9.– 16.6.2003 ”, “3-C1”, “Holotype; Diplazon ♀; zetteli n.sp.; det. S.Klopfstein 2010 ” . Paratypes: same as holotype (1♀); Switzerland, Grisons, Sur , Alp Flix , Clavenia , 1987m, N46°32.005 E8°50.135, Malaise trap, leg. H.Baur, 2.–9. VI. 2003 (4♀, 2♂) ; 9.–16.VI.2003 (1♀, 1♂) ; Switzerland, Grisons, Sur , Alp Flix , N Gôtet , 1978m, N46°31.945 E9°38.200’, leg. H.Baur, 4.VI.2003 (1♂) ; Switzerland, Grisons, Sur , Alp Flix , W Piz d’Umblei , 1928m, N46°31.655 E9°38.674’, leg. H.Baur, 3.VI.2003 (1♂) ; Switzerland, Glarus, Linthal , Obersand , Melchplatz , 2051m, N46°50.387 E8°55.821’, Malaise trap, leg. S.Klopfstein, 19.–28.VI.2008 (1♀) , 28.VI–10.VII.2008 (1♀) ; all at NMBE; Switzerland, Valais, Col de Bretolet , 1900m, N46°08.6’ E6°47.8’, 24.–25.VI.1964 (3♀) , 11.–15.VIII.1965 (1♀) , 14.–15.VII.1964 (2♀) , 27.VII.–2.VIII.1963 (1♂) , all at MZL.

Additional material. New for Austria: Tirol, Königstal, Obergurgl, 2000m, leg. Fitton & Day, VII.1981. 2♂, 3♀, at BMNH . New for Russia: Siberia, Cape Shartlai, Baikal lake, leg. O.Berlov, 20.VI.2004. 1♀, at MR.

Austria (5), Russia (1), Switzerland (30).

Distribution. Palaearctic.

Figures. Metasomal sculpture ( Fig. 18 C), habitus ( Fig. 30 A), male terminal sclerites ( Fig. 37 D).

Figures

FIGURE 18. Sculpture of the proximal tergites in the genus Diplazon. A. Diplazon tetragonus ♀, first three tergites showing transverse impressions and a partly rugulous and coriaceous sculpture in front of the impressions. B. Diplazon scutatorius ♀, first three tergites with strong transverse impressions and strong punctures. C. Diplazon zetteli ♀, strongly coriaceous sculpture extends to hind part of the tergites. Scale bars represent 500 µm.

FIGURE 30. Habitus of Diplazontinae species. A. Diplazon zetteli sp. nov. B. Enizemum ornatum. C. Episemura ensata. D. Eurytyloides umbrinus sp. nov. E. Fossatyloides gracilentus. F. Homotropus crassicornis.

FIGURE 37. Ninth sternite and ninth and tenth tergites of male Diplazontinae species. A. Daschia brevitarsis. B. Diplazon angustus. C. Diplazon scutatorius. D. Diplazon zetteli. E. Enizemum ornatum. F. Homotropus dimidiatus. G. Homotropus longiventris. H. Homotropus melanogaster. I. Homotropus nigrolineatus. J. Phthorima xanthaspis.