Diplazon parvus, Klopfstein, Seraina, 2014

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 43-44

Diplazon parvus sp. nov.

Etymology. This species is very similar to D. tibiatorius but distinctly smaller, which is reflected in the name parvus .

Diagnosis. (Male unknown). Fore wing length 4.0– 5.2 mm. Antenna with 16 to 17 flagellomeres. Face with punctures strong, clearly distinct from the background sculpture. Mesopleuron smooth and polished and strongly punctate but also with a large impunctate area around mesopleural fovea so that about one quarter of the surface of the mesopleuron is devoid of punctures. Propodeum with a full set of carinae enclosing basal, lateral and petiolar areas. Tergite 1 1.0–1.1 times as long as wide, tergite 2 0.6–0.65 times as long as wide; tergite 2 distinctly punctate on a rugose to even coriaceous background, tergite 3 with punctures very strong on a smooth and polished background, punctures with distinct margins. Transverse impressions distinct on tergites 1–3. Metasoma gradually tapered posterior to third segment.

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 and distinctly punctate over entire surface. 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 smooth and shining between strong punctures, with short but strongly impressed notauli; scutellum smooth and sparsely punctate, with lateral carinae only present basally. Mesopleuron smooth and shining between strong punctures which cover lower half and anterior part of upper half, sternaulus weakly impressed, epicnemial carina complete ventrally. Metapleuron smooth and punctate. Propodeum with a full set of strong carinae; areas between carinae strongly rugose or punctate. Fore wing areolet open, vein 1cu-a opposite vein M; hind wing with three basal hamuli, vein Cu+cu-a broken below middle. Metasoma dorsoventrally depressed, hind margins of all tergites straight or convex; tergite 1 with longitudinal carinae distinct, reaching transverse impression, which is deep, rugose and punctate over entire surface; tergite 2 rugose with some strong punctures and sometimes some coriaceous areas, tergite 3 entirely smooth and shining between strong punctures, both tergites smooth and punctate behind the distinct transverse impressions, tergite 4 weakly punctate basally and usually smoother behind the indistinct transverse impression, remaining tergites smooth. 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 dark brown. Head and mesosoma black, face with yellow along inner orbits, without yellow central face patch, yellow medially on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, shoulder mark, upper mesepimeron; scutellum yellow or ivory at least apically. Legs orange, coxae orange, at least fore and mid coxa with a black base or mainly black; femora orange; hind tibia black-whiteblack banded, hind tarsus dark. Metasoma black, tergite 1 usually with a white apex.

Similar species. This species is very close to D. tibiatorius but differs in size and in details of the sculpture. While D. tibiatorius is strongly punctate over most of the mesopleuron and both tergites 2 and 3, D. parvus has a larger impunctate area around the mesopleural fovea and more strongly rugose or even coriaceous sculpture on tergite 2. Additional, e.g. molecular, data should be sought to confirm the delimitation of these two species. From D. varicoxa , the species can be separated by the lack of a yellow central spot on the face and the mid coxa, which is orange or black, at most with a small yellow spot at the apex.

Type material. Holotype ♀, at NMBE: Switzerland, Bern, Bremgartenwald , 550m, N46°57.58, E7°24.94, Malaise trap, leg. S.Klopfstein, 11.–20. VI. 2008. Labels: “CH/BE Bern, Bremgarten-; wald, Lichtung, Malaisef A; 598.250/200.950 550m; leg. S.Klopfstein; 11–20 VI. 2008 ”, “Extraction-Nb; 8_44; label S.Klopfstein 2010 ”, “Holotype; Diplazon ♀; parvus n.sp.; det. S.Klopfstein 2012”. Paratypes: same as holotype (2♀); Switzerland, Bern, Bremgartenwald , Nägelisbode , 540m, N46°57.96, E7°25.06, Malaise trap, leg. S.Klopfstein : 11.–20. VI. , 20.–27. VI ., 27. VI.–8. VII ., 3.–15. IX. 2008 (1♀ each), all at NMBE. Additional, non-type material as in supplementary material.

Additional material. New for France: Dordogne, St. Marcel du Perigord , leg. R.R.Askew, 1.–19.IX.2006. 1♀, at NMBE. New for Russia: Eastern Siberia, Irkutsk env., leg. Berlov, 30.VIII.2003. 1♀, at MR . New for Spain: Madrid, Casa de Campo, leg. Berlov, 18.VI.1992. 1♀, at MR . New for Sweden: Uppland, Älvkarleby kommun, Bätfors. Pine forest w. blueberry., N60°27.639', E17°19.069', leg. SMTP, 03.VII.–29.VII.2003. 1♀, at NRM .

France (1), Russia (1), Spain (1), Sweden (4), Switzerland (7).

Distribution. Palaearctic.

Figures. Habitus ( Fig. 29 C).

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.