Ichneumon extensorius Linnaeus, 1758

Ichneumon extensorius Linnaeus, 1758 View in CoL

Notes

Similar to I. albiger and I. gracilentus . This species tends to be slightly more uncommon. Exceptionally, it has also been observed in caves ( Seyrig 1926 b). Kolarov (1992) mentions 242 individuals below the bark of an oak, one of the highest records of clustered ichneumonids ever reported. It is also one of the first ichneumonids ever to be reported as a hibernating species, also below bark: “ Mares plures (..) autumno, socialiter sub cortice quercus latentes, (...) ” ( Gravenhorst 1829).

Status: Confirmed.

Records: Austria (1), Belarus (3), Belgium (5), Bulgaria (1), Czechia (2) *, Denmark (7) **, France (26), Germany (19), Ireland (4), Norway (3) *, Poland (2), Romania (8), Russia (4), Sweden (4) *, Switzerland (3), the Netherlands (1), United Kingdom (27).

First record: Ca. 1829 ( Gravenhorst (1829), Germany).

Hibernacula: C (2), DT (849), DTCL (56), DV (6), LV (13), M (22), S (6), U (13).

Sources: Gravenhorst (1829), Tischbein (1863) and Tischbein (1876) [ Ichneumon retractus Tischb. ], Berthoumieu (1894), Kriechbaumer (1896 a), Morley (1903), Meyer (1913), Pfeffer (1913), Pic (1917) and Pic (1919), Seyrig (1923) and Seyrig (1926 b), Hancock (1925), Pax and Maschke (1935), Heinrich (1949 a) / Heinrich (1949 b) and Heinrich (1951), Aerts (1957), Valemberg and Vago (1974 a), Valemberg (1975), Valemberg (1976 a), Valemberg (1978) and Valemberg (1982), Bauer (1984), Kolarov (1992), Gokhman (1993), Hinz and Kreissl (1993), Sebald et al. (2001), Schmidt and Zmudzinski (2005), Sebald (2007), Tschopp et al. (2012), Valemberg and Vago (2013), Verheyde and Quicke (2022); Unpublished: Artsobservasjoner, Artportalen, Coll. RBINS, iNaturalist, Insecte. org, iRecord, Naturbasen, Pers. obs., Pers. obs. (G. Artmann; P. - N. Libert), Tereshkin (2014).

Also mentioned in: Kriechbaumer (1896 b), Tereshkin (2002), Gokhman (2003), Kocot-Zalewska and Domagała (2020).