Euura oblita (Serville, 1823)

Liston, Andrew D., Heibo, Erik, Prous, Marko, Vårdal, Hege, Nyman, Tommi & Vikberg, Veli, 2017, North European gall-inducing Euura sawflies (Hymenoptera, Tenthredinidae, Nematinae), Zootaxa 4302 (1), pp. 1-115 : 77

Euura oblita (Serville, 1823)

Nematus oblitus Serville, 1823: 72 . Described: ♀. Lectotype, ♀, designated by Blank & Taeger (1998), MRSN [not examined]. Type locality: France, Paris.

Phyllocolpa oblita: Blank & Taeger (1998) .

Euura oblita: Beneš (2015b) .

Nematus oblitus Lepeletier, 1823: 69 . Described: ♀. The lectotype is the same specimen as designated for N. oblitus Serville [see above]. Type locality: France, near Paris.

Nematus pineti Hartig, 1837: 208 . Described: ♀, recorded host: Rothtanne [ Picea abies ]. Lectotype, ♀, designated by Kopelke (2007a), ZSM [not examined]. Type locality: Berlin area ["bei uns"]. Used as a valid name, with puella as a synonym, by Dalla Torre (1894).

Nematus pleurostictus Förster, 1854b: 432 –433. Described: ♂. Holotype [Förster's description of damage makes it clear that he only had one specimen], ♂, ZSM [examined]. Type locality: near Aachen. Synonymy with Phyllocolpa oblita by Taeger et al. (2010), based on examination of the type by V. Vikberg.

Nematus puella Thomson, 1871: 160 . Described: ♀. Lectotype, ♀, designated by Kopelke (2007a), MZLU [examined]. Type locality: Sweden, Skåne.

Pontania puella: Konow (1890) .

Phyllocolpa puella: Benson (1960a) .

Pontania (Phyllocolpa) puella: Viitasaari & Vikberg (1985) .

Nematus (Phyllocolpa) puella: Zhelochovtsev (1988) .

Variability. Female: Body length: 4.0– 5.8mm. Head with only a small black fleck around each ocellus, varying to a large black patch covering whole ocellar area. Black markings on mesoscutum more or less extensive. Metapleuron from entirely black to nearly completely pale. Terga 1–7 black except for downturned lateral margins, or nearly entirely pale. Ratio of length flagellomere 2 / height of eye 1.02–1.18. Male: 4.0– 4.8mm. Colour variability similar to female, but male on average much darker, e.g. mesoscutum and mesoscutellum completely black. Black mesepisternum with brown fleck on upper half, or completely black. Metafemur with narrow black stripe on posterior edge, to extensively black basally. All abdominal sterna pale, varying to basal sterna mainly black. Total number of specimens examined: 16.

Genetic data. The COI barcodes obtained for E. oblita are closely similar to those of the nominal taxa belonging to the E. ischnocera complex, with the possible exception of E. plicalapponum .

Similar species. E. oblita resembles species of the ischnocera complex, but the latter have a much darker colour pattern, shorter flagellomeres (ratio length flagellomere 2 / height of eye 0.76-1.03), and less acute lancet serrulae: e.g. Fig. 31 ( E. oblita lancet: Fig. 28 ).

Bionomics. Host plants: Salix alba , S. × fragilis , S. × rubens ( Kopelke 2007a), S. triandra ( Lorenz & Kraus 1957, Beneš 2015a), S. babylonica , S. vitellina ( Beneš 2015a) . Biology: Kopelke (2007a).

Distribution. Central Europe (Taeger et al. 2006), British Isles ( Benson 1958), southern Scandinavia ( Coulianos & Holmåsen 1991), Turkey ( Benson 1968), Yakutia ( Popov 2011). Occurrence in Sweden: published records; Skåne ( Thomson 1871, Benander 1969), Öland ( Coulianos & Holmåsen 1991), Västergötland ( Benander 1969), Bohuslän ( Coulianos & Holmåsen 1991), Jämtland (Haris 2009). Material examined: Skåne.

Figures

FIGURES 27 – 31. Euura, lancets; 27 scotaspis (31752) 28 oblita (31753) 29 destricta (31754) 30 anglica (31755) 31 prussica (31756)