Nematus scotaspis Förster, 1854a: 307 –308. Described: ♀. Lectotype, ♀, designated by Kopelke (2007a), ZSM [examined]. Type locality: Germany, near Aachen.
Pontania scotaspis: Konow (1890).
Phyllocolpa scotaspis: Benson (1960a).
Nematus (Phyllocolpa) scotaspis: Zhelochovtsev (1988).
Euura (Phyllocolpa) scotaspis: Noblecourt (2016).
Nematus westermanni Boheman, 1852: 173 –174. Described: adult, sex not specified. Syntypes probably lost: could not be located at NHRS. Type locality: Sweden, Skåne, Fågelsång. Syn. nov.
Nematus westermanni Thomson, 1863: 615 –616. Described: ♀, ♂. Lectotype, ♀, designated by Kopelke (2007a), MZLU [examined]. Type locality: southern Skåne. Junior primary homonym of N. westermanni Boheman.
Notes on types and taxonomy. N. westermanni Boheman. Blank et al. (2009) stated that it is not possible to identify this taxon from its description. However, the described coloration and “Scutellum convexum, nigrum, punctulatum” actually fits E. scotaspis very well. N. westermanni Boheman is a nomen oblitum with respect to N. scotaspis Förster (nomen protectum), because the former has not been used as a valid name after 1899, whereas the latter has been used as valid in at least 25 works, published by at least 10 authors in the immediately preceding 50 years and encompassing a span of not less than 10 years (ICZN 1999: 23.9.1).
N. scotaspis. Kopelke (2007a) designated as lectotype a specimen which belongs to this taxon, but the description, as well as biological and distributional data in his subsequent paper (Kopelke 2007c) are all based on misidentified specimens of E. anglica (Vikberg 2010a).
Variability. Female: Body length: 4.6–5.7mm. Colour pattern constant in examined specimens. Male: 4–5mm [according to Benson 1958]. Total number of specimens examined: 8.
Genetic data. None available.
Bionomics. Host plants: Salix viminalis, S. schwerinii; latter in the E. Palaearctic (Vikberg 2010a). According to Beneš (2015a), S. dasyclados is also a host. Biology: Benander (1969).
Distribution. Central and North Europe, north to Skåne (Taeger et al. 2006), Afghanistan (MZLU, examined), Russia (Yakutia) (Popov 2011). Occurrence in Sweden: published records; Skåne: (Benander 1969, Coulianos & Holmåsen 1991). Material examined: Skåne.