Eutomostethus nigrans

This species is now known to be a colour form of Eutomostethus ephippium.

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References:

Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

Blank, S.M. and Taeger, A., 1998. Comments on the taxonomy of Symphyta (Hymenoptera). Pflanzenwespen Deutschlands (Hymenoptera, Symphyta).–Krefeld, pp.141-174.

Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168

Liston, A., Mutanen, M., Heidemaa, M., Blank, S.M., Kiljunen, N., Taeger, A., Viitasaari, M., Vikberg, V., Wutke, S. and Prous, M., 2022. Taxonomy and nomenclature of some Fennoscandian Sawflies, with descriptions of two new species (Hymenoptera, Symphyta). Deutsche Entomologische Zeitschrift69(2), pp.151-218.

Macek, J. (2014) ‘Descriptions of larvae of the Central European Eutomostethus species (Hymenoptera: Symphyta: Tenthredinidae)’, Acta Entomologica Musei Nationalis Pragae, 54(2), pp. 685–692.