A genus of around 25 species with a broad distribution across the holarctic and neotropical regions. Only one species is present in Britain and Ireland.

The genus Monophadnus is characterised within the Blennocampinae by the following features. In the forewing, the stub vein 2A+3A is straight and simple at the apex. The tarsal claws lack a basal lobe. A partial post-genal carina is present at a level below the eyes. The mesepimeron (the sclerite dorso-posterior to the mesopleuron) is sharply divided into an anterior and posterior portion.

Larvae of the genus are associated with the Ranunculaceae.

Species list:

Monophadnus pallescens (Gmelin, 1790)


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

Gourlay, H. 2007: Old man's beard sawfly. Monophadnus spinolae.The Biological Control of Weeds Book. - Landcare Research, Lincoln, New Zealand : 2pp..

Lacourt, J. 1994: Monophadnus longicornis Hartig et Monophadnus monticola Hartig, deux especes de Blennocampinae inféodées au genre Helleborus (Tourn.) L. (Hymenoptera, Tenthredinidae). - L'Entomologiste. Revue d'Amateurs, Paris 50(6): 335-336

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

Malacari, L.; Pétremand, G.; Cochard, B.; Lefort, F.; Rochefort, S. 2018 [sic]: Écologie saisonnière d'une espèce du genre Monophadnus (Hymenoptera: Tenthredinidae) sur Helleborus spp. et tentative de lutte biologique. - Revue d'Ecologie (Terre et Vie) 73