There are thought to be ten species distributed within the Palaearctic region. Only one species is found in Britain and Ireland.
The genus Mesoneura can be characterised by the following features. The antennae are no longer than one and a half times the width of the head, the pedicel is broader than it is long and the third segment is subequal or shorter than the fourth. The left mandible narrows rapidly from the wide base. In the forewing the intercostal vein Sc is basal to where vein M meets Vein R. The cross vein 2r-rs is present in the marginal cell. The base of vein 2A+3A is incomplete and straight such that the basal part of the anal cell is open. The tarsal claws have a long inner tooth but lack a basal lobe.
Larvae feed on trees of the Fagaceae and Pinaceae families.
Mesoneura opaca (Fabricius, 1775)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston, A. D. 2012: On West Palaearctic Mesoneura species (Hymenoptera: Tenthredinidae). - The Entomologist's Monthly Magazine, Brightwood 148(3): 187-194.
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
Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63.
Togashi, I. 1996: Description of a New Species of Mesoneura Hartig from Japan (Hymenoptera, Tenthredinidae). - Japanese Journal of Systematic Entomology, Matsuyama 2(2): 241-243
Wei, M.; Cai, J.; Yang, Q.; Bao, W. 2013: A new species of Mesoneura Hartig (Hymenoptera: Tenthredinidae) with a key to world species. - Entomotaxonomia, Wugong 35(3): 233-240.
Xu, C.-F.; Luo, D.; Yin, L.-X.; Liu, X.-P. 2017: Influence of temperature on the development and reproduction of the camphor sawfly, Mesoneura rufonota (Hymenoptera:Tenthredinidae). - Acta entomologica Sinica, Beijing 60(10): 1216-1225.