A large Tenthredo with most of the upper surface black and most of the lower surface lime green. The stigma of the fore wing is black. Similar to Tenthredo mioceras. Both have green mesopleura with a subvertical black stripe. In mesomela the mesopleura is coriaceous above but shining below and the hairs on the head are fuscous, whereas in mioceras the mesopleura has coriaceous sculpture all over and the hairs are silvery. Also in mioceras the postocellar area is more rectangular with the front margin clearly longer than the side margins, whereas in mesomela the postocellar area is more squarish with the front margin only slightly longer than the side margin. Tenthredo mesomela is a generalist in habitat terms whilst mioceras is associated with upland moors.
The larvae feed on a broad range of plants.
Size: 9.5 - 13mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to July
Plant associations: Veronica (speedwells), Ranunculus (buttercups), Epilobium (willowherbs), Tussilago (coltsfoot), Rumex (docks), Salix (willows), Heracleum (hogweed), Arctium lappa (greater burdock), Polygonum persicaria (redshank).
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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, 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
Fekete, K. (2018) Beginner’s guide to identifying British Tenthredo, Natural History Museum, London. http://www.nhm.ac.uk/content/dam/nhmwww/take-part/identification-trainers/sawflies-guide-id-trainees.pdf [Accessed 26Apr2019]