EUURA MYOSOTIDIS GROUP

Euura tibialis - False Acacia Sawfly

Nematus hortensis Hartig, 1837
Pteronidea hortensis (Hartig, 1837)
Pteronus hortensis (Hartig, 1837)
Euura (Pteronidea) tibialis (Newman, 1837)
Hypolaepus (Pteronidea) tibialis (Newman, 1837)
Nematus tibialis Newman, 1837
Nematus (Pteronidea) tibialis Newman, 1837
Pteronidea tibialis (Newman, 1837)
Pteronus tibialis (Newman, 1837)
Nematus xanthobaptus Förster, 1854
Pteronidea trilineata (Norton, 1867)
Nematus trilineatus Norton, 1867
Pteronus trilineatus (Norton, 1867)
Nematus catachloris Snellen van Vollenhoven, 1869
Nematus similaris Norton, 1880
Pteronidea similaris (Norton, 1880)
Nematus robiniae Forbes, 1885
Pteronidea robiniae (Forbes, 1885)
Pteronus solitarius Rohwer, 1908

Throughout England, north to Southern Scotland and west to the Welsh border at time of writing. A long-established introduced species (since early 19th century per Benson) (Musgrove, 2024).

Parthenogenic with males extremely rare. The pale colour is yellowish in life. There is a more or less large black postoccipital spot, that often extends to the occipital field, three black longitudinal marks on the mesonotum, which often coalesce. The dorsum of the abdomen has wide bands on the tergites though the apical tergite is usually pale. The femora are often slightly blackened and the hind tibia and tarsi are blackish. The antennae are sometimes light brown on the underside.

Euura tibialis larvae feed on False Acacia and can be found well into October.

Size: Female: 6.0 - 7.0mm.

GB IUCN status: Least Concern
GB rarity status: None

Distribution: England, Scotland

Flight period: May to Aug

Plant associations: Robinia pseudoacacia (false acacia)

The National Biodiversity Network records are shown on the map below. (See terms and conditions)

References:

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

Muche, W.H., 1974. Die Nematinengattungen Pristiphora Latreille, Pachynematus Konow und Nematus Panzer (Hym., Temthredinidae). Deutsche Entomologische Zeitschrift, 21(1/3), pp.1-137.

Musgrove, A.J. 2024. A review of the status of sawflies of Great Britain - Phase 3: The Tenthredinidae (subfamily Nematinae). Natural England, unpublished

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.63-127