EUURA PUNICEA GROUP

Euura humeralis - Shouldered Willow Nematine

Nematus humeralis Serville, 1823
Amauronematus humeralis (Serville, 1823)
Euura squalidus Eversmann, 1847
Amauronematus terminalis Malaise, 1931

North to southern Scotland, reasonably frequent (Musgrove, 2024).

A dark species, normally almost entirely black. A paler form exists with the mesopleura cut through with a reddish brown band. In the female, with some white on the inner orbit, the pronotum, the apex of the abdomen and sometimes all the sternites. Males are best identified by reference to the hypopygium and the penis valves.

Euura humeralis larvae are green with black spines and feed on Grey Willow, Goat Willow, etc. The cerci are conical with sharp points. 

Size: Females: 7.0 - 8.0mm, males: 6.0 - 7.0mm

GB IUCN status: Least Concern
GB rarity status: None

Distribution: England, Scotland, Wales

Flight period: April to May

Plant associations: Salix atrocinerea (Grey Willow), Salix caprea (Goat Willow)

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

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 Natural England, unpublished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