Euura cornuta
Creators: name: Prous, Marko
name: Liston, Andrew
name: Monckton, Spencer K.
name: Kramp, Katja
name: Vårdal, Hege
name: Vikberg, Veli
name: Heibo, Erik
name: Mutanen, Marko
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Tenthredinidae
Euura
Euura cornuta

description: 285 Euura cornuta (Lindqvist, 1962)
Figs 298, 520
Amauronematus cornutus Lindqvist, 1962a: 118–120.
Diagnosis
The males are easy to identify based on the penis valve, pseudoceps of which forms a long filament or spine at the apex. From the other species with a similar penis valve (with spine-like apex of pseudoceps), E. cornuta differs by straight spine of pseudoceps, apically distinctly broadening paravalva, more or less perpendicular apical margin of paravalva in relation to the spine of pseudoceps, and not having a valvispina. The females are more difficult to distinguish from the other species of the group. Nevertheless, the pale clypeus and malar space, black or slightly pale pronotum and tegula, at least apically distinctly black cerci, short valvula 3, straight lancet with 18–19 annuli, and relatively large size (6.5–7.5 mm) should enable identification of the females.
Female
6.5–7.5 mm. Head black to extensively brown around eyes; labrum, clypeus, and malar space pale; supraclypeal area black; thorax black; pronotum black or posteriorly slightly pale; tegula black or slightly pale; pterostigma brown or centrally paler than externally; metafemur black to extensively pale; metatibia pale or brown; hind tarsus black or brown; abdomen mostly black, hypopygium posteriorly and valvifer 2 pale or brown, terga 9–10 black to extensively pale, sometimes also terga 7–8 pale; valvula 3 black or basally slightly pale; cerci distinctly black at least apically; mesepisternum smooth or slightly matt; valvula 3 short, in dorsal view gradually narrowing to an acute tip.
Male
5–7 mm. Head black to extensively brown around eyes; labrum and clypeus pale, malar space pale or black; supraclypeal area black; thorax black; pronotum black; tegula black or slightly pale; pterostigma brown; metafemur black or pale; metatibia pale or brown; hind tarsus black or brown; abdomen black, sternum 9 pale; mesepisternum smooth or slightly matt; projection of tergum 8 indistinct.
Type material examined
Holotype Amauronematus cornutus
FINLAND – Uusimaa • ♂; Kirkkonummi; 60.126° N, 24.439° E; 3 May 1959; V. Karvonen leg.; MZH, http://id.luomus.fi/GL.2466.
Host plants
Salix caprea, S. glauca.
Genetics
COI
Based on 3 specimens, maximum within-species distance is 0.46% and the nearest neighbour, diverging by a minimum of 6.84%, is Euura erecta.
Nuclear
Based on 3 specimens, maximum within-species distance is 0.19% (0.31% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.97%, is Euura erecta (ZMUO.063230).
Distribution and material examined
Palaearctic. Specimens studied are from Bulgaria, Finland, Norway, Russia, and Sweden.
description: Published as part of Prous, Marko, Liston, Andrew, Monckton, Spencer K., Kramp, Katja, Vårdal, Hege, Vikberg, Veli, Heibo, Erik & Mutanen, Marko, 2025, West Palaearctic species of Euura Newman, 1837 (Hymenoptera, Tenthredinidae), pp. 1-377 in European Journal of Taxonomy 977 on page 212, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574