Euura histrio ZMUO.
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 histrio

description: 220 Euura histrio (Serville, 1823)
Figs 239, 459
Nematus histrio Serville, 1823: 65. Syntypes ♀♀, not examined [A potential syntype is in MNNP: Lacourt 2000]. Type locality: France, Paris.
Nematus rufescens Hartig, 1837: 191–192. Lectotype designated by Schmidt (1997). Synonymy by Konow (1895).
Nematus fur Walsh, 1866: 263. Holotype ♂, destroyed (Sheppard 2004). Type locality not specified, but apparently USA, Illinois. Doubtful synonym (Zinovjev & Smith 2000).
Nematus glenelgensis Cameron, 1882: 535–536. Syntypes ♀♀ (BMNH?), not examined. Type locality: United Kingdom, Scotland, Lochalsh, Glenelg. Synonymy by Konow (1895).
Amauronematus histrio var. nigrescens Enslin, 1915: 375. Lectotype designated below.
Amauronematus histrio var. rubens Enslin, 1915: 375. Syntypes ♀♀, no specimens located. Type locality: not stated.
Amauronematus histrio var. fallaciosus Enslin, 1918: 735.
Diagnosis
Colouration and structure of valvula 3 enable identification of the species. Usually, the black first tergite (rarely extensively pale laterally), completely pale terga 3–5, and at least partly black terga 2 and 6–10 are enough to recognize the species. Black or dark brown pterostigma, usually completely or nearly completely black hind femur and tibia (sometimes anteriorly and posteriorly pale or brown), completely black or slightly pale (at base) cerci, black or laterobasally somewhat pale valvula 3, in lateral view more or less symmetrical (ventrally and dorsally curved to similar degree) valvula 3 help further to identify the females. Euura tota can sometimes also have abdomen with a red band (otherwise mostly black species), but pale tegula and usually at least slightly pale mesepisternum in E. histrio females can be used to distinguish them from E. tota. Males of E. tota with a red band might not be distinguishable from E. histrio.
Female
6.0– 9.5 mm (rounded to nearest 0.5 mm from Schmidt 1997). Pterostigma black or dark brown; hind femur and tibia usually completely or nearly completely black, sometimes anteriorly and posteriorly pale or brown; first tergite black, rarely extensively pale laterally; middle terga (usually 3–5) completely pale, usually at least some of terga 2 and 6–10 partly black; sterna 2–6 pale; hypopygium pale or partly black; valvifer 2 black to pale; cerci completely black or slightly pale at base; valvula 3 black or basally somewhat pale in lateral view; valvula 3 more or less symmetrical in lateral view, ventrally and dorsally curved to similar degree.
Male
5.5–8.0 mm (this study; Schmidt 1997). Pterostigma black, dark brown or centrally paler than externally; hind femur and tibia usually completely or nearly completely black, sometimes hind femur anteriorly and posteriorly pale and hind tibia basally pale or brown; first tergite black; middle terga (3–5) completely pale, terga 2 and 6–8 usually mostly black; sternum 9 black, other sterna pale.
Type material examined
Lectotype Nematus rufescens
GERMANY • ♀; Berlin area; 52° N, 13° E; ZSM, GBIF-GISHym3049.
Lectotype Amauronematus histrio var. nigrescens, here designated
GERMANY – Bayern • ♀; Erlangen; 49.58° N, 10.98° E; 13 Apr. 1914; E. Enslin leg.; ZSM, GBIFGISHym3689.
Holotype Amauronematus histrio var. fallaciosus
GERMANY – Bayern • ♀; Ebenhausen; 50.131° N, 10.138° E; 8 Apr. 1912; ZSM, GBIF-GISHym3688.
Host plants
Salix caprea, S. aurita, S. cinerea L. (Schmidt 1997).
Genetics
COI
Based on 12 specimens, maximum within-species distance is 1.06% and the nearest neighbours, diverging by a minimum of 0%, are Euura stenogaster, E. tota, E. amicula, E. betulae, E. nuorbinjargi, E. rufa, E. septentrionalis, E. striata, E. tenuis, E. hartigi, and E. schlueteri.
Nuclear
Based on 11 specimens, maximum within-species distance is 1.03% (0.82% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.07%, is Euura betulae (DEIGISHym80673).
Distribution and material examined
Palaearctic. Specimens studied are from Bulgaria, Estonia, Finland, France, Germany, and the United Kingdom.
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 pages 153-154, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574