Euura tillbergi
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 tillbergi

description: 264 Euura tillbergi (Malaise, 1921)
Figs 284–289, 489–491
Amauronematus tillbergi Malaise, 1921b: 125–126. Lectotype designated below.
Amauronematus tillbergi var. foveifrons Malaise, 1921b: 126–127. Lectotype designated below. Synonymy by Lindqvist (1941b).
Amauronematus latisulcatus Malaise, 1931b: 45–46. Syn. nov.
Amauronematus pacificus Malaise, 1931b: 47–48. Lectotype designated below. Secondary homonym of Pontania pacifica Marlatt, 1896 [Euura pacifica (Marlatt, 1896)]. Syn. nov.
Amauronematus mcluckieae Benson, 1935: 31–32. Mandatory correction of original orthography mcluckiei. Syn. nov.
Amauronematus rex Benson, 1948b: 32. Syn. nov.
Amauronematus obscurus Lindqvist, 1962b: 11–12. Secondary homonym of Nematus obscurus Norton, 1861 [Euura obscura (Norton, 1861)]. Syn. nov.
Amauronematus pustulatus Lindqvist, 1962b: 12–13. Syn. nov.
Euura tranquilla Vårdal & Prous, 2014 in Prous et al. 2014: 52. Replacement name for Amauronematus pacificus Malaise, 1931.
Diagnosis
Females (4.5–6.5 mm) with mostly or completely black abdomen (and thorax) can be distinguished from the other species in the vittata group. Paler females are most similar to those of E. hulteni, E. hedstroemi, E. minivittata sp. nov., and might not always be distinguishable. Euura hulteni typically have dorsally and ventrally black-lined metafemur (similar in E. minivittata), while the metafemur is basally black in E. tillbergi. Euura minivittata has a darker pterostigma and metafemur than in pale specimens of E. tillbergi. The pterostigma of Euura hedstroemi is typically posteriorly dark-lined and the metatibia with a dark spot at basal third of tibia, but pterostigma and metatibia can be (almost) uniformly pale, making separation from paler specimens of E. tillbergi unreliable. Male penis valves are most similar to E. krausi and paler specimens might not be distinguishable from this species. In E. tillbergi valvula 3 is rarely triangular, without a posterior invagination (ZMUO.031718). Male 4.0–6.0 mm.
Type material examined
Lectotype Amauronematus tillbergi, here designated
SWEDEN – Torne Lappmark • ♀; Torneträsk; 68.22° N, 19.74° E; 400 m a.s.l.; R. Malaise leg.; NHRS, NHRS-HEVA000003942.
Lectotype Amauronematus tillbergi var. foveifrons, here designated
SWEDEN – Torne Lappmark • ♀; Torneträsk; 68.22° N, 19.74° E; 400 m a.s.l.; R. Malaise leg.; NHRS, NHRS-HEVA000003943.
Notes
Best matches: DEI-GISHym84434 (colouration), DEI-GISHym84433 (size), DEI-GISHym83702 (lancet).
Holotype Amauronematus latisulcatus
RUSSIA – Kamchatka oblast • ♀; Klutchi [Klyuchi]; 56.32° N, 160.85° E; R. Malaise leg.; NHRS, NHRS-HEVA000006415.
Lectotype Amauronematus pacificus, here designated
RUSSIA – Kamchatka oblast • ♀; Petropavlovsk; 55.06° N, 158.65° E; R. Malaise leg.; NHRS, NHRS-HEVA000006416.
Holotype Amauronematus mcluckieae
UNITED KINGDOM – Scotland • Cairngorm Mts, Cairngorm; 57.09° N, 3.69° W; above 910 m a.s.l.; 27 Jun. 1934; R.B. and J.E. Benson leg.; BMNH, B.M.TYPEHYM.1.642.
Holotype Amauronematus rex
UNITED KINGDOM – England • ♀; Buckinghamshire, Whaddon Chase; 51.83° N, 0.82° W; Mar. 1946; R.B. Benson leg.; reared ex larva on Salix; BMNH, B.M.TYPEHYM.1.685.
Notes
Best morphological match: DEI-GISHym83872. Was previously synonymized with hedstroemi Malaise, but colour characters of the rex holotype fit better with specimens of E. tillbergi from the Russian Far East (DEI-GISHym83872, sequenced). Mesoscutellum is not completely pale in any E. hedstroemi specimens studied. In addition, the type specimens of rex Benson were reared from Salix aurita and possibly from S. atrocinerea (mixed rearing), but E. hedstroemi seems to be restricted to S. phylicifolia.
Holotype Amauronematus obscurus
FINLAND – Uusimaa • ♀; Helsinge [Vantaa]; 60.30° N, 24.90° E; 25 May 1961; E. Lindqvist leg.; MZH, http://id.luomus.fi/GL.2750.
Holotype Amauronematus pustulatus
FINLAND – Kuusamo • ♀; Kitka; 66.24° N, 28.98° E; 5 Jul. 1958; M. Viitasaari leg.; MZH, http://id.luomus.fi/GL.2536.
Host plants
Salix phylicifolia, S. myrsinites, S. herbacea, and possibly S. aurita and S. atrocinerea Brot. if Amauronematus rex Benson really is a synonym of E. tillbergi.
Genetics
COI
Based on 35 specimens, maximum within-species distance is 3.28% and the nearest neighbour, diverging by a minimum of 0%, is Euura krausi.
Nuclear
Based on 31 specimens, maximum within-species distance is 1.7% (1.08% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.12%, is Euura krausi.
Distribution and material examined
Palaearctic. Specimens studied are from 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 pages 189-191, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574