Euura moerens
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 moerens

description: 144 Euura moerens (Förster, 1854)
Figs 144, 381
Nematus moerens Förster, 1854a: 294–295. Lectotype designated below.
Nematus pygostolus Förster, 1854b: 431–432. Lectotype designated by Weiffenbach (1962). Synonymy by Weiffenbach (1962).
Nematus pleuralis Thomson, 1863: 628. Lectotype designated below. Synonymy by Enslin (1916a).
Pachynematus pullus Konow, 1903a: 379 (key). Lectotype designated below. Synonymy by Lindqvist (1976).
Pachynematus falonus Ross, 1945: 108 (key). Holotype ♂ (INHS), not examined. Type locality: Canada, Alberta, Edmonton.
Pachynematus torridonensis Liston, 1980b: 52–53. Synonymy by Liston (1995).
Diagnosis
Females are most similar to E. lichtwardti. Metatarsomere 1 and metafemur are usually extensively pale in E. moerens, but usually completely or nearly completely black E. lichtwardti. In males, the apical projection of tergum 8 is absent or indistinct unlike most other Euura (thus more like most Pristiphora). Penis valves reliably separate E. moerens from the other species.
Type material examined
Lectotype Nematus moerens, here designated
GERMANY – Nordrhein-Westfalen • ♀; Aachen area; 50.77° N, 6.09° E; ZSM, DEI-GISHym88919.
Notes
According to Taeger & Blank (1998) the lectotype was designated by Haris (1997), but no such designation was made.
Lectotype Nematus pygostolus
GERMANY – Nordrhein-Westfalen • ♂; Aachen area; 50.77° N, 6.09° E; ZSM, DEI-GISHym12488.
Lectotype Nematus pleuralis, here designated
SWEDEN • ♀; Stockholm; 59.31° N, 18.04° E; C.H. Boheman leg.; NHRS, NHRS-HEVA000006326.
Lectotype Pachynematus pullus, here designated
FRANCE – Champagne-Ardenne • ♀; Charleville-Mézières; 49.76° N, 4.72° E; 11 May 1895; SDEI, GBIF-GISHym3882.
Holotype Pachynematus torridonensis
UNITED KINGDOM – Scotland • Wester Ross, Coire MhicNobuil, near Allt Toll a’Mhaidaich; 57.57° N, 5.56° W; 150 m a.s.l.; 16 May 1978; A.D. Liston leg.; RSME.
Host plants
Calamagrostis arundinacea (L.) Roth (Kangas 1985), Poa sp. and Festuca sp. (Macek et al. 2020).
Genetics
COI
Based on 8 specimens, maximum within-species distance is 6.75% and the nearest neighbour, diverging by a minimum of 0.97%, is Euura clitellata.
Nuclear
Based on 7 specimens, maximum within-species distance is 0.23% (0.35% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 1.38%, is Euura fallax.
Distribution and material examined
Holarctic. Specimens studied are from Finland, France, Germany, Norway, Sweden, 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 94-95, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574