Euura bipartita
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 bipartita

description: 106 Euura bipartita (Serville, 1823)
Figs 98–100, 341–343
Nematus bipartitus Serville, 1823: 71. Lectotype ♂ (MRSN), designated by Blank & Taeger (1998), not examined. Type locality: France, Paris.
Nematus aurantiacus Hartig, 1837: 197–198. Lectotype designated below. Synonymy by Konow (1901b).
Nematus confusus Förster, 1854a: 280–282. Lectotype designated below. Synonymy by Konow (1902b).
Nematus xanthogaster Förster, 1854a: 315–316. Lectotype designated below. Synonymy by Konow (1902b).
Nematus ochropus Thomson, 1863: 617. Synonymy by Konow (1901b).
Pachynematus albipennis var. salicicola Enslin, 1916a: 464. Lectotype designated by Blank et al. (2009). Synonymy by Blank et al. (2009).
Pteronidea fulviventris Lindqvist, 1958: 107. Syn. nov.
Pteronidea stramineipes Lindqvist, 1958: 111. Syn. nov.
Pteronidea rutilipes Lindqvist, 1959c: 59–60. Syn. nov.
Diagnosis
In southern Fennoscandia and central Europe, E. bipartita is extensively pale (completely or nearly completely pale abdomen and often also extensively pale thorax), but based on nuclear sequencing, specimens are (usually?) much darker (thorax black and abdomen from extensively pale ventrally to nearly completely black) in northern Fennoscandia. The holotypes of stramineipes and rutilipes fit well (externally and saws) with the dark form of E. bipartita. Specimens with intermediate colouration might not always be distinguishable from E. monticola.
Head black or pale around eyes; labrum pale; clypeus black or pale; supraclypeal area black or pale; flagellum black or pale; thorax black or with pale markings laterally and dorsally; tegula and pronotum posteriorly pale; pterostigma pale; metafemur and metatibia pale; hind tarsus pale or brown; abdomen nearly completely black to completely pale; claws bifid in female, bifid or with small to large subapical tooth in male; valvula 3 elongate, gradually tapering; lancet with (14?)15–17(18?) serrulae.
The most similar species are E. monticola and E. perkioemaekii. Male and female specimens of E. bipartita with a completely or nearly completely pale abdomen (usually?) also have at least a partly pale mesepisternum and partly pale antennae, while E. monticola usually has a black mesepisternum, black antennae and extensively black abdominal terga 1–2. The antennae of E. monticola (as long as costa or up to half of pterostigma in female) may also be shorter than in E. bipartita (usually longer than costa and half of pterostigma in female and male). Females of E. bipartita differ from E. perkioemaekii by having a longer subapical tooth of claw and possibly more prominent serrulae. Darker males of E. bipartita may not be always separable from E. perkioemaekii. Pale specimens of E. bipartita are also similar to E. albipennis (character states in parentheses), from which it usually differs by having bifid claws (usually with small subapical tooth), mesoscutellum at same level as lateral mesoscutal lobes (usually higher than lateral mesoscutal lobes), protibial spur with velum (without velum), ventrally at least slightly pale antenna (usually uniformly black), extensively pale head and mesepisternum (usually mostly black), and slightly more protruding serrulae.
Type material examined
Lectotype Nematus aurantiacus, here designated
GERMANY • ♀; ZSM, GBIF-GISHym3087.
Paralectotype Nematus aurantiacus
GERMANY • 1 ♀; ZSM, GBIF-GISHym3206.
Lectotype Nematus confusus, here designated
GERMANY – Nordrhein-Westfalen • ♀; Aachen area; 50.77° N, 6.09° E; A. Förster leg.; ZSM, GBIFGISHym3229.
Lectotype Nematus xanthogaster, here designated
GERMANY – Nordrhein-Westfalen • ♂; Aachen area; 50.77° N, 6.09° E; A. Förster leg.; ZSM, GBIFGISHym3459.
Holotype Nematus ochropus
SWEDEN • ♀; Dalarna; NHRS, NHRS-HEVA000003994.
Lectotype Pachynematus albipennis var. salicicola
GERMANY – Brandenburg • ♀; Fürstenwalde; 52.37° N, 14.06° E; 1–31 May 1912; S. Soldanski leg.; SDEI, DEI-GISHym5034.
Holotype Pteronidea fulviventris
FINLAND – Kainuu • ♀; Suomussalmi, Ruhtinansalmi; 65.15° N, 29.35° E; 21 Jul. 1917; O. Sorsakoski leg.; ZMUT, http://mus.utu.fi/ZMUT.TYPE765.
Note
14 serrulae. Lancet most similar to the holotype of Pteronidea stramineipes, but with fewer serrulae (16 in stramineipes). Antennae seem to be of the same length as in E. monticola, but mesepisternum and antennae are partly pale, and the lancet has distinctly fewer serrulae than E. monticola. Mesepisternum slightly matt.
Holotype Pteronidea stramineipes
FINLAND – Lapin Lääni • ♀; Kilpisjärvi; 69.04° N, 20.81° E; 7 Jul. 1953; E. Lindqvist leg.; MZH, http://id.luomus.fi/GL.3511.
Note
The best morphological match is ZMUO.041906.
Holotype Pteronidea rutilipes
FINLAND – Lapin Lääni • ♀; Kilpisjärvi; 69.04° N, 20.81° E; 12 Jul. 1950; E. Lindqvist leg.; MZH, http://id.luomus.fi/GL.3590.
Note
The best morphological match is ZMUO.041906.
Hosts plants
Salix spp.; according to Enslin (1911b) also Populus.
Genetics
COI
Based on 10 specimens, maximum within-species distance is 3.5% and the nearest neighbour, diverging by a minimum of 0%, is Euura monticola.
Nuclear
Based on 10 specimens, maximum within-species distance is 0.87% (0.61% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.21%, is Euura perkioemaekii.
Distribution and material examined
Palaearctic. Specimens studied are from Belgium, Bulgaria, Czech Republic, Estonia, Finland, France, Germany, 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 49-51, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574