Euura caeruleocarpus
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 caeruleocarpus

description: 137 Euura caeruleocarpus (Hartig, 1837)
Figs 135, 371
Nematus propinquus Dahlbom, 1835a: 25. Nomen oblitum (Blank et al. 2009). Described based on larvae. Type material not located. Type locality: Sweden, Skåne, Lilla Raby near Lund. Synonymy with brachyacanthus by Thomson (1871).
Nematus caeruleocarpus Hartig, 1837: 187. Nomen protectum (Blank et al. 2009).
Nematus sulcipes Hartig, 1837: 186–187. Lectotype designated below. Synonymy by Kriechbaumer (1885).
Nematus brevispinis Förster, 1854a: 338–339. Lectotype designated below. Synonymy by Kriechbaumer (1885).
Nematus brachyacanthus Thomson, 1863: 629. Lectotype designated below. Synonymy by Cameron (1885).
Nematus insubricus Cobelli, 1892: 70–71. Holotype ♀ (ROV), not examined. Type locality: Italy, Milano area. Synonymy by Dalla Torre (1894).
Diagnosis
The most similar species is E. vicina, which is best distinguished by its inner hind tibial spur being longer than the apical breadth of hind tibia (shorter in E. caeruleocarpus). Occasionally, northern specimens of E. caeruleocarpus have a bicoloured pterostigma (basally or externally black and apically or internally brown or yellowish). Genetically, E. villosa is very close to E. caeruleocarpus, but morphologically these species can be distinguished well:
– head and thorax with long hair; hind tibia completely and hind tarsus mainly yellow; pterostigma yellow .................................................................................................................................. E. villosa
– head and thorax with short hair; hind tibia black at tip and hind tarsus completely black; pterostigma black, rarely bicoloured ........................................................................................ E. caeruleocarpus.
Female: 8.0– 10.5 mm. Male: 7.5–8.5 mm.
Type material examined
Holotype Nematus caeruleocarpus
GERMANY – Niedersachsen • ♀; Harz; 51.8° N, 10.3° E; W. Saxesen leg.; ZSM, GBIF-GISHym3212.
Lectotype Nematus sulcipes, here designated GERMANY • ♀; ZSM, GBIF-GISHym3446.
Lectotype Nematus brevispinis, here designated
GERMANY – Nordrhein-Westfalen • ♂; Aachen area; 50.77° N, 6.09° E; ZSM, GBIF-GISHym 3210.
Lectotype Nematus brachyacanthus, here designated
SWEDEN • ♀; Skåne; MZLU, MZLU2017284.
Host plants
The main hosts are Salix spp., particularly S. fragilis L., S. purpurea L., S. triandra L. and S. viminalis L. (Miles 1936). Less frequently used are Populus spp. (e.g., Chambers 1947). Unconfirmed are Paeonia officinalis L., Delphinium sp. and Aquilegia sp. (Benson 1958a).
Genetics
COI
Based on 8 specimens, maximum within-species distance is 1.22% and the nearest neighbour, diverging by a minimum of 0.61%, is Euura villosa.
Nuclear
Based on 3 specimens, maximum within-species distance is 0.33% (0.33% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.5%, is Euura villosa.
Distribution and material examined
Palaearctic. Specimens studied are from Austria, Bulgaria, Finland, Germany, 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 83-84, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574