West Palaearctic species of Euura Newman, 1837 (Hymenoptera, Tenthredinidae) Author Prous, Marko 5E0EFC23-7C71-42E6-A031-BB9B09AD6C30 Museum of Natural History, University of Tartu, Vanemuise 46, 51003 Tartu, Estonia. & Ecology and Genetics Research Unit, PO. Box 3000, FI- 90014 University of Oulu, Finland. mprous@ut.ee Author Liston, Andrew 55C10B5B-D218-43CB-9B58-7E972FEB096E Senckenberg Deutsches Entomologisches Institut, Eberswalder Strasse 90, 15374 Müncheberg, Germany. andrew.liston@senckenberg.de Author Monckton, Spencer K. 3B1E7139-C82E-40F9-8FB3-93CFDA318EAD Centre for Biodiversity Genomics, University of Guelph, 50 Stone Road East, N 1 G 2 W 1, Guelph, ON, Canada. s.monckton@gmail.com Author Kramp, Katja 72579D81-D3A8-4803-91AC-4C928C83EBEB Leibniz Centre for Agricultural Landscape Research, Eberswalder Str. 84, 15374 Müncheberg, Germany. katja.kramp@zalf.de Author Vårdal, Hege C87892C8-EE6B-4520-8402-85FD0E297455 Swedish Museum of Natural History, Box 50007, SE- 10405 Stockholm, Sweden. hege.vardal@nrm.se Author Vikberg, Veli 7B5E2CCB-CD39-4744-A695-05EF3076373C Liinalammintie 11 as. 6, FI- 14200 Turenki, Finland. veli.vikberg@pp.inet.fi Author Heibo, Erik C1D82863-A4E6-497B-8329-ED326387B80D Rypeveien 34 A, 3420 Lierskogen, Norway. eheibo@yahoo.no Author Mutanen, Marko 627B15F5-FFE5-40DE-9A78-FF2FD900A7B1 Ecology and Genetics Research Unit, PO. Box 3000, FI- 90014 University of Oulu, Finland. & Marko. Marko.Mutanen@oulu.fi text European Journal of Taxonomy 2025 2025-02-27 977 1 377 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2799/12795 journal article 308603 10.5852/ejt.2025.977.2799 9b348823-385e-4e75-81fe-14b440580125 2118-9773 15019574 73DA044B-EB3D-4BF1-97EA-7430036DEEE0 Nematus einersbergensis Hartig, 1840: 26 . Lectotype designated by Taeger & Blank (1998) . Syn. nov. Nematus schmidtii Gimmerthal, 1844: 37 . Syntypes ♀♀ (deposition unknown). Type locality: Latvia , vicinity of Riga . Synonymy with xanthocarpus by Taeger & Blank (1998) . Nematus eversmanni Förster, 1854b: 423–424 . Lectotype designated by Haris (1997) . Synonymy with xanthocarpus by Taeger & Blank (1998) . Nematus emarginatus Förster, 1854b: 424–425 . Lectotype designated by Haris (1997) . Synonymy with xanthocarpus by Taeger & Blank (1998) . Nematus circumscriptus Förster, 1854a: 301–302 . Lectotype designated by Haris (1997) . Synonymy with xanthocarpus by Konow (1904c) . Nematus erythropareus Zaddach, 1884 in Brischke 1884: 130 . Holotype ♀ , not located. Type locality: Austria , Tirol , Innsbruck. Synonymy with xanthocarpus by Taeger & Blank (1998) . Pachynematus sulcatus Benson, 1948a: 60–65 . Synonymy with xanthocarpus by Haris (1997) . Pachynematus chambersi Benson, 1948a: 60–65 . Synonymy with xanthocarpus by Haris (1997) . Pachynematus calcicola Benson, 1948a: 60–65 . Synonymy with xanthocarpus by Taeger & Blank (1998) . Pachynematus angustatus Lindqvist, 1949: 85 . Syn. nov. Pachynematus virginalis Liston, 1980a: 241–242 . Synonymy by Liston et al . (2006) . Diagnosis Based on nuclear data, there are two main lineages that tend to look somewhat different. Specimens in one lineage (similar to Nematus einersbergensis Hartig ) tend to be smaller and the head is not expanded behind the eyes, unlike in the more typical E. fallax that falls in the second main clade. However, specimens exist which form additional nuclear lineages that look more like einersbergensis (e.g., ZMUO.032994) or more like fallax (DEI-GISHym16246). These nuclear lineages are more closely related to each other than some of the lineages in clitellata (which very likely contains more than one species) and could perhaps still belong to single species. Females are very similar to those of E. clitellata , see under that species. Type material examined Lectotype Nematus fallax [designated by Lacourt (2000) , photos examined] FRANCE – Ile-de-France • ♀ ; Paris ; 48.9° N , 2.3° E ; MRSN , EY34235 . Lectotype Nematus melanocerus GERMANY • ♂ ; northern Germany [according to Hartig 1840: 22 ]; ZSM , DEI-GISHym12497. Lectotype Nematus eupodius GERMANY • ♂ ; northern Germany [according to Hartig 1840: 22 ]; ZSM , DEI-GISHym12495. Lectotype Nematus einersbergensis GERMANY – Niedersachsen • ♀ ; Einersberg ; 51.81° N , 10.30° E ; ZSM , DEI-GISHym84488. Notes Best morphological match: ZMUO .032994, ZMUO .029665, DEI-GISHym12609. Lectotype Nematus eversmanni RUSSIA – Tatarstan • ♂ ; Kasan Province ; 55.8° N , 49.1° E ; E. Eversmann leg.; ZIN , DEI-GISHym12486. Notes The penis valve fits with DEI-GISHym84275. Lectotype Nematus emarginatus GERMANY – Rheinland-Pfalz • ♂ ; Boppard ; 50.22° N , 7.57° E ; ZSM , DEI-GISHym12496. Lectotype Nematus circumscriptus GERMANY – Nordrhein-Westfalen • ♀ ; Aachen area ; 50.77° N , 6.09° E ; ZSM , DEI-GISHym12489. Holotype Pachynematus sulcatus UNITED KINGDOM – Scotland • ♂ ; Perthshire , Killin ; 56.47° N , 4.32° W ; 120 m a.s.l. ; 31 May–14 Jun. 1932 ; R.B. Benson leg.; BMNH , B.M. TYPEHYM.1.700. Holotype Pachynematus chambersi UNITED KINGDOM – England • ♂ ; Bedfordshire , Ampthill ; 52.03° N , 0.49° W ; 100 m a.s.l. ; 17 May 1947 ; V.H. Chambers leg.; BMNH , B.M. TYPEHYM.1.699. Notes Best morphological match: DEI-GISHym84450. Holotype Pachynematus calcicola UNITED KINGDOM – England • ♂ ; Yorkshire , Pen-y-Ghent ; 54.16° N , 2.25° W ; F.W. Edwards and W.H.T. Tams leg.; May 1933 ; BMNH , B.M. TYPEHYM.1.698. Holotype Pachynematus angustatus FINLAND – Inari Lapland • ♀ ; Utsjoki , Outakoski ; 69.61° N , 25.98° E ; 22 Jun. 1947 ; E. Lindqvist leg.; MZH , http://id.luomus.fi/GL.3427. Holotype Pachynematus virginalis UNITED KINGDOM – Scotland • ♂ ; Edinburgh , Duddingston Loch ; 55.94° N , 3.15° W ; 2 Jun. 1979 ; A. Liston leg.; RSME . Host plants Various genera of Poaceae have been recorded as host plants, as well as unspecified species of Juncus and Carex , but it is currently impossible to decide whether these records refer to E. fallax , or the unresolved complex of species around E. clitellata . Genetics COI Based on 38 specimens , maximum within-species distance is 6.08% and the nearest neighbour, diverging by a minimum of 6.08%, is Euura clitellata . Nuclear Based on 24 specimens , maximum within-species distance is 1.08% (0.71% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 1.38%, is Euura moerens . Distribution and material examined Palaearctic. Specimens studied are from Finland , France , Germany , Portugal , Russia , Sweden , and the United Kingdom .