Euura hypoxantha (Förster, 1854)

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), European Journal of Taxonomy 977, pp. 1-377 : 132

185 Euura hypoxantha (Förster, 1854)

Figs 206, 430

Nematus hypoxanthus Förster, 1854a: 313–314 . Lectotype designated below.

Nematus palliatus Thomson, 1863: 635 . Lectotype designated below. Synonymy by Konow (1904e).

Nematus orbitalis Cameron, 1884: 265–266 . Syntypes ♀ ♂ (BMNH?), not examined. Type localities: United Kingdom, Scotland; Cadder Wilderness and Ballantrae, and Germany. Synonymy by Konow (1904e).

Pteronidea nigronota Lindqvist, 1958: 102 . Holotype ♀ (MZH?), not examined. Type locality: Finland, Munksnäs. Synonymy by Lindqvist (1959a).

Diagnosis

Females are most similar to E. jugicola . Mesepisternum is (usually?) extensively pale and black colour on abdominal terga decreases gradually from base to apex in E. hypoxantha , while mesepisternum is (usually?) black, and black colour on terga decreases abruptly from base to apex in E. jugicola . Also, the abdomen can be green in living E. hypoxantha females, but pink in E. jugicola . Details of the lancet (setae long and hair-like, all visible sutures in dorsal part inclined basally) and colouration (pale and round pterostigma, pale mesepisternum) should distinguish the species from the other Euura which have a lancet with the radix longer or about as long as lamnium. Males are extensively pale and have distinctive penis valves, with a large valvispina and a distinct hump dorsobasally.

Type material examined

Lectotype Nematus hypoxanthus , here designated

GERMANY – Nordrhein-Westfalen • ♂; Aachen area ; 50.77° N, 6.09° E; ZSM, DEI-GISHym3301 .

Lectotype Nematus palliatus , here designated

SWEDEN – Skåne • ♀; Lund ; 55.71° N, 13.19° E; MZLU, MZLU2017322 .

Host plants

Many different Salix spp. (Taeger et al. 1998), less frequently Populus spp. ( Chambers 1952).

Genetics

COI

Based on 7 specimens, maximum within-species distance is 2.43% and the nearest neighbour, diverging by a minimum of 4.26%, is Euura poppii .

Nuclear

Based on 6 specimens, maximum within-species distance is 0.53% (0.19% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 1%, is Euura jugicola .

Distribution and material examined

Palaearctic. Specimens studied are from Austria, Belgium, Estonia, Finland, Germany, Norway, Russia, and Sweden.