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.