Euura pallescens ( Hartig, 1837 )

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 : 139-140

196 Euura pallescens ( Hartig, 1837)

Figs 211 , 442

Nematus pallescens Hartig, 1837: 216 . Lectotype designated below.

Nematus olivaceus Thomson, 1871: 120–121 . Lectotype designated below. Synonymy by Konow (1890).

Nematus ruficeps Zaddach, 1883 in Brischke 1883: 131. Holotype ♀, probably destroyed ( Blank & Taeger 1998). Type locality: Denmark, Sonderburg. Synonymy by Konow (1890).

Nematus pachycerus Borries, 1896: 232–233 . Syntypes ♀ ♂, not located, possibly destroyed. Type locality: Denmark, Dyrehaven. Synonymy by Blank et al. (2009).

Diagnosis

Females are typically nearly completely pale, males dorsally extensively black. Pale mesepisternum, mesepimeron, hind tibia and femur should enable separation of the species from the others in the group. The distinctly apically inclined basalmost suture of the lancet also distinguishes the females from the other two species (basalmost suture more or less straight). Penis valves are most similar to E. styx . Ventroapical lobe of paravalva is more or less symmetrical in E. pallescens , but asymmetrical (dorsally straight and ventrally convex) in E. styx .

Type material examined

Lectotype Nematus pallescens , here designated

GERMANY – Niedersachsen • ♀; Harz; 51.8° N, 10.3° E; W. Saxesen leg.; ZSM, GBIF-GISHym3373 .

Lectotype Nematus olivaceus , here designated

SWEDEN – Skåne • ♀; Wittsjö [Vittsjö]; 56.35° N, 13.66° E;in coniferous forest; MZLU, MZLU2017280 .

Host plants

Picea abies . One generation per year.

Genetics

COI

Based on 5 specimens, maximum within-species distance is 1.37% and the nearest neighbour, diverging by a minimum of 0%, is Euura montana .

Nuclear

Based on 5 specimens, maximum within-species distance is 0.36% (0.12% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.6%, is Euura pallescens group specimen DEI-GISHym80693 (looks like E. montana , lancet Fig. 213 ) from Primorsky Krai, Russia.

Distribution and material examined

Palaearctic. Specimens studied are from Finland, Germany, and Sweden.

Figures

Figs 210–212. Lancets of Euura Newman, 1837. 210. montana (Zaddach, 1883) DEI-GISHym84263. 211. pallescens (Hartig, 1837) DEI-GISHym12526. 212. styx (Benson, 1958), holotype, ♀ B.M.TYPEHYM.1.791.

Figs 436–449. Penis valves of Euura Newman, 1837. 436. semiopaca (Lindqvist, 1958) DEI- GISHym88881. 437. semiopaca? PR.566VV. 438. tibialis (Newman, 1837) DEI-GISHym12515. 439. frenalis (Thomson, 1888) DEI-GISHym12057.440. oligospila (Förster, 1854) DEI-GISHym21395. 441. montana (Zaddach, 1883) DEI-GISHym84264.442. pallescens (Hartig, 1837) DEI-GISHym12148. 443. styx (Benson, 1958) http://id.luomus.fi/NG.1551. 444. styx paratype. 445. papillosa (Retzius, 1783) ZMUO.040796. 446. pavida (Serville, 1823) DEI-GISHym83970. 447. pavida ZMUO.030817. 448. amentorum (Förster, 1854) http://id.luomus.fi/GP.110189. 449. dahlbomi (Thomson, 1871) http://id.luomus.fi/GP.110190.

Figs 213–215. Lancets of Euura Newman, 1837. 213. pallescens group sp. DEI-GISHym80693. 214. gracilidentata (Viitasaari, 1980) DEI-GISHym12504. 215. leucotrocha (Hartig, 1837) DEI- GISHym17610.