Euura betulae

217 Euura betulae (Schmidt, 1997) Fig. 235 Amauronematus betulae Schmidt, 1997: 279–280. Holotype ♀ (http://id.luomus.fi/GL.2501, MZH). Type locality: Finland, Juuma [735:60]. Diagnosis The holotype is externally very similar to E. septentrionalis, but the lamnium is 1.5–1.6 times as long as the radix (holotype; DEI-GISHym80673) compared to 1.8–1.9 (based on Schmidt 1997) or 2.0–2.2 (taiganus holotype, ZMUO.037302) in E. septentrionalis. We have associated only one other specimen (DEI-GISHym80673 from Primorsky Krai, Russia) with the holotype, based on the lancet and similar colouration. No males have been associated with the female. Type material examined Holotype Amauronematus betulae FINLAND – Kuusamo • ♀; Juuma; 66.27° N, 29.38° E; 16 Jun. 1985; M. Ahola leg.; MZH, http://id.luomus.fi/GL.2501. Host plants Since the holotype (collected on 16 Jun. 1985 by M. Ahola) is not a reared specimen, the host is not known for certain. Schmidt (1997: 280) mentioned that in his oviposition experiments a female or females (number of specimens not given) laid eggs on Betula nana and B. pubescens, but rejected willows. We have not examined any such specimens. Genetics COI Only one sequence available. The nearest neighbours, diverging by a minimum of 0%, are Euura amicula, E. histrio, E. nuorbinjargi, E. rufa, E. septentrionalis, E. striata, and E. tenuis. Nuclear Only one sequence available, a female with haplotypes diverging by 0.7%. The nearest neighbour, diverging by a minimum of 0.07%, is Euura histrio. Distribution and material examined Palaearctic. Specimens studied are from Finland, and Russia.