Euura nigriventris ( Holmgren, 1883 )

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 : 224-225

298 Euura nigriventris ( Holmgren, 1883)

Fig. 312

Nematus nigriventris Holmgren, 1883: 146 , pl. 2 fig. 10. Lectotype designated below.

Amauronematus varianus MacGillivray, 1919: 16 . Lectotype designated below. Synonymy by Smith (1979).

Pteronidea melanostoma Rohwer, 1920: 212–213 . Holotype ♀ (USNMENT00779223, USNM, http:// n 2t.net/ark:/65665/3cc28254b-6cc4-4fd9-bb98-5784f9f4262b), not examined. Type locality: USA, West Aleutians, Saint George Island. Synonymy by Smith (1979). Looks more like E. stordalensis or E. opacipleuris (5 mm).

Diagnosis

We have studied only two specimens (lectotype females of N. nigriventris and A. varianus ). Colouration (nearly completely black), size (6.5 mm), and lancet (short setae,?16–17 serrulae, serrulae with distinct cypsellae, long, weakly protruding, and with long basal extension) distinguish the species from the other Euura . Externally perhaps most easily confused with members of the E. viduata group.

Female

6.5 mm ( Lindqvist 1959a; MacGillivray 1919). Head black; antenna, labrum and clypeus black; thorax black, pronotum and tegula black; pterostigma brown; abdomen nearly completely black, valvifer 2 brown, valvula 3 black; metafemur black; tibiae and tarsi brown; antenna not reaching pterostigma; claws bifid; valvula 3 elongate, gradually tapering in dorsal view, and acute at apex; lancet with?16–17 serrulae.

Type material examined

Lectotype Nematus nigriventris , here designated

RUSSIA – Novaja Zemlya • ♀; Matotschkin Scharr [Matochkin Strait]; 73.3° N, 55.6° E; 1875; NHRS, NHRS-HEVA000006477 .

Lectotype Amauronematus varianus , here designated

USA – Alaska • ♀; Camden Bay, West of Konganevik ; 70.02° N, 145.36° W; 27 Jun. 1914; F. Johansen leg.; CNC, CNC1057058 .

Host plants

Unknown.

Genetics

COI

No data.

Nuclear No data.

Distribution and material examined

Holarctic. Specimens studied are from Russia and the USA.

Figures

Figs 309–312. Lancets of Euura Newman, 1837. 309. hyperborea (Thomson, 1871) ZMUO.041209. 310. salicis (Linnaeus, 1758) DEI-GISHym12532.311. imperfecta (Zaddach, 1876) DEI-GISHym11467. 312. nigriventris (Holmgren, 1883), lectotype, ♀ NHRS-HEVA000006477.