Euura viduatoides (Lindqvist, 1960)

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 : 219-221

292 Euura viduatoides (Lindqvist, 1960)

Figs 305 , 525

Amauronematus viduatoides Lindqvist, 1960a: 127–129 .

Amauronematus branderi Lindqvist, 1969: 231–232 . Syn. nov.

Diagnosis

The distinctly pale clypeus, pronotum and tegula, smooth mesepisternum, and slightly curved lancet with 14–16 annuli usually enable identification of the females, but separation from E. leucolena (mesepisternum usually slightly matt) might not always be reliable. Two putative males without sequence data (a paratype of viduatoides [http://id.luomus.fi/GL.9214] and ZMUO.032626) have distinctly pale tegula and pronotum (black in most other species, except E. viduata in part) and a similar penis valve to E. leucolena , except that the valviceps is broader.

Female

5.0–6.0 mm. Head black to slightly pale around eyes; labrum pale; clypeus pale; supraclypeal area black; antenna black; thorax black; pronotum extensively pale; tegula extensively pale; pterostigma pale or centrally paler than externally; metafemur mostly black to pale; metatibia pale or brown; hind tarsus black; abdomen mostly black to extensively pale apically; at least hypopygium, valvifer 2 and tergum 9 slightly pale; valvula 3 slightly pale basally; cerci pale; mesepisternum smooth; valvula 3 of medium length, in dorsal view gradually narrowing, with an acute tip.

Male

4.5–5.0 mm (n = 2). Association with female not confirmed. Head black or slightly brown around eyes; labrum pale; clypeus pale; malar space black or slightly pale; supraclypeal area black or slightly pale; antenna black; thorax black; pronotum slightly to extensively pale; tegula slightly to extensively pale; pterostigma brown or centrally paler than externally; metafemur extensively pale; metatibia pale; hind tarsus black; abdomen black; sternum 9 pale; mesepisternum smooth; projection of tergum 8 small.

Type material examined

Holotype Amauronematus viduatoides

FINLAND – Uusimaa • ♀; Helsinki, Lövö ; 60.18° N, 24.85° E; 9 Apr. 1952; E. Lindqvist leg.; MZH, http://id.luomus.fi/GL.9213.

Holotype Amauronematus branderi

FINLAND – Häme • ♀; Urjala; 61.08° N, 23.56° E; 7 Jun. 1965; T. Brander leg.; MZH, http://id.luomus. fi/GL.9208.

Notes

The COI sequence (281 bp) of the holotype female of branderi is identical to ZMUO.040884, ZMUO.038738, ZMUO.043842, ZMUO.038736, ZMUO.038737, and ZMUO.038735.

Host plants

Salix pentandra . Kangas (1985) recorded Salix phylicifolia and Macek et al. (2020) S. aurita , but it is not certain that the sawfly species was correctly identified.

Genetics

COI

Only one sequence available. The nearest neighbour, diverging by a minimum of 0%, is Euura rectiserra .

Nuclear

Only one sequence available, a female with haplotypes diverging by 0.09%. The nearest neighbour, diverging by a minimum of 0.45%, is Euura leucolena (ZMUO.037242).

Distribution and material examined

Palaearctic. Specimens studied are from Finland.

Species not assigned to groups

Figures

Figs 304–308. Lancets of Euura Newman, 1837. 304. rectiserra (Lindqvist, 1971), holotype, ♀ http://id.luomus.fi/GL.9211. 305. viduatoides (Lindqvist, 1960) ZMUO.038737. 306. viduata (Zetterstedt, 1838) PR.254VV. 307. anthracina (Lindqvist, 1959) ZMUO.041203. 308. distinguenda (Enslin, 1915) DEI-GISHym20792.

Figs 520–533. Penis valves of Euura Newman, 1837. 520. cornuta (Lindqvist, 1962), Amauronematus cornutus Lindqvist, 1962, holotype http://id.luomus.fi/GL.2466. 521. nitidipleuris (Malaise, 1931) http://id.luomus.fi/GP.110187. 522. viduata (Zetterstedt, 1838) DEI-GISHym12011. 523. viduata DEI-GISHym12511. 524. viduata group sp. DEI-GISHym31865. 525. viduatoides? (Lindqvist, 1960) ZMUO.032626. 526. erecta (Lindqvist, 1945) DEI-GISHym12074. 527. erecta DEI-GISHym12062. 528. leucolena (Brischke, 1883) ZMUO.038728. 529. leucolena ZMUO.060514. 530. malaisei (Hellén, 1970) ZMUO.033815. 531. rectiserra (Lindqvist, 1971) ZMUO.043842. 532. anthracina (Lindqvist, 1959) 1e. 533. distinguenda (Enslin, 1915) PR.620VV.