Euura glutinosae (Cameron, 1882)

Prous, Marko, Liston, Andrew & Mutanen, Marko, 2021, Revision of the West Palaearctic Euura bergmanni and oligospila groups (Hymenoptera, Tenthredinidae), Journal of Hymenoptera Research 84, pp. 187-269 : 187

Euura glutinosae (Cameron, 1882)

Figs 8C , 11H , 16 , 24A, B

Nematus glutinosae Cameron, 1882: 193-194. Type locality: Great Britain, England, Worcestershire. LT designated below.

Nematus viridissimus Möller, 1882: 179. Type locality: Sweden, Skåne, Skrifvaremöllan vid Tvedörra lägerplats. LT designated by Lindqvist (1962).

Note.

Cameron’s article was published in February 1882, according to the issue wrappers and printed in the journal itself. Möller’s article was published no earlier than mid December 1882, based on an advertisement inside front issue wrapper dated December 1882, and the proceedings of the Entomologiska Föreningen meeting on 14 December 1882 published in the same issue (pp. 195-203). The seniority of the name Euura glutinosae has previously been overlooked. Loth (1913) used Pteronus glutinosae as the name for this taxon, and following Article 23.9 ( ICZN 1999), Euura glutinosae is therefore the valid species name.

Similar species.

Most similar species are E. dispar and E. viridis . Compared to E. dispar it possibly has slightly smaller denticles of serrulae. Differences from E. viridis are not entirely clear. Male penis valves are most similar to E. viridis . There is possibly a larger gap between paravalva and valvispina compared to E. viridis .

Genetic data.

COI. Based on 3 specimens, maximum within species distance is 0.15% and the nearest neighbour, diverging by a minimum of 0%, is Euura dispar , but possibly also Euura brevivalvis , and Euura viridis . BINs: BOLD:ACF5540 (main cluster), but possibly also BOLD:AEC8057 and BOLD:ABZ5797.

Nuclear. Based on 2 specimens, maximum within species distance is 0% (0.02% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.63%, is Euura dispar .

Host plants and behaviour.

Hosts: Alnus species; A. glutinosa ( Macek et al. 2020), A. incana ( Kangas 1985) and A. cordifolia ( Schedl 2010). Intriguing, but requiring confirmation, are comments by Pschorn-Walcher and Altenhofer (2000), that " Nematus prasinus " larvae, although they strongly preferred Alnus species, also accepted Betula , Carpinus and Corylus in feeding tests. Two generations per year ( Weiffenbach 1985; Pschorn-Walcher and Altenhofer 2000).

Distribution.

Nearly all published records are from the West Palaearctic (Europe, Georgia, Zinovjev 1978; Taeger et al. 2006), apart from a specimen from Mongolia recorded as Nematus viridissimus by Haris (2002). Specimens studied are from Austria, France, Germany, Russia (Moscow Oblast), Sweden, United Kingdom.

Type material.

Nematus glutinosae Cameron, 1882. Lectotype, here designated, ♀, B.M.TYPE HYM.I.623, BMNH. “Type” "B.M.TYPE HYM.1.623" "HOLOTYPE ♀ Nematus glutinosae Cameron det. R.B.Benson.1938" "Bred 21/9/75; the L. VIII on Alnus glutinosa . Worsh" "Cameron. 96-76. Worcester" “polyspila”, BMNH.

Nematus viridissimus Möller, 1882. LT, ♀ GNM-HYME000000210, GNM. Koch (2000) wrongly ascribed holotype status to this specimen. However, the discussion of the specimen as the type by Lindqvist (1962) satisfies the requirements of Article 74.6 ( ICZN 1999) for the designation of a lectotype.

Figures

Figure 8. Lancets of Euura bergmanni group. A Euura dispar DEI-GISHym 84146 B Euura viridis DEI-GISHym 21364 C Euura glutinosae DEI-GISHym 80498 D Euura brevivalvis DEI-GISHym 31135.

Figure 11. Penis valves of Euura bergmanni group. A Euura bergmanni ZMUO. 032583 B Euura dispar DEI-GISHym 88519 C Euura viridis ZMUO. 030834 D Euura brevivalvis DEI-GISHym 84227 E Euura brevivalvis ZMUO. 030870 F Euura sylvestris DEI-GISHym 83594 G Euura sylvestris ZMUO. 033416 H Euura glutinosae DEI-GISHym 84096 I Euura leptocephalus DEI-GISHym 88730 J Euura respondens DEI-GISHym 12514.

Figure 16. Euura glutinosae adults. Female DEI-GISHym 11403 (A, B), male DEI-GISHym 84096 (C, D).

Figure 24. Euura glutinosae (A, B) and possible Euura dispar (C-E) larvae A, B France 2007 Alnus glutinosa (photos: Henri Savina) C Pyrenees 2010 Betula (photo: Henri Savina) D Finland 2020 swept larva E DEI-GISHym 12579 Germany 2020 Betula pendula. The larvae with paired red dots (C, D) have earlier been considered as representing Pteronidea pseudodispar that we consider synonymous to Euura dispar, but whether this type of larvae truly represent Euura dispar remains unconfirmed.