Euura leptostigma ( Lindqvist, 1958 )

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 : 62-64

118 Euura leptostigma ( Lindqvist, 1958)

Figs 131, 352–353

Pteronidea leptostigma Lindqvist, 1958: 111–113 .

Pteronidea thunebergi Lindqvist, 1959c: 58–59 . Syn. nov.

Pteronidea curticornis Lindqvist, 1969: 236–237 . Secondary homonym of Nematus curticornis Cameron, 1885 [ Euura pedunculi ( Hartig, 1837) ]. Syn. nov.

Pteronidea melanochroa Lindqvist, 1969: 235–236 . Syn. nov.

Pteronidea tegularis Lindqvist, 1969: 236 . Syn. nov.

Amauronematus nitens Lindqvist, 1977: 93–94 . Secondary homonym of Nematus nitens Thomson, 1888 [ Euura respondens (Förster, 1854) ]. Syn. nov.

Nematus truncicornis Vikberg, 1982 . Replacement name for Pteronidea curticornis Lindqvist, 1969 .

Euura nitidula Prous & Taeger, 2014 in Prous et al. 2014. Replacement name for Amauronematus nitens Lindqvist, 1977 .

Diagnosis

Most similar are E. leucopyga , E. parviserrata , E. sulciceps , E. sordidiapex , E. polepso Prous & Mutanen sp. nov., and E. polaris , which can mostly be distinguished based on the lancets, but the differences can be small. Valvula 3 of some specimens of E. leucopyga and often in E. polaris is rather broad and square-shaped in dorsal view while it is narrower and tends to be more triangular in the other species. The lancet of E. sordidiapex is the most similar to E. leptostigma and may not always be distinguishable. There might be differences in overall shape:

– dorsal margin of lamnium almost straight, basal annuli somewhat higher than middle annuli ......... ...................................................................................................................................... E. sordidiapex

– dorsal margin of lamnium somewhat bent, middle and basal annuli of similar height ...................... ..................................................................................................................................... E. leptostigma .

The lancet of E. polaris is also similar, but the overall shape might be slightly different and it is perhaps (usually?) smaller than in E. leptostigma . The males are not clearly distinguishable from those of E. leucopyga , E. parviserrata , E. sulciceps , E. polepso sp. nov., and E. polaris . Penis valve of E. sordidiapex is slightly different in shape (paravalva similarly broad basally and apically, but apically broader in the other species) and has a smaller valvispina than the other species.

Female

Head extensively pale around eyes to nearly completely black; labrum pale; clypeus extensively or slightly pale; supraclypeal area black or pale; thorax black; pronotum black or posteriorly slightly pale (usually?); tegula pale; pterostigma pale; metafemur and metatibia pale; hind tarsus pale or brown; abdomen dorsally nearly completely black, ventrally mostly black to mostly pale; mesepisternum smooth or slightly matt; valvula 3 rather broad in dorsal view. Head can be rather like in “ Amauronematus ”. Colouration of ZMUO.037269 (mesepisternum slightly matt) fits well with the type of leptostigma .

Type material examined

Holotype Pteronidea leptostigma

SWEDEN – Torne Lappmark • ♀; Abisko; 68.35° N, 18.83° E; 1–5 Jul. 1954; J.E. and R.B. Benson leg.; BMNH, B.M.TYPEHYM.1.783 .

Notes

Mesepisternum smooth; 20 serrulae.

Holotype Pteronidea thunebergi

FINLAND – Inari • ♀; Lemmenjoki; 68.75° N, 26.23° E; 27 Jun. 1917; E. Thuneberg leg.; MZH, http://id.luomus.fi/GL.3595.

Notes

19 (?) serrulae, smooth mesepisternum. Best fit: DEI-GISHym12055 (20 serrulae).

Holotype Pteronidea curticornis

FINLAND – Inari Lapland • ♀; Utsjoki; 69.91° N, 27.03° E; 7 Jul. 1968; V. Karvonen leg.; MZH, http://id.luomus.fi/GL.3563.

Notes

21 serrulae, smooth mesepisternum. Best morphological fit: DEI-GISHym12055 (20 serrulae).

Holotype Pteronidea melanochroa

NORWAY – Troms • ♀; Helligskogen ; 69.20° N, 20.72° E; 30 May 1967 [emergence date from larvae collected in 1966]; J. Kangas leg.; reared from Salix lapponum L.; MZH, http://id.luomus.fi/GL.5140.

Notes

21–22 serrulae.

Holotype Pteronidea tegularis

FINLAND – Inari Lapland • ♀; Utsjoki; 69.91° N, 27.03° E; 17 Jun. 1967; V. Karvonen leg.; MZH, http://id.luomus.fi/GL.3592.

Notes

17–18 serrulae, matt mesepisternum.

Holotype Amauronematus nitens

FINLAND – Lapin Lääni • ♀; Kilpisjärvi; 69.04° N, 20.81° E; 10 Jul. 1968; L.H. Woollatt leg.; MZH, http://id.luomus.fi/GL.2537.

Notes

19–20 serrulae.

Host plants

Salix spp.

Genetics

COI

Based on 12 specimens, maximum within-species distance is 4.26% and the nearest neighbours, diverging by a minimum of 0%, are Euura polaris and Euura sulciceps .

Nuclear

Based on 12 specimens, maximum within-species distance is 0.62% (0.45% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.15%, is Euura sulciceps .

Distribution and material examined

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