Euura polepso Prous & Liston & Monckton & Kramp & Vårdal & Vikberg & Heibo & Mutanen 2025, sp. nov.
Creators: name: Prous, Marko
name: Liston, Andrew
name: Monckton, Spencer K.
name: Kramp, Katja
name: Vårdal, Hege
name: Vikberg, Veli
name: Heibo, Erik
name: Mutanen, Marko
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Tenthredinidae
Euura
Euura polepso

description: 135 Euura polepso Prous & Mutanen sp. nov.
urn:lsid:zoobank.org:act: 2049F196-0E59-403C-8D3B-5AF1FEABA7D1
Figs 79–80, 133, 358
Diagnosis
Females are most similar to those of E. leptostigma, E. leucopyga, E. parviserrata, E. polaris, E. sordidiapex, and E. sulciceps, best distinguished by the lancet (lamnium 2.4–2.5 times as long as radix, distinct cypsellae, lamnium gradually broadening from tip to base, horizontal gap between apical and basal parts of consecutive serrulae large). The males are not clearly distinguishable from those of E. leptostigma, E. leucopyga, E. parviserrata, E. polaris, and E. sulciceps.
Etymology
The species name, a noun in apposition, is formed from a combination of the first letters of some of the names of the most similar species (po laris, lep tostigma, so rdidiapex).
Type material
Holotype
FINLAND – Lapin Lääni • ♀; Toskalharji [768:328]; 69.16° N, 21.58° E; 23 Jun. 2021; A. Liston, M. Mutanen, M. Prous and H. Nyström leg.; ZMUO, ZMUO.059303.
Paratypes
FINLAND – Lapin Lääni • 1 ♂; same data as for holotype; ZMUO, ZMUO.059951 • 1 ♂; same data as for holotype; 24 Jun. 2021; ZMUO, ZMUO.059855 • 1 ♀; Kilpisjärvi, Jehkas; 69.09° N, 20.80° E; 550–950 m a.s.l.; 28 Jun. 2020; M. Mutanen, M. Prous and A. Liston leg.; SDEI, DEI-GISHym 84539 • 1 ♂; same data as for preceding; M. Mutanen leg.; ZMUO, ZMUO.041900.
NORWAY – Sogn og Fjordane • 1 ♀, Aurlandsvegen, Nedre Kaldeklettane Lok. 2; 61.021° N, 7.332° E; 1112 m a.s.l.; 26 Jun. 2011; E. Heibo leg.; CEH, N8571.
Other material exmined
FINLAND – Lapin Lääni • 1 ♂; same data as for holotype; 24 Jun. 2021; ZMUO.059930 might also belong here.
Description
Female
Body 5.2–5.5 mm. Colour mostly black. Labrum pale; labial and maxillary palps brown; mandibles reddish-brown at apex; clypeus black or ventrally pale; gena slightly pale; tibia and tarsomeres 1–2 or 1–3 more or less pale; apical third to two-thirds of femora pale; all trochanters and trochantelli, or at least hind trochanters and trochantelli more or less pale; hind coxae basally pale; pronotum black or posteriorly slightly pale; tegula (except medial margin) pale; pterostigma and costa uniformly pale; hypopygium posteriorly, valvifer 2, and terga 8–10 extensively pale; valvula 3 basally pale; cerci pale. Clypeus distinctly emarginate; frontal area between antennae rather flat, not distinctly angulate (approaching “ Amauronematus - type ”); postocellar area about 2.5–3.5 times as broad as long; antenna about as long as costa; mesepisternum smooth or slightly matt; claws bifid; valvula 3 in dorsal view not or slightly tapering, with indistinct carina at posterior edge and sometimes with indistinct invagination posteriorly. Lancet with 19–20 serrulae; lamnium 2.4–2.5 times as long as radix; serrulae triangular with numerous microdenticles, not strongly protruding, and with cypsellae; hair-like setae half or less of annulus length, absent in apical 3–4 annuli.
Male
Body 5 mm. Colour mostly black, darker than female. Labrum brown; labial and maxillary palps brown; mandibles reddish-brown at apex; clypeus black or ventrally slightly pale; tibia and tarsi pale or brown; apical third to two-thirds of femora pale; trochanters and trochantelli black to slightly pale; pterostigma and costa more or less pale, costa somewhat darkened in middle; sternum 9 pale. Clypeus emarginate, less so than in female; frontal area between antennae rather flat, not distinctly angulate (approaching “ Amauronematus - type ”); postocellar area about 2.5–3.5 times as broad as long; antenna about as long as or somewhat shorter than costa and pterostigma combined; mesepisternum smooth or slightly matt; claws bifid; projection of tergum 8 distinct, about as long as broad and with truncate apex.
Host plants
Unknown.
Genetics
COI
Based on 5 specimens, maximum within-species distance is 0% and the nearest neighbour, diverging by a minimum of 0.76%, is Euura leptostigma.
Nuclear
Based on 4 specimens, maximum within-species distance is 0.25% (0.31% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.41%, is Euura polaris.
Distribution and material examined
Palaearctic. Specimens studied are from Finland, and Norway.
description: Published as part of 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), pp. 1-377 in European Journal of Taxonomy 977 on pages 80-83, DOI: 10.5852/ejt.2025.977.2799, http://zenodo.org/record/15019574