Euura chromata ( Rohwer, 1925 ), 2025

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 : 235-236

323 Euura chromata ( Rohwer, 1925) comb. nov.

Figs 318–319

Pristiphora chromata Rohwer, 1925: 11–12 .

Diagnosis

Belongs to the E. bergmanni group. So far only three specimens are known, from Primorsky Krai, Russia. As in E. bergmanni , there appear to be clear colour differences between generations. The overwintering generation (May) has black antenna and dorsally extensively black thorax and abdomen (DEIGISHym83879). Later generations (June–July and perhaps later) are completely or nearly completely pale (DEI-GISHym88888). Among the European species, the most similar are perhaps E. sylvestris and E. respondens , but the claws of E. chromata appear to distinguish it from all European species treated here. The holotype of E. chromata and one of the sequenced specimens (DEI-GISHym88888) have distinct small or large subapical teeth clearly separated from the apical one (not distinctly bifid like in the other species of bergmanni and oligospila groups) and in the second sequenced specimen (DEIGISHym83879) the subapical teeth are minute to small. The clypeus of all three specimens is shallowly emarginate. Of the East Palaearctic species, Euura pallens (see below) seems to have a saw identical to the holotype of chromata (slightly different from the sequenced specimens of chromata ), but has a distinctly emarginate clypeus and bifid claws. Euura filiformis (see below) has intermediate claws and clypeus compared to E. chromata and E. pallens , but the serrulae of the lancet seem to be different (with distinct cypsella, unlike E. chromata and E. pallens ). Whether E. chromata , E. pallens and E. filiformis are conspecific, cannot be answered conclusively at this point without additional material or sequence data from the type specimens.

Type material examined

Holotype Pristiphora chromata

RUSSIA • ♀; Kudia River , Amagu [Amgu]; Jul. 1923; T. Cockerell leg.; USNM, USNMENT00778815 , http://n 2t.net/ark:/65665/37233f010-e9fd-4291-bfff-66c89cf313e8.

Host plants

Unknown.

Genetics

COI

Based on two specimens, maximum within-species distance is 0.61% and the nearest neighbour, diverging by a minimum of 6.94%, is the Euura viridis subgroup.

Nuclear

Based on two specimens maximum within-species distance is 0.07% (0.29% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 3.85%, is Euura respondens .

Distribution and material examined

East Palaearctic. Specimens studied are from Russia.

Figures

Figs 317–320. Lancets of Euura Newman, 1837. 317. brunneipicta (Lindqvist, 1975), holotype, ♀ http://id.luomus.fi/GL.5124. 318. chromata (Rohwer, 1925) comb. nov., holotype, ♀ USNMENT00778815. 319. chromata DEI-GISHym88888. 320. pallens (Konow, 1903), lectotype, ♀ GBIF-GISHym3863.