Euura fasciata ( Konow, 1897 )

257 Euura fasciata ( Konow, 1897)

Figs 264 View Figs 263–267 , 474 View Figs 464–477

Amauronematus fasciatus Konow, 1897: 177–178 . Lectotype designated by Muche (1975).

Amauronematus perkinsi Benson, 1933: 256–257 . Synonymy by Benson (1958a).

Diagnosis

Pale pterostigma, ventrally extensively pale body, and centrally black abdominal terga with pale anterior and posterior margins usually distinguishes the females from the others in the group. Females of Euura variator can be similarly coloured, but E. variator is found in (sub)arctic habitats, unlike E. fasciata . Males of E. fasciata are also the palest in the group and because of high similarity in penis valves are most easily confused with E. vittata found in the same habitats. The males of the two species may be separated as follows, at least usually:

– distance between inner margins of lateral ocelli about as long as length of postocellar area, abdominal terga laterally extensively pale, dorsally some posterior margins pale, dorsal margin of hind tibia (almost) completely black .................................................................................................. E. fasciata

– distance between inner margins of lateral ocelli larger than length of postocellar area, abdominal terga completely black or slightly pale laterally, dorsal margin of hind tibia usually black only at apex ....................................................................................................................................... E. vittata

Type material examined

Lectotype Amauronematus fasciatus

GERMANY – Mecklenburg-Vorpommern • ♀; Teschendorf in Mecklenburg ; 53.45° N, 13.36° E; 6 May 1896; F.W. Konow leg.; SDEI, GBIF-GISHym4092 . GoogleMaps

Holotype Amauronematus perkinsi

UNITED KINGDOM – England • ♀; Buckinghamshire, Halton, Dancer’s End ; 51.770° N, 0.690° W; 29 May 1930; R.B. Benson leg.; BMNH, B.M.TYPEHYM.1.641 . GoogleMaps

Host plants

Only reliably recorded from Salix caprea (e.g., Benander 1966; Vikberg & Kontuniemi 1971).

Genetics

COI

Based on 9 specimens, maximum within-species distance is 4.71% and the nearest neighbours, diverging by a minimum of 0%, are Euura semilactea and E. variator .

Nuclear

Based on 7 specimens, maximum within-species distance is 0.85% (0.38% based on haplotypes of individual females). The nearest neighbour, diverging by a minimum of 0.4%, is Euura variator .

Distribution and material examined

Palaearctic. Specimens studied are from Bulgaria, Finland, France, Germany, Russia, Sweden, and the United Kingdom.