Trichiosoma laterale - Russet Hairy-clubhorn
All authors agree that Trichiosoma is a genus whose taxonomy has not yet been satisfactorily resolved. Benson (1951) felt that laterale was a synonym of vitellinae. Later Viitasaari (1985,1989) reinstated it as a species in its own right. More recently, Liston (2014) considered it a synonym of Leach's latreillei and perhaps also marginale. There are about a dozen old records and two recent ones that could be assigned to laterale, although the basis for doing so is generally unclear (Musgrove, 2022). Trichiosoma laterale is mainly black but more or less reddish-brown laterally. On the apical tergites, the silky, adpressed pubescence does not obscure the underlying puncturation.
Larvae feed on birch and willow.
Size: 13 - 24mm
GB IUCN Status: Data Deficient
GB Rarity Status: Unclear
Distribution: England, Ireland
Flight period: May to July
Plant associations: Betula spp. and Salix spp. (birches and willows).
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168
Musgrove, A.J. 2022. A review of the status of sawflies of Great Britain - Phase 1: families other than Tenthredinidae. Natural England, unpublished
Viitasaari, M. 1989: Taxonomic notes on the genus Trichiosoma Leach (Hymenoptera, Cimbicidae) II. - Annales Entomologici Fennici, Helsinki 55 (3): 111-129