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.

Jump to other Cimbicidae

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.

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 Natural England, unpublished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