Fenusa dohrnii

Widely recorded throughout mainland Britain, as well as occurring on Orkney and Lundy (Musgrove, 2023).

Males are not known. Antennae are longer than the thorax with the third segment at most 1.5 times as long as broad, but with the fourth and fifth segments each more than twice as long as broad.

Fenusa dohrnii larvae mine the leaves of alder trees and can be confused with Heterarthrus vagans mines. However, Fenusa dohrnii mines are often present in multiples in one leaf whereas vagans tend to occur singly. This alone is not sufficient to identify accurately.

Jump to other Fenusa species

Size: 3 - 4mm

GB IUCN Status: Least Concern
GB Rarity Status: None

Distribution: England, Scotland, Wales, Ireland

Flight period: Bivoltine, May to June and August.

Plant associations: Alnus spp. (alder)


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. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished