Aneugmenus coronatus - Crowned Fern-sawfly

Formerly very scarce, but with a significant recent increase from 2011 onwards. Most records in England with a few to northern Scotland (Musgrove, 2023).

Differences of opinion exist as to the colouration of males of Aneugmenus coronatus. Females have the clypeus and apical tergite marked with white and pale yellow respectively. Edges of the pronotum may also be pale yellow-marked as may be the front coxae. The head is polished and lacks puncturation (punctured in padi and with tubercles on fuerstenbergensis). The occipital carina at the back of the head reaches to the top of the eyes.

Larvae feed on ferns including lady fern, male fern and bracken. They are green in colour and all larvae in the Aneugmenus genus have a v-notch in the first thoracic annulet behind the head.

Jump to other species of Aneugmenus

Size: 4 - 6mm

GB IUCN Status: Least Concern
GB Rarity Status: None

Distribution: England, Scotland, Ireland

Flight period: May to August

Plant associations: Athyrium filix-femina, Dropteris felix-mas and Pteridium aquilinum (lady fern, male fern and bracken)


Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

Blank, S.M., 1998. Die mittel - und nordeuropaischen Selandriinae (Hymenoptera:Tenthredinidae).

Lacourt, J. 1990: Le genre Aneugmenus Hartig 1837 en Afrique du nord (Hymenoptera Tenthredinidae). - Bulletin mensuel de la Société Linnéenne de Lyon, Lyon 59(6): 170-172

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 Natural England, unpublished

Niu, G.; Wei, M. 2013: Review of Aneugmenus Hartig (Hymenoptera: Tenthredinidae) with description of a new species from China and a key to world species (excluding Neotropical). - Entomotaxonomia, Wugong 35(3): 221-232.