Heptamelus dahlbomi (Thomson, 1870)

Heptamelus dahlbomi

Males are unknown. The female is black except for a small area around the base of the sawsheath, the antennal scape and the tegulae. The stigma is strongly infuscated but pale basally. In dorsal view, setae on the sides of the sawsheath are sparce and concentrated towards the apex.

Larvae feed within the petiole of lady fern leaves. More common on cultivated ferns than Heptamelus ochroleucus.

 

Size: 3.5 - 5.5mm

Status: Local

Distribution: England, Scotland, Ireland

Flight period: May to June

Plant associations: Anthyrium filix-femina (lady fern)

References:

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

Vikberg, Veli & Liston, Andrew. (2009). Taxonomy And Biology Of European Heptamelini (Hymenoptera, Tenthredinidae, Selandriinae). Zootaxa. 2112. 1-24. 10.5281/zenodo.187915.