The female is largely black. THe labrum and palps are off-white. Mandibles reddish-brown. The upper edge of the pronotum usually marked pale. The mesonotum marked with brown and the mesopleuron with a thin pale stripe on the upper side of the mesopleural groove. Sternites extensively pale. Legs mostly pale. The stigma is pale brown and the costa off-white.
Males occur in similar numbers to the females. The male differs in having pale antennae to some degree. The thorax and abdomen are extensively yellowish-brown
Heptamelus ochroleucus larvae feed within the petiole of fern leaves (genera unknown).
Size: Female: 4.8 - 5.5mm, Male: 3.6 - 5.2mm
Distribution: England, Scotland, Wales, Ireland
Flight period: May to June
Plant associations: Filices, unknown genera (ferns)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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.