Heptamelus ochroleucus (Stephens, 1835)

Heptamelus ochroleucus

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

Larvae feed within the petiole of fern leaves (genera unknown).

 

Size: Female: 4.8 - 5.5mm, Male: 3.6 - 5.2mm

Status: Local

Distribution: England, Scotland, Wales, Ireland

Flight period: May to June

Plant associations: Filices, unknown genera (ferns)

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.