Added to the British list by Green in 2020. A single female was found in Bedfordshire in 2019.
The dorsal surface of the abdomen is black with a narrow, yellow, lateral margin. The mesonotum is black sometimes marked with yellow along the hind margin of the frontal lobe. The stigma and veins of the leading edge of the forewing are all yellow as are the legs. In males the stigma is orange yellow with brown wing venation. Cell C of the forewing has microtrichia from the base to the apex of the cell. The head is for the most part black on top and yellow on the face and is noticeably glossy through lack of microsculpture or punctures. The antennae have an entirely yellow scape and reddish-yellow flagellae becoming gradually darker from base to apex. There are inconspicuous crests to the front of the ocelli. The right mandible is tridentate. The hind tarsal claws are dentate with the inner tooth subequal to the apical tooth.
Pamphilius marginatus larvae feed in leaf rolls on hornbeam, or sometimes hazel.
Size: 8.0 - 10.5mm
Flight period: May to June
Plant associations: Carpinus betulus and Corylus avellana (hornbeam and hazel)
The National Biodiversity Network does not currently have a map for this species.
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
Viitasaari, M. ed., 2002. Sawflies (Hymenoptera, Symphyta), I: a review of the suborder, the Western Palaearctic taxa of Xyeloidea and Pamphilioidea (Vol. 1). Tremex Press.