Pamphilius marginatus - Bordered Spinner
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
GB IUCN Status: Not Applicable
GB Rarity Status: Nationally Rare
Flight period: May to June
Plant associations: Carpinus betulus (hornbeam) and Corylus avellana (hazel).
Green, A.J., 2020. Pamphilius marginatus (Audinet-Seville)(Hymenoptera Pamphiliidae), a sawfly new to Britain from Bedfordshire, British Journal of Entomology and Natural History, 33(3), pp255-258
Lorenz, H. and Kraus M. Die Larvalsystematik der Blattwespen (Tenthredinoidea und Megalodontoidea). - Abhandlungen zur Larvalsystematik der Insekten No. 1. Berlin: Akadamie - Verlag; 1957.
Musgrove, A.J. 2022. A review of the status of sawflies of Great Britain - Phase 1: families other than Tenthredinidae. Natural England, unpublished
Stritt, W. 1937: Die Larve des Pamphilius marginatus Lep. (Hym., Tenthr.). - Mitteilungen der Deutschen Entomologischen Gesellschaft e.V., Berlin 8(2): 20-22
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.