Checklist of British and Irish Hymenoptera - Sawflies, ' Symphyta' Liston, Andrew D. Knight, Guy T. Sheppard, David A. Broad, Gavin R. Livermore, Laurence Biodiversity Data Journal 2014 2 1168 1168 Serville, 1823 Serville 1823 Insecta Tenthredinidae Nematus CoL Animalia Nematus (Pteronidea) bipartitus Hymenoptera 0 1168 Arthropoda species bipartitus Pteronidea  Distribution England, Scotland, Wales