To date this species has only been recorded twice in Britain, at Fairbourne on the west coast of Wales in 1942 and at Hafren Forest in Montgomeryshire in 1975. There is no reason to consider these records not to relate to wild individuals, and so with no further records for nearly 50 years, the species is considered Regionally Extinct. However, it should still be sought, particularly in Wales (Musgrove, 2023).
A largely green species which can be distinguished from the similar Pachyprotasis antennata by the green stigma (black in antennata).
Pachyprotasis nigronotata larvae feed on a variety of herbaceous plants.
Size: 7 - 9mm
GB IUCN Status: Regionally Extinct
GB Rarity Status: Extinct
Flight period: June
Plant associations: Mentha aquatica, Alchemilla spp., Geum spp. and Plantago spp. (water mint, lady's mantle, avens and plantains)
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
Musgrove, A.J. 2023. A review of the status of sawflies of Great Britain - Phase 2: The Athaliidae and the Tenthredinidae (excluding Nematinae). Natural England, unpublished