Topic: Ancistrocerus parietum
I recently identified a wasp that I photographed as Ancistrocerus parietum. Out of curiosity, I looked it up on the NBN Atlas only to find that there it was considered to be a synonym of Ancistrocerus parietinus. This also appears to be the case in your sandbox. However, everywhere else I look still has these as two distinct species - PESI, GBIF, BWARS and the most recent Checklist of British and Irish Hymenoptera - aculeates (Apoidea, Chrysidoidea and Vespoidea) available there. Also still 2 separate species in Recorder - version 6.28, Dictionary 0000004K. Can you clarify why A. parietum has suddenly become a junior synonym of A. parietinus.
Scottish Wildlife Trust