IUCN threat categories

Cook, A.A. (2015) A Review Of The Hemiptera Of Great Britain: The Aquatic And Semi-Aquatic Bugs (Dipsocoromorpha, Gerromorpha, Leptopodomorpha & Nepomorpha). Natural England Commissioned Report Necr188. Natural England.
Bantock, T. (2016) A Review Of The Hemiptera Of Great Britain: The Shieldbugs And Allied Families (Coreoidea, Pentatomoidea & Pyrrhocoroidea). Natural England Commissioned Report Necr190. Natural England.