The sighting at RSPB Saltholme is only the fourth time the Reed Minor has been seen in County Durham.
A nature reserve has identified its 500th species of moth, one that has not been seen there for 50 years.
Other important moth species to be discovered recently include the micro-moths Tansy Plume, Saltern Lance, the Northern Crescent and the Sweet Grass Minor, the most northerly sighting of this species to date. "Moths are fascinating creatures and a window into the wider world of insects and biodiversity," Mr Pritchard said.
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