A rare beetle, never recorded before in mid Wales, has been found at a lake in the Brecon Beacons.
The beetle's habitat is usually near rivers and lakes
The two-tone reed beetle donacia bicolora, usually only found at a few sites in the south of England, was discovered at Llangorse Lake.
Gareth Ellis, of Brecon Beacons National Park Authority (BBNPA) said it was "very exciting".
It was last spotted in Wales on Anglesey in the 1940s but has disappeared from that site.
The beetle was also recorded in Glamorgan in the 19th Century.
Mr Ellis, who is BBNPA biodiversity officer, added: "Finds like this show us how little we know about the wildlife even in familiar areas of the national park.
"It proves how much we need to gather accurate information so we can work with landowners to secure a future for some of Wales' most threatened wildlife."
The survey also identified the rare waved carpet moth at Pontneddfechan, which was last seen in the national park in the 1920s.
Norman Lowe of the Brecknock Moth Group said: "Moths are amongst the most colourful and diverse groups of Wales' wildlife but because most species fly at night they are rarely seen."
The surveys were organised by BBNPA and the Biodiversity Information Service for Powys (BIS).
Janet Imlach, manager of BIS, said: "We are eager to gather all records of animals and plants in the BBNP and Powys so that we can develop an accurate picture of the state of our natural environment."