Arenaerpeton is an extinct genus of chigutisaurid temnospondyl found in the Terrigal Formation of New South Wales, Australia.

In October 1996, Mihail Mihaildis,[3] a retired chicken farmer, purchased a large slab weighing roughly 1,450 kilograms (3,200 lb) for use in the construction of a garden retaining wall at his private property in Umina Beach, New South Wales.

While landscaper David King was cleaning the rocks, he discovered the holotype specimen of Arenaerpeton supinatus.

[4] In c. 2020, shortly before it was described, the holotype was taken to the facilities of the Australian Border Force so a more complete view of the skeleton could be seen by using X-ray scanners normally reserved for the inspection of cargo.

[1] The length of Arenaerpeton was calculated to be 1.2 metres (3.9 ft);[1] the surviving section of the holotype measures around 94 centimetres (37 in) long.