The name is also a pun on the word "cool" in reference to the cold climate of its environment. Koolasuchus was named for the palaeontologist Lesley Kool. A partial skull is also known but has not been fully prepared. Later specimens were found in 1989 on the nearby Rowell's Beach. A jawbone was found in 1978 in a fossil site known as the Punch Bowl near the town of San Remo. It is known from four fragments of the lower jaw and several postcranial bones, including ribs, vertebrae, a fibula, and parts of the pectoral girdle. Koolasuchus was named in 1997 from the Aptian Strzelecki Group of the Wonthaggi Formation in Victoria. The morphology of the skull roof bone lead to the authors suggesting that the temnospondyl was either a member of Plagiosauridae or Brachyopoidea. The intercentrum unquestionably confirmed that temnospondyls were present in the Strzelecki Group. In 1991, additional remains were reported including NMV-PI86040, an intercentrum (part of the vertebra) and NMV-PI86101, an isolated skull roof bone, likely representing either a frontal, a supratemporal or a parietal. Jupp, who did not definitively identify it as that of a temnospondyl due to the Cretaceous age of the specimen, much younger than any other known temnospondyl specimen at the time. The jaw fragment was first mentioned in a 1986 publication by Anne Warren and R. The first fossil of temnospondyls found in the Strzelecki Group was NMV-PI56988, the posterior fragment of a jaw, collected around 1980.
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