When they say 'found' they don't mean as in down the back of the sofa, didn't know it was there. More, they though it was something else but research and DNA shows its a new species.
Previous research had shown that the DNA found in the dolphins differed from that of the known bottlenose speciesTursiops truncatus and Tursiops aduncus.
But in order to define a new species, more evidence is needed. Kate Charlton-Robb of Monash University in Melbourne and her colleagues studied dolphin skulls found in a number of museums, as well as more detailed analysis of DNA, to show that T. australis is clearly a different animal.