Flinders Island cave-slater Echinodillo cavaticus. The world has only two known species of the very distinctive Echinodillo cave-slaters. One is found on the Marquesas Islands in the middle of the Pacific Ocean. This other species is known only from a small cave in southern Flinders Island, where its entire global range is measurable in square metres. We found this one during our Bush Blitz on Flinders Island in March 2014.