“…This similarity may reflect an ecological difference that may itself be tied to differences in habitat. The coelacanth lives in deep water in the Indian Ocean, and its paired fins move in a way reminiscent of a tetrapod walk, but this movement is performed primarily off the substrate (Fricke, 1993). Neoceratodus lives in rivers and lakes that rarely dry out (Kemp, 1986, p. 184), and it is not an obligate air breather, unlike Lepidosiren and Protopterus (Kemp, 1986, p. 183).…”