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Members of the three existing genera of lungfishes represent different stages in the transition from aquatic to aerial breathing. Neoceratodus, the Australian lungfish, is primarily aquatic and utilizes gill breathing, while its lung offers an accessory means for O2 absorption (Lenfant, Johansen & Grigg, 1966; Johansen, Lenfant & Grigg, 1967). Conversely,(More)