dipnoi defined in 1951 yeardipnoi - dipnoi (dipneusti);
dipnoi - Lung-fish. A sub-class of Osteichthyes or of Choanichthyes. Fresh-water. Fairly common fossils, but only three living genera, all tropical: Protopterus (African), Lepidosiren (South American), Epiceratodus (Australian). Bony skeleton; paired fins with a central skeletal axis; nostrils opening both on to face and into mouth; cosmoid scales or derivatives of them. Differ from Crossopterygii in their peculiar tooth plates, used to crush shells of small molluscs on which they feed. Have functional lungs, like Polypterus and many early fossil fish of other groups. First appear in Devonian (about 400 million years ago).
near dipnoi in Knolik
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