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Introduction, , , , , , Dipnoi (Gr. di-two, pnoe-breathing) is a small order of fresh water bony fishes., They are a group of sarcopterygiian fish, are commonly known as the lungfish., They respire by gills and lungs., , Dipnoi evolved during Devonian petiod., , They are characterized by short jaws, crushing plate like tecth, internal nares,, reduced exo- and endo: skeleton, and diphycercal tail.

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> Dipnoi (Gr. di-two, pnoe-breathing) is a small order of, fresh water bony fishes., , > They respire by gills and lungs., , > Dipnoi evolved during Devonian period., , >They are characterized by short jaws, crushing plate like, teeth, internal nares, reduced exo- and endo- skeleton,, and diphycercal tail., , >The air bladder i.e., so called ‘lungs’ are one or two., They are functional with related changes in the, , circulatory system and in the heart.

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Distribution, , , , Modern lung fishes show discontinuous distribution,, , The three surviving genema of lung fishes are Neocenatodus, Protoptems and Lepidasiren,, All are inhabitants of river., , Neocenatodues is found only in the Burnett and Mary rivers of Queens-land in, Australia, so commonly called as ‘Burnett Salmon’ or Australian lungfish,, , Protoptenis lives in lange lakes and rivers of tropical Africa, It is commonly called as, ‘Nile lungfish’ or African lung fish,, , Lepidosiren is found in river Amazon and Paraguay basin in South America., It is commonly called as ‘Amazon lungfish’ or South American lungfish,, , by Semunah Soho