Rana Cancrivora. Brackish water condition commonly occurs when fresh water meets seawater In fact the most extensive brackish water habitats worldwide are estuaries where a river meets the sea The River Thames flowing through London is a classic river estuary The town of Teddington a few miles west of London marks the boundary between the tidal and nontidal parts of the Thames.
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Systematics The subdivisions of the Ranidae are still a matter of dispute although most are coming to an agreement Several former subfamilies are now recognised as separate families (Petropedetidae Cacosterninae Mantellidae and Dicroglossidae)The genus Rana has now been split up and is much reduced in size While too little of the vast diversity of true frogs has been.
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