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Brazil and Venezuela, and the southern foothills of these mountains form the northerly limit of the genus. It is also present in the upper reaches of the Orinoco River. The genus extends westwards as far as the foothills of the Andes and southwards to the foothills of the Mato Grosso. Its easterly limit is the Atlantic Ocean. The most widespread species is H. guianensis which occurs over the whole range

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