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a term used by Aristotle for an unidentified grey-coloured waterside bird.

Many of the species have been treated under other generic names at various times in the past, but these treatments leave Calidris polyphyletic; synonyms are in brackets in the list below.

The genus contain 24 species:

* Red knot Calidris canutus
* Great knot Calidris tenuirostris
* Surfbird

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