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In page African clawless otter:

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Aonyx capensis is a member of the weasel family (Mustelidae) and of the order Carnivora. The earliest known species of otter, Potamotherium valetoni, occurred in the upper Oligocene of Europe: A. capensis first appears in the fossil record during the Pleistocene.[1] Aonyx is closely related to the extinct giant Sardinian otter, Megalenhydris.[citation needed]