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In page Crex:

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The taxonomy of the small crakes is complicated, but the closest relative of the corn crake is the African crake, C. egregia. This was first described as Ortygometra egregria by Wilhelm Peters in 1854 from a specimen obtained in Mozambique,[3] and has variously been placed in the genus Porzana or its own genus, Crecopsis, but is now more usually placed in Crex.[4][5] The Porzana crakes are the closest relatives of the genus Crex, particularly the ash-throated crake, Porzana albicollis, which has occasionally also been allocated to Crex.[6]