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Chronological distribution of the appearance of taxa in hominin evolution. Dates of first appearance (FADs) are seen to be widely dispersed. ‘Species' (small grey circles) are the full range of recognized taxa; ‘species +’ are those for which it may be claimed there is a significant adaptive change. Homo 1 is the appearance of the genus (H. habilis); Homo 2 is the appearance of H. erectus/ergaster; Homo 3 is the appearance of H. heidelbergensis [33,34,47–52].
