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Major axes of body (a) and lower pharyngeal jaw (LPJ; b) shape variation, and (c) mouth angle and size-relative LPJ mass among 57 Crenicichla species. Wire frames depict shapes associated with the extremes of each axis. The Paraná and Uruguay River species flocks are highlighted in colour and designated with codes that correspond to the first letters of the species names shown in figure 2a.
