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Fig. 2. Schematic representation of the two potential hyoid-depression mechanisms (A,B) in Clarias gariepinus. Colours and symbols correspond to those in Fig. 1. l-puh-hh, ligamentum parurohyalo-hypohyale; m-epax, epaxial muscles; m-hypax, hypaxial muscles; m-sh, musculus sternohyoideus; o-puh, os parurohyale.