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Multidirectional passing wave patterns. (a) Sepia apama: left—competitive display produced by rival males during the spawning aggregation; right—dorsal view of the two motion fields (without skin stretch). (b) The dynamic pattern of the two closely related species, Metasepia pfefferi and M. tullbergi: left—lateral view; right—dorsal view. (c) S. plangon (dorsal view). (d) S. mestus (dorsal view).
