Fig. 6From: The swimming trace Undichna from the latest Devonian Hangenberg Sandstone equivalent of MoroccoA, B Interpretative drawing of the two morphotypes of the ichnospecies Undichna britannica. C Schematic sketch of the anatomical features of a potential tracemaker (here an acanthodian as example). D Mode of movement based on the anatomical-controlled features recorded within the described Undichna britannica from MoroccoBack to article page