Fig. 5From: The functional head of the Cambrian radiodontan (stem-group Euarthropoda) Amplectobelua symbrachiata Alignment of gnathobase-like structures and reduced transitional flaps of A. symbrachiata. a, YKLP 13323a. b, close-up of a reduced transitional flap (boxed in d), arrows indicating the transverse lines. c, interpretative drawing of a. d, close-up of reduced transitional region (boxed in a). See Methods for abbreviations. Scale bars: a, c, 5Â mm; b, 0.5Â mm; c, 2Â mmBack to article page