Fig. 6From: The functional head of the Cambrian radiodontan (stem-group Euarthropoda) Amplectobelua symbrachiata A. symbrachiata, counterpart of YKLP 13323. a, YKLP 13323b. b-c, close-up of a reduced transitional flap (boxed in a and e, respectively), arrows indicating the transverse lines. d, interpretative drawing of a. e, close-up of reduced transitional region (boxed in a). See Methods for abbreviations. Scale bars: a, d, 5Â mm; b, c, 0.5Â mm; e, 2Â mmBack to article page