Extended Data Fig. 5: Resorption features in the dermal skeleton of Fanjingshania renovata.

Volume renderings based on synchrotron X-ray tomography data (a–d, f–i), optical micrograph (e) and scanning electron micrograph (i). a, Trunk scale (V27435.10) with an anterior replacement odontode and ‘exploded view’ of the same specimen revealing the resorption surfaces in the scale crown and base. b, Basal view of an asymmetrical trunk scale (V27435.1) and the crown and base of the same specimen in crown aspect demonstrating absence of resorption surfaces in contrast to V27435.10. c, Transverse virtual slice through V27435.10 at the level of the replacement odontode. d, Transverse virtual slice through V27435.1 at the level of the primordial odontode. e, Longitudinally sectioned trunk scale (V27435.4) with an anterior resorption surface. f, A partially resorbed pinnal plate scale highlighted in a dermal shoulder girdle fragment (V27433.1, partial admedian fin spine fused to a fragment of a pinnal plate) shown in external (ventral) view. g, Horizontal virtual slice through the pinnal plate and fin spine wall of V27433.1. h, Vertical virtual slice through the pinnal plate and fin spine wall of V27433.1. i, Partially resorbed pinnal plate scale shown in (f–h) superimposed onto an isolated trunk scale (V27435. 27). Image of resorbed scale reflected and magnified 1.5x the scale in (i). ad, atubular dentine; admfs, admedian fin spine; bp, basal plate; cb, cellular bone; pi, pinnal plate; po, primary odontodes; ro, replacement odontode; rs, resorption surface; sb, scale base; sc, scale crown; so, secondary odontodes. Scale bars, 1 mm (a–d, f–i) and 0.5 mm (e).