Nature research paper: Spiny chondrichthyan from the lower Silurian of South China
, Transversely sectioned fin spine fragment shown in part., showing detail of the spine’s tissue structure. Portion of a longitudinally sectioned pectoral fin spine . cc, calcified cartilage; cb, cellular bone; lz, lamellar zone; vz, vascular zone.
Scale bars, 1 mm , 0.5 mm , 0.25 mm , 0.2 mm and 0.05 mm.Optical micrographs , scanning electron micrograph and volume renderings based on synchrotron and microcomputed X-ray tomography data., Fragment of a pectoral fin spine wall fused to a partial pinnal plate in external view., Horizontal virtual section through a partial pinnal plate fused to a pectoral fin spine fragment ., Lateral view of an admedian fin spine fused to a pinnal plate fragment ., Lateral view of an incomplete admedian fin spine fused to a fragment of pinnal plate ., Portion of basal wall of an admedian fin spine sectioned along its long axis, apical to the left., Vertical virtual slice through V27436.1 in ventral view., Horizontal virtual slice through the prepectoral spines of V27436.1. Arrowheads point to anterior. admfs, admedian fin spine; al, ascending lamina; bp, basal plate; cb, cellular bone; pfs, pectoral fin spine; pi, pinnal plate; pps, prepectoral spines; s1–4, scales 1–4; sc, scale crown; vl, ventral lamina. Scale bars, 1 mm , 0.5 mm and 0.2 mm .Volume renderings based on synchrotron X-ray tomography data , optical micrograph and scanning electron micrograph ., Trunk scale with an anterior replacement odontode and ‘exploded view’ of the same specimen revealing the resorption surfaces in the scale crown and base., Basal view of an asymmetrical trunk scale and the crown and base of the same specimen in crown aspect demonstrating absence of resorption surfaces in contrast to V27435.10., Transverse virtual slice through V27435.1 at the level of the primordial odontode., A partially resorbed pinnal plate scale highlighted in a dermal shoulder girdle fragment shown in external view., Vertical virtual slice through the pinnal plate and fin spine wall of V27433.1., Partially resorbed pinnal plate scale shown in superimposed onto an isolated trunk scale . Image of resorbed scale reflected and magnified 1.5x the scale in . 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 and 0.5 mm .
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