Figure 3.

Osteohistology of Tethyshadros insularis revealing the somatically immature status of the holotype (a) and the older, potentially somatically mature stage attained by SC 57247 (b). Count of lines of arrested growth (LAGs⁷¹) is shown in (a) and (b), while differences in histological texture organisation between the inner cortex and the outer-peripheral margin of the bone are shown in (c) for SC 57021 and in (d) for SC 57247. Abbreviations: alb, avascular-laminar to sub-parallel-fibered bone tissue; pv, primary vascularity; rb, remodelled bone tissue; so, secondary osteons; EFS?, tentatively identified External Fundamental System.