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. 2022 Aug 10;19(193):20220226. doi: 10.1098/rsif.2022.0226

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© 2022 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Tubercle architecture and regions examined. (a) SEM micrograph (top view) of Paracentrotus lividus interambulacral plate showing the primary spine tubercle and its stereom microstructural variability. Three stereom types can be recognized: (1) microperforate, (2) galleried, and (3) labyrinthic. In addition, the mamelon of secondary spines (ms) is also shown. The region topographic reference is underlined by a solid line circle in which the pores (p) and trabeculae (t) are indicated (arrows). (b) Micro-CT scan of tubercle boss subsection extracted by P. lividus interambulacral plate showing (a) transversal, (b) sagittal and (c) coronal views.