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Growth dynamics of the primary spine of the cidaroid sea urchin Phyllacanthus imperialis was assessed for the first time using pulsed 26Mg‐labeling and NanoSIMS isotopic imaging. The sea urchin was incubated twice (for 48 h) in artificial seawater with elevated level of 26Mg. After each labeling event, the sea urchin was returned for 72 h to seawater with natural isotopic abundance of 26Mg. NanoSIMS...
The variability of δ 13 C and δ 18 O was determined within the columnal facet of individual ossicles, within different regions of skeletons and within bulk skeletons of extant stalked crinoids. Isotopic compositions of individual ossicles may vary by up ~1‰ for both isotopes, whereas isotopic variability within a skeleton may be as high as ~2.8‰ for δ 13 C and ~1.2‰ for δ ...
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