This is the calyx of the Carboniferous crinoid Amphoracrinus (height approximately 4 cm). Three basal, five radial, and five brachial plates form the lower part of the calyx. A plated, domed tegmen covers the calyx and there is a pronounced anal tube. Although only rarely preserved, the arms are known to branch many times. The whole calyx structure is rigid.
Apiocrinites has a distinctive barrel-shaped calyx (approximately 4 cm in height). The stem is formed from robust columnals and can be up to 15 cm in length. It swells at the base forming a holdfast that cemented the crinoid to the substrate. Such crinoids are associated with marine hardgrounds and have been found with encrusting organisms. Often only the robust holdfasts of these crinoids are preserved.
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