Browsing by Subject "Two-circlet"
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A re-evaluation of crinoid morphology and proposed relationship of crown groups, with insights from biogeography (2011-08)Crinoids are the most primitive living members of the Phylum Echinodermata. Though still present in reduced numbers today, crinoids were the dominant echinoderms from the Ordovician to the Permian. The crinoid body plan ...