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Crinoid
Taxonomy
Phylum: Echinodermata
Class: Crinoidea
Diagnostic Features
Crown
Stalk
Pentaradial symmetry
Ossicles
Calyx
Pinnule
Holdfast
Way of life
Benthic (some pseudoplanktonic)
Filter feeders
Stratigraphic range
Ordovician to present
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