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Crinoidea

A Dictionary of Zoology | 1999 | | © A Dictionary of Zoology 1999, originally published by Oxford University Press 1999. (Hide copyright information) Copyright

Crinoidea (feather stars, sea lilies; phylum Echinodermata, subphylum Crinozoa) The most primitive living class of echinoderms, whose members have a long stalk (or, rarely, are sessile without a stalk, or free-swimming), a calyx (lower surface) composed of regularly arranged plates, well-developed, movable arms, mouth and arms on the upper surface, radial food-grooves on the arms, leading to the mouth, and tube feet on the arms. The more primitive types are attached to the sea floor by stalks, the more highly evolved types are free-swimming. Crinoids are known with certainty, as Eocrinoidea, from the Lower Ordovician onwards, and were fully modern by the end of the Palaeozoic.

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