Antedonidae: Brief Summary
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Antedonidae is a family of crinoids or feather stars in the phylum Echinodermata. Members of the family are unstalked and have ten feathery arms. They can move about freely and have clawed cirri to attach them temporarily to structures.
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provided by World Register of Marine Species
Centrodorsal cavity moderate to large; rosette not sunken below aboral surface of radial pentagon, its interradial extensions not forming "spoutlike" processes; no calcareous deposit (central plug) within radial pentagon or on rosette; muscular fossae on radial articular faces thin-walled, their faces parallel to oral/aboral axis, or nearly so; articular fossae distal to transverse ridge strongly excavated; brachials from second syzygy onward usually triangular or obliquely wedge-shaped; second brachial syzygy usually at 9+10; distal brachial syzygies evenly and closely spaced; pinnules cylindrical or more or less flattened, never prismatic, and without aboral carination; first two segments of distal pinnules broadened; those beyond the third are elongate; radials 5 except in Promachocrinus, which has 10. (Modified from Clark and Clark, 1967). Molecular evidence indicates that this family is polyphyletic.
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