Holopodidae: Brief Summary
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fourni par wikipedia EN
Holopodidae is a family of echinoderms belonging to the order Cyrtocrinida.
Genera:
Cyathidium Steenstrup, 1847
Holopus Orbigny, 1837
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Diagnosis
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anglais
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fourni par World Register of Marine Species
Holopodina with Cup composed of fused radials attached by slightly extended base to substrate without articulation or column. Radial cavity mostly wide and deep, radial articular facet narrow. Arms divided at primibrachial 1 or the axillary primibrachial generally interpreted as fused primibrachials 1 and 2. Proximal brachials commonly stout and tumid. All brachial articulations muscular, and all secundibrachials with pinnule. Arms when retracted or coiled form cover over adoral side of cup. Distinct triangular and perforated oral plates. No chambered organ or aboral nerve center.
3. Lack, P. (1986)
The Atlas of Wintering Birds in Britain and Ireland. T. & A. D. Poyser Ltd, Calton
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