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Basal disk

the flattened basal surface by which coelenterate polyps attach to the substrate.
Historical Examples

The basal disk is even narrower and is not splayed out round the edges.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The basal disk is then turned round and fixed to the new support.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale

The basal disk is liberated and the tentacles contract, dragging the column, which still lies prone, along as they do so.
Freshwater Sponges, Hydroids & Polyzoa Nelson Annandale


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