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n.1.(Zool.) A genus of fleshy Alcyonaria, its polyps somewhat resembling flowers with eight fringed rays. The term was also formerly used for certain species of sponges.
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Larval and juvenile ecology of the temperate octocoral Alcyonium siderium Verrill II.
Divers also found seals swimming underwater and large expanses of the soft coral alcyonium digitatum, also known as dead man's fingers, near the Smalls, a remote set of rocks nearly 30 miles off the Pembrokeshire mainland.