Definitionn. a genus of sea anemone common in rock pools
Last update: October 22, 2015
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Genera: (a) Ore supero; basi se affigens: Actinia, Ascidia. [Please select]
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The same Actinia (Metridium marginatum) fully expanded; natural size. [Please select]
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] Among the nomadic Polyps is a small floating Actinia, called Arachnactis, (Fig.) [Please select]
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This Actinia is covered with innumerable little transverse wrinkles (see Fig.) [Please select]
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At this stage it much resembles a young Actinia. [Please select]
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View from above of an Actinia with all its tentacles expanded; _o_ mouth, _b_ crescent-shaped folds at extremity of mouth, _a a_ folds round mouth, _t t t_ tentacles. [Please select]
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Notwithstanding its extraordinary sensitiveness, the organs of the senses in the Actinia are very inferior, consisting only of a few pigment cells accumulated at the base of the tentacles. [Please select]
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