A member of the cystoidea class; a marine creature resembling a pouch with feeding arms.
From the scientific classification 'Cystoidea' with the added agent suffix '-an' (a member of). This term is the singular form used to refer to individual organisms within the class.
Unlike their starfish cousins, cystoideans had a one-way digestive system and most lived attached to the seafloor—imagine being a blob that eats but can't move around!
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