A sea squirt or member of the marine animal class that filters water and has a simple, sac-like body structure.
From Latin 'ascidium' (small bag) and the suffix '-ian' (belonging to), referring to animals belonging to this group.
Ascidians pull off one of nature's most dramatic transformations—starting as free-swimming tadpoles with eyes and nerve cords, they settle down and literally digest most of their own brain when they become adults!
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