Living on or within ascidia (sea squirts); describing organisms that inhabit or are found on ascidian bodies.
From Latin 'ascidium' (sac) combined with '-colous' (dwelling or living in), meaning 'living on ascidia.'
Sea squirts are like apartment buildings for tiny organisms—researchers have found hundreds of microscopic creatures living inside a single ascidian, from bacteria to worms, creating an entire ecosystem in one small organism!
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