A taxonomic order or grouping of organisms resembling or related to ascidians, used in biological classification.
From Latin 'ascidium' plus '-oid' (resembling) plus '-a' (plural marker), a scientific naming convention for biological orders.
This term shows how scientists organize life into groups like nested boxes—Ascidioida sits inside Ascidiacea, which sits inside bigger groups, all the way up to the kingdom of animals!
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