An order or taxonomic group of small marine animals including the genus Cephalodiscus.
From 'cephalodiscus' (genus name) + '-ida' (order suffix). Taxonomic classification for these organisms at the ordinal level.
This group is crucial to evolutionary biology because they sit at the boundary between invertebrates and the ancestors of vertebrates—studying them is like looking at a living bridge between two major branches of the animal kingdom.
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