A former biological classification for marine animals with hollow body cavities, including jellyfish, corals, and sea anemones.
From Greek 'koilos' (hollow) + 'enteron' (intestine) + '-ata' (a suffix forming taxonomic names). This was once the main scientific grouping for these creatures.
Scientists reclassified this group because they discovered that some animals thought to be simple relatives of jellyfish were actually evolved differently—taxonomy keeps changing as we learn more.
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