单词	Cnidaria
释义	Cnidaria /(k)nʌɪˈdɛːrɪə / plural noun Zoology A phylum of aquatic invertebrate animals that comprises the coelenterates.By this usage, the basal metazoans comprise just four phyla (Placozoa, Porifera, Cnidaria, and Ctenophora) and the large clade Bilateria.... Four phyla (Placozoa, Porifera, Cnidaria, and Ctenophora) are typically thought to have an ancient origin within Metazoa. Despite these attempts, relationships among Bilateria, Cnidaria, Ctenophora, Placozoa, and Porifera remain obscure. Origin Modern Latin (plural), from Greek knidē 'nettle'.
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