A taxonomic group or term historically used to describe invertebrate animals lacking backbones, or alternatively, all vertebrates.
From Latin combining 'ever' (all) or the prefix 'e-' with 'vertebrata' (vertebrates). This appears in older biological classifications that have been superseded by modern taxonomy.
This word shows how scientific terminology evolves—'Evertebrata' was used inconsistently in early zoology, sometimes meaning 'all animals with backbones' and sometimes 'all animals without,' creating confusion until the modern binomial system clarified everything.
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