An obsolete or alternative taxonomic term for the phylum or class of echiuran worms.
From Latin/Greek combination of 'echis' (viper) + 'oura' (tail) + Latin '-ida' (class suffix), representing an older classification system for these marine organisms.
Taxonomic naming is constantly evolving—Echiurida is a perfect example of how scientists keep reorganizing life's family tree as genetic technology improves, making older classification terms obsolete like old editions of instruction manuals!
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