A taxonomic superclass or grouping of echiuran worms and related organisms.
From 'Echiura' + '-oidea' (zoological superclass suffix), following Linnaean nomenclature for higher-level taxonomic classifications.
Echiuroidea classification represents one of biology's great mysteries—for decades scientists argued whether these worms were annelids or their own thing entirely, and genetic studies finally settled the debate in 2006!
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