Metameric organisation of the nervous system in developmental stages of Urechis caupo (Echiura) and its phylogenetic implications


The phylogenetic position of Echiura is still in continuous debate. The commonly accepted view regards Echiura as a distinct taxon, often classified as phylum, which forms the sister group of the Articulata. The alternative view considers Echiura to be a subtaxon of Annelida, which is supported by numerous shared characters. The correct systematic position… (More)
DOI: 10.1007/s00435-002-0059-7


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