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Journal: Journal of Experimental Biology
J Exp Biol (2015) 218 (4): 637–645.
Published: 15 February 2015
... deuterostomes or as a sister group to the hemichordate/echinoderm clade (Ambulacraria), which is a sister group of the Chordata. None of these groups has a single longitudinal nerve cord and a brain. A further complication is that echinoderm nerve cords are not likely to be evolutionarily related...