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Bourlat, S. J., Nielsen, C., Lockyer, A. E., Timothy, D., Littlewood, J. i Telford, M. J., 2003. Xenoturbella is a deuterostome that eats molluscs. Nature, 424: 925-928 [2]
Hejnol, A.; Obst, M.; Stamatakis, A.; Ott, M.; Rouse, G. W.; Edgecombe, G. D. «Assessing the root of bilaterian animals with scalable phylogenomic methods». Proceedings of the Royal Society B: Biological Sciences, 276, 1677, 2009, pàg. 4261–4270. DOI: 10.1098/rspb.2009.0896. PMC: 2817096. PMID: 19759036.
Israelsson, O. i Budd, G. E., 2005. Eggs and embryos in Xenoturbella (phylum uncertain) are not ingested prey. Development Genes and Evolution, 215: 358-63 [1]Arxivat 2012-10-14 a Wayback Machine.