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. 2012 Nov 29;9:33. doi: 10.1186/1742-9994-9-33

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Copyright ©2012 Riesgo et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Phylogenetic position of the higher taxonomic ranks of the species selected for this study, and accessory pictures of the living animals.a.Petrosia ficiformis. b.Crella elegans. c.Cerebratulus marginatus. d.Cephalothrix hongkongiensis. e.Chiton olivaceus. f.Octopus vulgaris. g. Sipunculus nudus. h. Hormogaster samnitica. i. Metasiro americanus. j. Alipes grandidieri. (Pictures taken by Ana Riesgo (a), Alicia R. Pérez-Porro (b), Gonzalo Giribet (c, f, j), Sichun Sun (d), Jiri Nóvak (e), Gisele Kawauchi (g), Marta Novo (h), and Prashant Sharma (i).