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. 2017 Sep 6;7(9):170129. doi: 10.1098/rsob.170129

Figure 1.

Figure 1.

Bilaterian animal phylogeny. The diagram shows (i) the phylogenetic position of the phylum Echinodermata in the ambulacrarian clade of the deuterostomes and (ii) relationships between the five extant classes of echinoderms, which include the focal class for this study—the Ophiuroidea (e.g. Ophionotus victoriae).