English: Nuucichthys rhynchocephalus gen. et sp. nov. and its phylogenetic position within deuterostomes. (a) Reconstruction of the animal in its putative living environment (credit: Franz Anthony). (b) Simplified topology recovered from the analysis of a modified version of Tian et al.’s dataset [3] through Bayesian inference (see electronic supplementary material, figure S1, for complete tree). Numbers at the nodes indicate posterior probability values. Note that the phylogenetic placement of vetulicolians remains highly debatable, but the exclusion of these organisms from our analysis resulted in essentially the same tree topology (electronic supplementary material, figure S2).