The genus Xenoturbella lives off the coast of Scandinavia, Scotland and Iceland. It shares a simple body structure with the acoelomorph worms: these organisms, which reach a maximum size of just a few ...
Who came first – sponges or comb jellies? A new study reaffirms that sponges are the oldest animal phylum – and restores the classical view of early animal evolution, which recent molecular analyses ...
Figure 1: Phylogenetic analyses of 170 nuclear proteins and 13 mitochondrial proteins support a monophyletic chordate clade and an independent deuterostome phylum of Xenoturbellida. We note that ...
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