Fig. 3

 A comparison of Hox and ParaHox clusters among lophophorates. On the left, bryozoan phylogeny with Phoronida and Brachiopoda follows Saadi et al. [30]. On the right, schematic representation of Hox and ParaHox gene complements of Lophophorata (Hox gene clusters of brachiopods and phoronids follows [20]). For comparison, the putative ancestral lophotrochozoan gene toolkit is provided. The coloured boxes indicate the presences of Hox and ParaHox genes. Arrows indicate transcript directions. Hox genes that are hosted within the same chromosome or scaffold are connected by a gray line. The intergenic spaces are not scaled