Zoology: A New Mouth for Amphioxus Vladimir Soukup, Zbynek Kozmik  Current Biology  Volume 26, Issue 9, Pages R367-R368 (May 2016) DOI: 10.1016/j.cub.2016.03.016 Copyright © 2016 Elsevier Ltd Terms and Conditions

Figure 1 Development of the amphioxus mouth in the phylogenetic context. Schemes of deuterostome embryos (bottom) with depicted positions of prospective mouths (black circles). Mesodermal derivatives are depicted with dashed lines. Amphioxus mouth develops on the left side (upper schemes) through the oral mesovesicle (OMV), a derivative of the first somite, which fuses with the epidermal and pharyngeal epithelia (magenta arrowhead). ‘LD’ and ‘RD’ denote left and right pharyngeal diverticula, numbers mark first and second somites. The hypothesis according to Kaji et al. [3] indicates a separate origin of the amphioxus mouth within deuterostome phylogeny. Homology is proposed between the amphioxus oral mesovesicle and the hydropore of echinoderms or the proboscis pore of hemichordates (magenta arrowheads). Vertebrate and tunicate mouths differ from those of other deuterostomes by development from the pre-placodal region (PPR). Current Biology 2016 26, R367-R368DOI: (10.1016/j.cub.2016.03.016) Copyright © 2016 Elsevier Ltd Terms and Conditions