The mizu replaced its ancestor gastrarmo. It has doubled in size to 8 mm long. Its front arms have developed primitive filtering gills. It can both absorb food as well as oxygen from the water. Its back jet legs have improved even more to help it escape predators faster. On its sides, back and belly are the beginnings of fins to help keep it stable when jetting. Its jets also can produce spores which it can asexually make when it has enough spare energy to do so.
Living Relatives (click to show/hide)
None found. Note that this does not necessarily mean it has no living relatives at all, but that, assuming all taxonomy is filled in, its entire phylum is extinct; any relatives it does have likely do not resemble it.