Not a backbone like in vertebrates, but Tunicates are actually chordates. Makes them interesting critters for study.
Ive never seen one with that pattern, but there are SO many species and different styles that Im never suprised when something different pops up. Very nice looking.
Make sure its in a spot with moderate water flow and low light to discourage algae from overgrowing it, and someplace where it can do heavy filter feeding, for best luck with it.