Blue tunicate (sea squirts) are a group of marine animals that spend most of their lives attached to docks, rocks or the undersides of boats. To most people they look like small, colored blobs. It often comes as a surprise to learn that they are actually more closely related to vertebrates like ourselves than to most other invertebrate animals.Tunicates are part of the phylum Urochordata, closely related to the phylum Chordata that includes all vertebrates.
