The Staurozoa are a Class in the phylum Cnidaria. It includes the stalked jellyfish. It was an order within the Class Scyphozoa, but recent genetic work has shown it to be a class of its own. This is a small class of about 50 species, mostly inshore and quite small. The recent discovery of some Staurozoa near deep sea hydrothermal vents was a surprise, and makes it clear that there is much more to learn about them.