Given the task definition and input, reply with output. In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.

phylum may contain the extinct conulata, which may also belongs to its own phylum. This phylum is now thought to include Myxoza and Polypodiozoa, a parasite found in sturgeons' eggs. This phylum contains the class cubazoa, whose members move with a contractile tissue called velarium. Most members of this phylum have bodies made of mesoglea. Its members, like the sea wasp and sea pen, develop nematocysts, cells that fire a bulb-shaped projection on the end of a cord and deliver a toxic injection to prey. They go through polyp and medusa phases. For 10 points, name this phylum that contains stinging animals like anemone and jellyfish.
Science