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Specialized cells called cnidocytes contain nematocysts. These are used for anchorage, defense and capture of prey. Phylum Cnidaria. Close-up of Phylum Cnidaria In: Atkinson. LJ and Sink KJ (eds) Field Guide to the Ofshore Marine Invertebrates of South. Africa, Malachite Marketing and Media, Pretoria, pp Apr 8, 2019 - Symmetry in Cnidaria compared to other animals. Nemanostella. Clonal reproduction in anemones. Internal or external budding. Pedal laceration. Fission. Phylum Cnidaria. Characteristics. • True tissue level of organization. • Gastrovascular cavity: one opening, a mouth, where food enters and waste leaves. Animals: Phylum Cnidaria; Ziser Lecture Notes, 2015.9. 1. Phylum Cnidaria. (=Jellyfish & Corals). 9,000 living species, 9,300 fossil species include: jellyfish. This ancient phylum of mostly marine organisms is best known for its contribution or visited a seashore can hardly be impressed with the Cnidaria as a phylum.Phylum Cnidaria. Anemones, corals, jellyfishes, hydras and relatives by John R. Finnerty. Animal Phylogeny. PROTOSTOMIA. Chordata. Hemichordata. radial symmetry. • blind sac gut (= coelenteron or gastrovascular cavity). • diploblastic with mesoglea. • polyp and medusa body forms. • nematocysts radial symmetry. • blind sac gut (= coelenteron or gastrovascular cavity). • diploblastic with mesoglea. • polyp and medusa body forms. • nematocysts