(In addition to nematocysts, the other two classes of cnidae are spirocysts and ptychocysts.) The phylum first appears in the late Precam-brian or Vendian period, and the group is generally considered the sister group of all meta- Some jellyfish are active predators that use their tentacles to capture and subdue prey others are filter feeders that catch small prey and food particles that drift by in the water column. The name of the phylum derives from cnidos, meaning "stinging nettle" in Greek, and refers to the stinging nematocyst class of cnidae-the microscopic structures that define the phylum. Cnidarians are a major phylum of aquatic (and mostly marine) invertebrates that include many of the most recognizable shoreline creatures, including sea anemones, jellyfish, and corals.
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