A planula is the free-swimming, flattened, ciliated, bilaterally symmetric larva of a jellyfish, a hydrozoan cnidarian, or a ctenophore. A cilium (plural cilia) is an Organelle found in eukaryotic cells Cilia are tail-like projections extending approximately "Bilateral symmetry" redirects here For bilateral symmetry in mathematics see Reflection symmetry. A larva ( Latin; plural larvae) is a juvenile form of Animal with indirect development, undergoing Metamorphosis (for example Jellyfish are free-swimming members of the phylum Cnidaria. They have several different basic morphologies that represent several different cnidarian classes including the Hydrozoa ( hydrozoans) are a Taxonomic class of very massive predatory animals which can be solitary or colonial and which mostly live in saltwater Cnidaria (naɪˈdɛəriə is a phylum containing some 9000 Species of Animals found exclusively in aquatic mostly marine, environments The phylum Ctenophora (tɨˈnɒfərə commonly known as comb jellies, is a phylum that includes the Sea gooseberry ( Pleurobrachia pileus) and Depending on the species, the planula either metamorphosises into a miniature version of the adult form (such as some jellyfish and all ctenophores), or navigates through the water until it reaches a hard substrate (some may prefer specific substrates) where it anchors and grows into a polyp. In Zoology, a polyp is one of two forms of individuals found in many species of Cnidarians The two are the polyp or hydroid and the medusa. Planulae of Medusozoa have no mouth or digestive tract and are unable to feed themselves, while those of Anthozoa can feed. Cnidaria (naɪˈdɛəriə is a phylum containing some 9000 Species of Animals found exclusively in aquatic mostly marine, environments Anthozoa is a class within the phylum Cnidaria that contains the Sea anemones and Corals Unlike other cnidarians anthozoans do not have a medusa
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