Jellyfishes are softbodied, free-swimming aquatic animals with a gelatinous umbrella-shaped bell and trailing tentacles. The bell can pulsate to acquire propulsion and locomotion. The tentacles may be utilized to capture prey or defend against predators by emitting toxins in a painful sting. Jellyfish species are classified in the subphylum Medusozoa which makes up a major part of the phylum Cnidaria, although not all Medusozoa species are considered to be jellyfish
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Ancoracysta twista does not fit with any known group of organisms but appears to belong to an early lineage of eukaryote that was previously unknown. The unusually large number of genes in its mitochondrial genome opens a window into the early evolution of eukaryotic organisms.