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Colonial jellyfish have an unusual feature: multiple water-shooting jets. This simple but elegant system makes them great swimmers. A single colonial siphonophore (Nanomia bijuga) resembles a bunch of tiny jellyfish strung together and is much different than larger, single-jet-powered jellyfish.
Individual colonies have four to 12 jet-like swimming bells, or structures known as nectophores.Image credit: "Marrus orthocanna crop" by Marrus_orthocanna.jpg: Kevin Raskoff, Cal State Montereyderivative work: Crisco 1492 (talk) - Marrus_orthocanna.jpg. Licensed under Public Domain via Commons - https://commons.wikimedia.org/wiki/File:Marrus_orthocanna_cr...
