A physonect siphonophore. Siphonophores are colonial relatives of jellyfish. At the top of this colony, you can see a small pneumatophore, a gas-filled float, that helps the animal stay upright. Below this are the swimming bells, individuals that help propel the colony through the water. The final section contains both reproductive and feeding individuals.

A physonect siphonophore. Siphonophores are colonial relatives of jellyfish. At the top of this colony, you can see a small pneumatophore, a gas-filled float, that helps the animal stay upright. Below this are the swimming bells, individuals that help propel the colony through the water. The final section contains both reproductive and feeding individuals. Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin.

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