Cystonectae is a suborder of siphonophores. It includes the Portuguese man o' war (Physalia physalis) and Bathyphysa conifera.

In Japanese, it is called 嚢泳 (Nōei).

The typical cystonect body plan has a pneumatophore (float) and siphosome (line of polyps) but no nectosome (propulsion medusae).

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