Cystonectae (from Ancient Greek κύστις (kústis), meaning "bladder", and νηκτός (nēktós), meaning "swimmer") is a suborder of siphonophores.Schuchert, P. (2019). World Hydrozoa Database. Cystonectae. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=135334 on 2019-03-11 It includes the Portuguese man o' war (Physalia physalis) and Bathyphysa conifera.
In Japanese, it is called Japan Agency for Marine-Earth Science and Technology. (2009 onwards). Biological Information System for Marine Life (BISMaL). Accessed on 2018-11-21. available online at http://www.godac.jamstec.go.jp/bismal ().
The typical cystonect body plan has a pneumatophore (float) and siphosome (line of polyps) but no nectosome (propulsion medusae).
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