Cystonectae
| Cystonectae | |
|---|---|
| Illustration of a Portuguese man o' war (Physalia physalis) | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Cnidaria | 
| Class: | Hydrozoa | 
| Order: | Siphonophorae | 
| Suborder: | Cystonectae Haeckel, 1887 | 
| Families and genera | |
| 
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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).