A colonial marine coelenterate of the order Siphonophora, such as a Portuguese man-of-war.
- Chondrophorines were once classified with another unusual group of hydrozoans, the siphonophores.
- Evolutionary developmental innovations important for colonial integration have evolved independently in many colonial hydrozoans, and are displayed both in Hydractinia and in more advanced forms of siphonophores.
- The siphonophores have achieved a degree of integration such that they are often regarded as solitary organisms in spite of their colonial organization.
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