Siphonophora
Siphonophora (Siphonophorida, siphonophores; phylum Cnidaria, class Hydrozoa) An order of cnidarians whose members produce highly polymorphic colonies without skeletons and without free, sexual medusae. They consist of floating or free-swimming assortments of polypoid and medusoid individuals attached to a stem.
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Siphonophora