1. Coelenterates typically having alternation of generations; hydroid phase is usually colonial giving rise to the medusoid phase by budding: hydras and jellyfishes
   - class Hydrozoa

1. Colonial coelenterates having the polyp phase dominant
   - hydroid

Type of: class, cnidarian, coelenterate

Part of: Cnidaria, Coelenterata, phylum Cnidaria, phylum Coelenterata

Encyclopedia: Hydrozoa

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