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  1. Hydra | Freshwater, Cnidaria, Polyp | Britannica

  2. Hydrozoa Information | Aquatic Invertebrates | Earth Life

  3. People also ask
    The Hydrozoa (Hydrozoans) is a class of animals that belong to the phylum Cnidaria, along with corals and jellyfish. There are about 3500 known species in this class. They are very small predatory animals and can be solitary or colonial.
    Hydrozoa is a class of aquatic invertebrates that are closely related to corals, jellyfish, and sea anemones. They belong to phylum Cnidaria
    Majority of Hydrozoans are found in the ocean and live in saltwater but some species, like Hydra, are found in freshwater. Hydrozoa displays a fascinating array of biological diversity, complexity, and adaptability.
    The life cycle of a hydrozoan is believed to originate as a sessile polyp. In this stage it multiplies asexually. Animals in the polyp stage are known as “hydroids”. The polyp stage can then bud, forming a free-swimming, planktonic animal, like the jellyfish. In this stage they are known as “medusa” and can produce eggs or sperm.
  4. Cnidarian | Definition, Life Cycle, Classes, & Facts | Britannica

  5. Introducing the Class Hydrozoa | Animal World

  6. Hydroids (Cnidaria, Hydrozoa) from the Northern and North

  7. Siphonophores: Habitat, Anatomy, Diet & Other Facts

  8. Integrative Systematics and Biogeography of the Hydrozoans ...

  9. A hydrozoan from the eurypterid-dominated Silurian Bertie Group ...

  10. Systematics and character evolution of capitate hydrozoans

  11. New insights into the diversity and ecology of benthic hydroids ...