page_title: Hydrozoa
hierarchical_section_title: Hydrozoa
caption_attribution_description: Deutsch: Eine Portugiesische Galeere (Physalia physalis).English: Portuguese man-of-war (Physalia physalis)
context_page_description: The Hydrozoa are a class of the phylum Cnidaria. They are small predatory animals which mostly live in the sea. Their basic life form is the polyp. Some species live singly, others live in colonies. Their classification and evolutionary relationships are still under discussion. The hydroids may be best understood by taking some examples.
context_section_description: The Hydrozoa are a class of the phylum Cnidaria. They are small predatory animals which mostly live in the sea. Their basic life form is the polyp. Some species live singly, others live in colonies. Their classification and evolutionary relationships are still under discussion. The hydroids may be best understood by taking some examples.
caption: The Portuguese Man o' War (Physalia physalis) long misled researchers.
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