Hydrozoa (Hydrozoans) is a class of cnidarians. There are 4058 species of Hydrozoans, in 590 genera and 134 families. They are carnivores. They have asexual reproduction and sexual reproduction.
EOL has data for 20 attributes, including:
The environments in which many hydrozoans species are known to live. Select an environment to see its hydrozoans species checklist.