Hydrozoa (Hydrozoans) is a class of cnidarians. There are 3758 species of Hydrozoans, in 557 genera and 133 families. This class has been around since the cambrian series 2 epoch. They are carnivores. They have asexual reproduction and sexual reproduction. They are sessile animals.
EOL has data for 23 attributes, including:
The environments in which many hydrozoans species are known to live. Select an environment to see its hydrozoans species checklist.