Four Cnidarian Classes
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Cnidaria divides into four classes: Anthozoa, polyp-only, including corals; Scyphozoa, true jellyfish; Cubozoa, box jellyfish; and Hydrozoa, a varied group.
Show
A reef-building coral is an anthozoan colony of polyps; a box jellyfish, a cubozoan, carries venom potent enough to matter medically.
Watch for
Cubozoan venom potency varies sharply by species — not every box jellyfish poses the danger a few species do.