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Dichotomous Key/Cnidaria
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Cnidaria Animalia Animalia Cnidaria Cnidaria
Key to Cnidaria
1: Medusa stage present.
2: Medusa stage absent.
1: Medusozoa
incomplete
Cubozoa
Hydrozoa
Polypodiozoa
Scyphozoa
Staurozoa
2
3: Parasitic
4: Non-parasitic. Corals and sea anemonies.
3
incomplete
Polypodium hydriforme: Intracellular cnidarian parasite. Parasite of sturgeon eggs.
Myxozoa
4
Hexacorallia: Polyps have 6-fold symmetry
Octocorallia: Polyps have 8-fold symmetry
5