Dichotomous Key/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