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 Major Groups | Cnidaria (hydra, jelly fish) | Hydrozoa (hydra, jellyfish)

Note: This key is adapted from the USA, there is no Australian key.
Key from Pennak 1989, Williams 1980

 
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1. Sessile solitary polyps with tentacles
Distribution: Australia wide
 More ››› Hydridae  

 

 
 

 

-Sessile colonial polyps with tentacles OR free swimming medusae OR sessile hydroids without tentacles
 More ››› 2  

 

 
Clavidae 

sessile colonial polyps

Olindiidae 

free swimming medusa

Olindiidae 

free swimming medusa

Olindiidae 

hydroid, no tentacles