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Class of coelenterates with two phases, sessile hydroids and medusa, generally occurring as different stages of the life cycle.

The following taxa of this class occur in the region:

Order Hydroida (Hydroids)
Order Milliporina (Fire corals)
Order Stylasterina (Lace corals)
Millepora alcicornis (Branching fire coral)
Millepora complanata (Blade fire coral)
Millepora squarrosa (Box fire coral)
Stylaster roseus (Rose lace-coral)

Hydrozoans (Class Hydrozoa)