List of hydroids of the Houtman Abrolhos
A total of 38 hydroid species have been collected at the Houtman Abrolhos. 34 of these are leptothecates, the remainder being anthoathecates. 35 of them attach to temperate algae; the remaining, the others to coral rock. This is a list of hydroids of the Houtman Abrolhos:;Corynidae
;Candelabridae
;Eudendriidae
;Cytaeididae