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 (92%) attach to temperate algae; the remaining, the others to coral rock. This is a list of hydroids of the Houtman Abrolhos:
Anthoathecatae Corynidae Sarsia eximia Candelabridae Candelabrum harrisoni Eudendriidae Eudendrium ?minutum Cytaeididae ?Perarella sp.
Leptothecatae Campanulariidae Campanularia delicata Orthopyxis gaussica Paracalix ambiplica Obelia sp. Haleciidae Halecium delicatulum Halecium dyssymetrum Halecium pearsonense Halecium nanum Hydrodendron armatum Hydrodendron australe Thyroscyphidae Thyroscyphus macrocytharusSertulariidae Salacia desmoides Amphisbetia minuta Dynamena quadridentata Sertularia turbinata Calamphora campanulata Halopterididae Gattya trebilcocki Antennella secundaria Halopteris everta Halopteris diaphana Kirchenpaueriidae Pycnotheca producta Kirchenpaueria sp.Plumulariidae Monotheca obliqua Monotheca spinulosa Monotheca hyalina Dentitheca alata Plumularia setaceoides Plumularia filicaulis Aglaopheniidae Aglaophenia pseudoplumosa Aglaophenia sp. Macrorhynchia filamentosa Macrorhynchia philippina Gymnangium furcatum Gymnangium gracilicaule
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