Some Hydroids (Cnidaria, Hydrozoa) from the Great Australian Bight in the collection of the South Australian Museum.

This report adds to knowledge of the shelf hydroid fauna of the Great Australian Bight. Hydroids were collected by the South Australian Museum and Department of Primary Industries of South Australia (PIRSA). Well known species are annotated, poorly known species are redescribed and four new species are described.

A new species of Gonionemus (Hydrozoa: Limnomedusae) from southern Australia.

A new species of a crawling limnomedusa belonging to the genus Gonionemus (Hydrozoa: Limnomedusae: Olindiidae) was collected from the brown alga Cystophora monilifera in an intertidal rock pool in Western Port, Victoria, Australia. The new species is described and compared with the three known species of Gonionemus. The mitochondrial DNA barcode markers cytochrome oxidase I and 16S rRNA were sequenced and compared to sequences from other olindiid species.

Two bathyal hydroids (Hydrozoa: Leptothecata) from the Southwest Indian Ocean.

Two species of hydroids were recovered from a mooring rope and experimentally deployed whale bone attached to an underwater transponder buoy at a depth of 732 m on the Coral Seamount on the Southwest Indian Ocean Ridge (41° 22.31'S, 54° 57'E) in the Southern Indian Ocean. The material was collected approximately 1,500 km south south-east of Madagascar during Voyage JC066 of the British Royal Research Ship R.