In members of this genus the prostomium (head) is strongly indented between the antennae. The eversible pharynx has paragnaths, but only on the maxillary ring (closest to the jaws). This species can be distinguished from related species with care; the 3 species of Ceratonereis in southern Australia are not easy to tell apart. There are various differences in structure of the parapodia (feet) but the easiest to observe is the dorsal cirrus which in Ceratonereis australis is about 2 times as long as the parapodium; in Ceratonereis perkinsi it is 5-6 times as long as the parapodium; in Ceratonereis singularis the dorsal cirrus is about the same length as the parapodium. Body up to about 4 cm long.
Coastal bays and the continental shelf.
South-eastern Australia, south-western Australia, and north-western Australia.
Recorded in Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed