According to the Atlas of Living Australia, at least 48 species of sea stars have been recorded in South Australian waters.
As of 20 June 2019, photographs of 29 of these species can be found in the Seastars of South Australia project on iNaturalist.
| Genus | Species | Common name | Described |
| Allostichaster | polyplax | Seastar | 1844, Müller & Troschel |
| Anthaster | valvulatus | 1843, Müller & Troschel | |
| Aquilonastra | scobinata | Seastar | 1933, Livingstone |
| Astropecten | priessi | 1843, Müller & Troschel | |
| Astropecten | triseriatus | Starfish | 1843, Müller & Troschel |
| Astropecten | vappa | 1843, Müller & Troschel | |
| Bollonaster | pectinatus | 1883, Sladen | |
| Ceramaster | patagonicus | 1889, Sladen | |
| Coscinasterias | calamaria | 1840, Gray | |
| Coscinasterias | muricata | Eleven-armed seastar | 1867, Verrill |
| Echinaster | arcystatus | 1914, H.L. Clark | |
| Echinaster | glomeratus | 1916, H.L. Clark | |
| Fromia | polypora | 1916, H.L. Clark | |
| Henricia | compacta | 1889, Sladen | |
| Luidia | australiae | 1920, Döderlein | |
| Mediaster | australiensis | Starfish | 1916, H. L. Clark |
| Meridiastra | atyphoida | Seastar | 1916, H. L. Clark |
| Meridiastra | calcar | Eight-armed cushion star | 1816, Lamarck |
| Meridiastra | fissura | Seastar | 2002, O’Loughlin |
| Meridiastra | gunnii | Seastar | 1840, Gray |
| Meridiastra | medius | Seastar | 2003, O’Loughlin, Waters & Roy |
| Meridiastra | nigranota | 2002, O’Loughlin | |
| Meridiastra | occidens | Seastar | 2003, O’Loughlin, Waters & Roy |
| Meridiastra | oriens | Seastar | 2003, O’Loughlin, Waters & Roy |
| Nectria | macrobrachia | Seastar | 1923, H. L. Clark |
| Nectria | multispina | Seastar | 1928, H. L. Clark |
| Nectria | ocellata | Seastar | 1876, Perrier |
| Nectria | pedicelligera | Seastar | 1925, Mortensen |
| Nectria | saoria | 1967, Shepherd | |
| Nectria | wilsoni | 1965, Shepherd & Hodgkin | |
| Paranepanthia | grandis | Seastar | 1928, Clark |
| Parvulastra | exigua | Dwarf cushion star | 1816, Lamarck |
| Parvulastra | parvivipara | 1978, Keough & Dartnall | |
| Pentagonaster | duebeni | Vermillion seastar | 1847, Gray |
| Petricia | vernicina | Velvet seastar | 1816, Lamarck |
| Plectaster | decanus | Mosaic seastar | 1843, Müller & Troschel |
| Pseudonepanthia | troughtoni | Seastar | 1934, Livingstone |
| Pseudophidiaster | rhysus | Starfish | 1916, H.L. Clark |
| Psilaster | acuminatus | 1889, Sladen | |
| Sclerasterias | dubia | 1909, H.L. Clark | |
| Smilasterias | irregularis | Seastar | 1928, H. L. Clark |
| Stellaster | equestris | 1805, Retzius | |
| Tosia | australis | Biscuit star | 1840, Gray |
| Tosia | magnifica | Magnificent biscuit star | 1842, Müller & Troschel |
| Tosia | neossia | Biscuit star | 2009, Naughton & O’Hara |
| Uniophora | granifera | Five-armed seastar | 1816, Lamarck |
| Uniophora | nuda | 1875, Perrier | |
| Zoroaster | macracantha | 1916, H.L. Clark |
Revision log
- 4 December 2017 – Dan Monceaux (completed ALA links and expanded list with multiple genera)
- 20 June 2019 – Dan Monceaux (added sentence about iNat observations and outbound link)
Hello, Recently starfish have started appearing on the lakes edge at semaphore park. I have lived in the area 6 years and have not observed them until the last month or so. Today spotted twelve in around 100 metres. I am wondering if they are an invasive species that should be reported, I have a photograph but do not know who to approach? Cheers, jerusha
Hi Jerusha, thanks for reporting your sightings to us. It is not unusual to find starfish in the lake, but large numbers of them or the sudden appearance of certain species is of great interest. Would you please send us some of your photos for ID purposes? Cheers,Steve