At any stage, you can move up or down the Taxonomic hierachy of Antarctic/subantarctic species by clicking on any name. Lower level taxon counts are shown in [].
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| Kingdom | Animalia | |
| Phylum | Echinodermata | |
| Class | Echinoidea | |
| Order | Cassiduloida | |
| Family | Euchinoidea |
List of all species - see Taxon profile using the number
| Genus Abatus | ||||
| Abatus cordatus | (Verrill, 1876) | |||
| Genus Hemiaster | ||||
| Hemiaster cavernosus | A.Agassiz | |||
| Genus Pourtalesia | ||||
| Pourtalesia carinata | A.Agassiz | |||
| Pourtalesia ceratopyga | A.Agassiz | |||