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 | Chromista | |
| Phylum | Ochrophyta | |
| Class | Coscinodiscophyceae | |
| Order | Coscinodiscales | |
| Family | Hemidiscaceae |
List of all species - see Taxon profile using the number
| Genus Actinocyclus | ||||
| Actinocyclus actinochilus | (Ehrenb.) Simonsen, 1982 | |||
| Actinocyclus adeliae | Manguin, 1957 | |||
| Actinocyclus cholnokyi | Van Landingham 1967 | |||
| Actinocyclus curvatulus | Janisch, 1878 | |||
| Actinocyclus dimorphus | ||||
| Actinocyclus divisus | (Grunow) Hust., 1958 | |||
| Actinocyclus ehrenbergii | Ralfs in Pritchard 1861 | |||
| Actinocyclus ehrenbergii var. asteriscus | ||||
| Actinocyclus exiguus | Fyxell & Semina, 1981 | |||
| Actinocyclus hookeri | ||||
| Actinocyclus ingens | ||||
| Actinocyclus karsteni | Van Heurck 1909 | |||
| Actinocyclus normanni | (Gregory) Hustedt 1957 | |||
| Actinocyclus octonarius | (Ehrenb.) Ehrenb., 1838 | |||
| Actinocyclus sp. | ||||
| Actinocyclus spiritus | Watkins, 1986 | |||
| Actinocyclus undulatus | J.W. Bailey, 1842 | |||
| Genus Charcotia | ||||
| Charcotia actinochilus | (Ehrenberg) Hustedt 1958 | |||
| Charcotia australis | (Karsten) M. Peragallo 1921 | |||
| Charcotia irregularis | (Van Heurck) M. Peragallo 1921 | |||
| Genus Hemidiscus | ||||
| Hemidiscus karstenii | ||||
| Hemidiscus ovalis | (R. Gersonde) D. M. Harwood & T. Maruyama | |||