Genus
Ichthyostega Säve-Söderbergh, 1932
Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Chordata |
| Subphylum | Vertebrata |
| Organism group | Gnathostomata |
| Superclass | Osteichthyes |
| Class | Sarcopterygii |
| Subclass | Rhipidistia |
| Tetrapodomorpha | |
| Family | Stegocephalia |
| Genus | Ichthyostega |
| Tiktaalik |