Page "Ichthyostega" Paragraph 5

The genus is closely related to Acanthostega gunnari, also from East Greenland.

Ichthyostegas skull seems more fish-like than that of Acanthostega, but its girdle ( shoulder and hip ) morphology seems stronger and better adapted to land-life.

Ichthyostega also had more supportive ribs and stronger vertebrae with more developed zygapophyses.

Whether these traits were independently evolved in Ichthyostega is debated.

It does however show that Ichthyostega clearly ventured onto land on occasions, unlike the very first tetrapods like Elginerpeton and Obruchevichthys.