description Ichthyostega stensioei Overview
Ichthyostega stensioei was a Late Devonian vertebrate from East Greenland and one of the earliest well-known tetrapods. It combined limbs with digits and a strong ribcage with aquatic features, including a finned tail and sensory adaptations inherited from fishlike ancestors. Its anatomy indicates that early tetrapod limbs did not immediately produce modern terrestrial walking and were also used in shallow-water movement.
insights Ranking position
Ichthyostega stensioei ranks #30 of 249 in the Fossil ranking, behind Otodus megalodon (Megalodon), ahead of Sahelanthropus tchadensis (Toumai).
help Ichthyostega stensioei FAQ
Was Ichthyostega one of the first animals to walk on land?
Ichthyostega was one of the earliest well-known vertebrates with limbs and digits, but it was not simply a modern-style land walker. Its Late Devonian body retained a finned tail and other adaptations linking it strongly to water.
How many toes did Ichthyostega have?
Its hind limb had seven digits rather than the five typical of most later tetrapods. This shows that the standard five-digit limb was not fixed at the earliest stages of tetrapod evolution.
How did Ichthyostega move on land?
Its robust forelimbs and stiff trunk may have allowed it to haul or propel itself over land and in very shallow water. Anatomical studies suggest movement unlike the alternating walk of a salamander or other familiar four-legged animal.
How is Ichthyostega different from Acanthostega?
Acanthostega appears more thoroughly aquatic, with limbs poorly suited to supporting its body on land. Ichthyostega had a stronger ribcage and more robust limbs, although both retained aquatic features and came from Devonian Greenland.
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