Skeletal comparisons are often used as evidence for possible
Top amd left top view are representations of Eusthenopteron
Bottom and right top view are Icthyostegalia skulls
The skeletons of crossopterygians and amphibians put up
a convincing arguement for there relation when they are compared.
Comparison between a crossopterygian,
(an Eusthenopteron), and a primitive amphibian, (bottom).