Organism comparisons 

Skeletal comparisons are often used as evidence for possible lineages.

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).
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