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This is apparent from anatomical and biochemical similarities, but, moreover, transitional fossils, such as Permotanyderus and Choristotanyderus, have been discovered to lie between the Mecoptera and Diptera.
The Darwin fish bears a stylized resemblance to Ichthyostega, which is a major example of a transitional fossil.
In other words, Puijila is a transitional fossil that provides information about how the seal family returned to the seas, similar to the way that Archaeopteryx illuminates the origin of modern birds.