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Five of the most completely known are the osteolepiform Eusthenopteron; the transitional forms Panderichthys and Tiktaalik; and the primitive tetrapods Acanthostega and Ichthyostega.
Juvenile specimens of Eusthenopteron foordi Whiteaves, 1881 (osteolepiform rhipidistian, Pisces) from the Late Devonian of Miguasha, Quebec, Canada.
Panderichthys provides incontrovertible evidence of a transitional form between osteolepiform fishes and tetrapods.
The pattern of internal structure of the osteolepiform limb as in
It would also be a mistake to exaggerate the extent to which osteolepiform fishes actually used their fins as arms and legs; the fins in the forms that we know are all small and feeble