OSTEOLEPIFORMESOSTEOLEPIFORMES| Poland 1966 |
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| Eusthenopteron Eusthenopteron (Tristichopteridae) |
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| Eusthenopteron Eusthenopteron (Tristichopteridae) (OSTEOLEPIFORMES) |
Osteplepiformes is the Teleostei which appeared with a fish equal to the ancestor of Coelacanthiformes and Ichthyostegalia at the middle in Devonian period. The body is slim, and the scale is thick with a lozenge, and the fin has shape that it seems to be a leaf. Eusthenopteron is fish itself on appearance, but a fin has a bone unlike a common fish. Because Eusthenopteron pushes a plant aside with a fin as for this reason in a riverbed with many plants, and it swam, the reason is because the fin which is sturdiness with the bone was necessary. It leads to an animal to enter the land by making a bone in this fin. In addition, they are friends of a dipnoan fish doing pulmonary respiration.
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