ARTHRODIRAARTHRODIRA| Poland 1966 | Benin 1996 | Australia 1997 | Australia 2014 |
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|---|---|---|---|
| Dinichthys Dinichthys (Dinichthyidae) (ARTHRODIRA) |
Dunkleosteus Dunkleosteus (Dinichthyidae) (ARTHRODIRA) |
Mcnamaraspis Mcnamaraspis kaprios (Mcnamaraspidae) (ARTHRODIRA) |
Coccosteus Coccosteus (Coccosteidae) (ARTHRODIRA) |
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|---|---|
| Dunkleosteus(Head bone) Dunkleosteus (Dinichthyidae) (ARTHRODIRA) |
Dunkleosteus Dunkleosteus (Dinichthyidae) (ARTHRODIRA) |
In so-called armored fish, the group called the placoderm that one step evolved than agnathan had structure called the for the first time clear chin, and ecological niche called the strong flesh-eating, as a result, it attacked the other animals, and to eat was opened. Dunkleosteus reached length 9 meters depending on a kind with the largest-sized fish in that and dominated ocean ecosystem of the (from 367,000,000 years to 362,500,000 years before) in those days. It is thought that the form of the tail resembled today's shark in the recent reconstruction.
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