| 单词 | Arthrodira | 
| 释义 | Arthrodiraplural noun  Ar·thro·di·ra     : a group of Devonian fishes forming a subclass of Placodermi or especially formerly an order of Ostracodermi or a separate class and having the forepart of the body protected by bony plates and with an imperfectly ossified internal skeleton   see coccosteidae , dinichthys    arthrodiran   ¦⸗⸗¦dīrən   arthrodire   ˈ⸗⸗ˌdī(ə)r   plural -s   arthrodirous   -¦dīrəs   | 
	
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