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Dartmuthia
''Dartmuthia'' is an extinct genus of primitive jawless fish that lived in the Silurian period in what is now Estonia. To date only the creature's armored head shield (a typical trait for osteostracids) has been found. Since the mouth is positioned on the underside of the head ''Dartmuthia'' is presumed to have dwelled on the ocean floor, sucking its food into its mouth. ==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Dartmuthia」の詳細全文を読む
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