出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/26 04:23 UTC 版)
Hagfish are marine craniates of the class Agnatha or Myxini, also known as Hyperotreti. Some researchers regard Myxini as not belonging to the subphylum Vertebrata. That is, they are the only living animals that have a skull but not a vertebral column.
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