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Agnatha
[Agnatha 词源字典]
"A group of primitive jawless vertebrates which includes the lampreys, hagfishes, and many fossil fishlike forms", From modern Latin
Agnatha
, from a-
1
'without' + Greek
gnathos
'jaw'.
[Agnatha etymology, Agnatha origin, 英语词源]
[Agnatha 词源字典]