Related: "Bloodsucking Lamprey Found to Be 'Living Fossil.'"
2
本文对五条日本七鳃鳗腮囊的形态结构进行了比较详细的观察。
The forms and structures of gill pouch in five Lampetra japonicas were observed in detail.
3
其结果表明：日本七鳃鳗的腮囊有七对，囊壁向内折叠形成腮叶及次级腮叶。
The results indicate that there are seven pairs of gill pouches in Lampetra japonica (Martens). The wall of gill pouch folding inward forms gill-lobes and secondary gill lobe.
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