七鳃鳗，八目鳗一种七鳃鳗科的原始细长淡水或溯河产卵鱼，特点是长有无。
Any of various primitive elongated freshwater or anadromous fishes of the family Petromyzontidae, characteristically having a jawless sucking mouth with rasping teeth.
蛇鳗科鱼类广布于各大洋的热带和亚热带大陆架水域，可依靠尖突的头部和尖秃骨化的尾端在沙土或珊瑚礁后潜穴。
Distributed in continental shelf depths of all tropica and subtropical oceans, Ophichthidae can burrow in sand and mud substrates or coral reefs by pointed rayless tail tips or acute snouts.
蛇鳗科鱼类广布于各大洋的热带和亚热带大陆架水域，可依靠尖突的头部和尖秃骨化的尾端在沙土或珊瑚礁后潜穴。
Distributed in continental shelf depths of all tropica and subtropical oceans, Ophichthidae can burrow in sand and mud substrates or coral reefs by pointed rayless tail tips or acute snouts.
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