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1.extinct order of jawless vertebrates.
已经灭绝的无颚脊椎动物目。收藏指正
2.primitive jawless aquatic vertebrate: lampreys; hagfishes.
原始的无颚脊椎动物；七鳃鳗；八目鳗类鱼。收藏指正
3.extinct group of armored jawless vertebrates; taxonomy is not clear.
一种已灭绝的无下巴甲壳脊椎动物；其分类尚不明确。收藏指正
4.extinct fishlike jawless vertebrate having a heavily armored body; of the Paleozoic.
已经灭绝的长有很重披甲的鱼形无颚动物；古生代的生物。收藏指正
5.extinct group of armored jawless fishes or fishlike vertebrate; taxonomy is not clear.
现已灭绝的无颚有甲鱼类或鱼状脊椎动物；其分类尚不明确。收藏指正
6.a group of vertebrates comprising both cartilaginous and bony fishes and sometimes including the jawless vertebrates; not used technically.
包括软骨和多骨鱼类脊椎动物，有时包括无下颌的脊椎动物；不用于学术上。收藏指正
7.Any of various primitive elongated freshwater or anadromous fishes of the family Petromyzontidae, characteristically having a jawless sucking mouth with rasping teeth.
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，特点是长有无颌的吮吸嘴，嘴内有锉牙收藏指正
8.Any of various primitive, eel-shaped marine fishes of the family Myxinidae, having a jawless sucking mouth equipped with rasping teeth with which they bore into and feed on other fishes.
盲鳗一种盲鳗科的原始的鳗形海洋鱼种。有一个无颌的吸嘴，嘴里有锉齿，盲鳗用这种牙齿能刺入其它鱼类的身体并以它们为食收藏指正
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