1、
Extinct group of armored jawless fishes or fishlike vertebrate; taxonomy is not clear.
原始的无颚脊椎动物；七鳃鳗；八目鳗类鱼。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。
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2、
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。
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