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ostracoderm

[古生] 甲胄鱼类

1、甲胄鱼

但是在奥陶纪、志留纪与泥盆纪地层中，却找到了与圆口类近似的化石种类，称之为甲胄鱼（Ostracoderms），在分类上另立为一纲，即甲胄鱼纲（Ostracodermi）。这类动物都没有上下颌，因此可以总称之为化石无颌类。

生物学

n.extinct fishlike jawless vertebrate having a heavily armored body; of the Paleozoic

1.
N（名词） any extinct Palaeozoic fishlike jawless vertebrate of the group Ostracodermi, characterized by a heavily armoured body 甲胄鱼

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