多种相关的细长软体小动物，特别是环虫类、毛颚类、线虫类和扁形虫类；也包括许多昆虫的幼虫。

Any of numerous relatively small elongated soft-bodied animals especially of the phyla annelida and chaetognatha and nematoda and nemertea and platyhelminthes; also many insect larvae.

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让赖歇特感到吃惊的是，他发现哺乳类的两块耳骨与爬行类颚部的一些骨片相吻合。

He was astonished to find that two of the ear bones in mammals corresponded to pieces of the jaw in reptiles.

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舒宾写道：“结论不可避免：构成爬行类颚部一部分的鳃弓，同样也构成了哺乳类的耳骨。”

Shubin writes: "the conclusion was inescapable: the same gill arch that formed part of the jaw of a reptile formed ear bones in mammals."

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