conodont

n.[古生]牙形刺,牙形石

奇具齿；齿形动物

名词

1、Conodonts are tiny, extinct, eel-like creatures with vertebrate micronatures believed to have lived from the Late Cambrian to the Early Triassic periods.
奇具齿是一种类似鳗鱼的微小、灭绝的生物，其脊椎微齿化石被认为存在于晚寒武纪至早三叠纪时期。

2、Scientists have used conodonts to study ancient marine environments and to date rock formations.
科学家们以奇具齿作为研究古代海洋环境和地层年代的工具。