conodont

• 一种已灭绝的鳗形牙形动物，生存于晚寒武世至晚三叠世，以其含有细胞骨的锥形牙齿而闻名；也指这种生物微小的化石牙齿。

A noun referring to an extinct eellike fish from the late Cambrian to late Triassic periods, known for its cone-shaped teeth containing cellular bone, or the tiny fossilized tooth of such an organism.

1. C2formalscientific

   The tiny, cone-shaped fossil tooth of an extinct primitive vertebrate belonging to the order Conodonta.

   牙形石

   • The geologist identified a conodont in the limestone sample.
   • Conodonts are used as index fossils for dating rock layers.
   • The microscopic conodont revealed details about ancient marine life.

2. C2formalscientific

   A small, extinct eel-like fish, about 2 inches long, with a finned tail and a notochord, possessing cone-shaped teeth containing cellular bone. It lived from the late Cambrian to the late Triassic period and is considered a possible predecessor of cyclostomes.

   已灭绝的鳗形鱼

   • The conodont is thought to be an early ancestor of modern lampreys.
   • Fossilized remains of the conodont show a primitive notochord structure.
   • Scientists study conodonts to understand early vertebrate evolution.