菊石

The ammonoids were a highly diverse and successful group of marine creatures in the Mesozoic era.
钋角类在中生代是一群高度多样且成功的海洋生物。
Their spiral-shaped shells, called ammonite, are commonly found as fossils.
它们螺旋形的壳，即所谓的钋化石，常见于化石中。
Ammonoids are extinct cephalopods related to modern-day octopuses and squids.
钋角类是已灭绝的头足类动物，与现代的章鱼和乌贼有亲缘关系。
The study of ammonoid fossils has helped paleontologists understand ancient ocean ecosystems.
对钋角类化石的研究帮助古生物学家理解古代海洋生态系统。
Some ammonoids had intricate patterns on their shells, which scientists use to classify them.
一些钋角类的壳上有复杂的图案，科学家利用这些图案对它们进行分类。
The extinction event at the end of the Cretaceous period spelled the end for ammonoids.
白垩纪末期的灭绝事件标志着钋角类的终结。
Ammonoid shells varied greatly in size, from a few centimeters to over a meter in diameter.
钋角类的壳大小不一，从几厘米到超过一米的直径都有。
They played a crucial role in the food chain, being both predators and prey.
它们在食物链中扮演着关键角色，既是捕食者也是猎物。
Fossilized ammonoids can provide insights into the evolution and biogeography of marine life.
化石化的钋角类可以提供海洋生物进化和生物地理学的洞见。
The chambered structure of ammonoid shells allowed them to control their buoyancy in the water column.
钋角类壳的分室结构使它们能够在水柱中控制浮力。