caryotheca

例句：

1. 1.The caryotheca of the dinosaurs is still a mystery to scientists.
   恐龙的化石仍然是一个科学家的谜。
2. 2. The discovery of the caryotheca has sparked new research in paleontology.
   恐龙化石的发现激发了古生物学的新研究。
3. 3. The caryotheca from the site is being studied for its potential as an archaeological artifact.
   该遗址出土的化石正被研究，以确定其作为考古文物的潜在价值。