Palaeonisciformes

例句：

1. 1.Palaeonisciformes area group of extinct marine reptilesthat lived during the Cretaceousperiod.
   白垩纪鱼龙目是一组已灭绝的海洋爬行动物，生活在白垩纪时期。
2. 2. The discoveryof these creatures has helpedscientists understand more about the evolutionof life on Earth.
   这些生物的发现有助于科学家更深入地了解地球上生命演化的过程。
3. 3. Palaeonisciformes were once common in the oceans, but their fossils have been foundin many parts of the world.
   白垩纪鱼龙目曾经广泛存在于海洋中，它们的化石在世界许多地方都有发现。