Ischnacanthiformes

例句：

1. 1. The Ischnacanthiformes are a group of primitive fish that lived in the oceansduring the Devonian period.
   Ischnacanthiformes是一群生活在二叠纪时期的原始鱼类。
2. 2. The Ischnacanthiformes werediscovered by paleontologists who werestudying the fossils of these fish.
   Ischnacanthiformes是由古生物学家发现的，他们正在研究这些鱼类的化石。
3. 3. The Ischnacanthiformes are now extinct,but their fossils can still be foundin museums around the world.
   Ischnacanthiformes现在已经灭绝了，但它们的化石仍然可以在世界各地的博物馆中找到。