In A split for the long custom of grouping all fish into an individual course (Pisces), present day phylogenetics views fish as a paraphyletic group. 知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 Cartilaginous fish belong to the class Chondrichthyes. Cartilaginous fish have skeletons manufactured from cartilage – a clean, flexible tissue – as opposed https://maps.app.goo.gl/kTisAZCbSjAw6nkX8