Haisheng of bivalves, an important member of the from the Triassic to Jurassic little change. sea urchins from the beginning of the Jurassic occupy an important position.

• 海生的菊石、双壳类、箭石仍为重要成员，六射珊瑚从三叠纪到侏罗纪的变化很小。棘皮动物的海胆自侏罗纪开始占据了重要地位。