Like Psarolepis and other sarcopterygian fishes (including Latimeria, the living coelacanth), the braincase of Guiyu is divided into separate front and rear units.

• 和斑鳞鱼及许多其它的肉鳍鱼类（包括拉蒂迈鱼，现生空棘鱼）一样，鬼鱼的脑颅也分为前后两个部分。