The tail is to a fish as the rudder is to a ship.
尾对于鱼来说恰如舵对于船。
Lembus Rudder fish:兰勃舵鱼
仑氏缝法 Lembert's suture | 兰勃舵鱼 Lembus Rudder fish | 神经膜胚细胞 lemmoblast