Ichthyodea

例句：

1. 1. The fish scales are a valuable resource for scientists to study the behavior of marine life.
   鱼鳞是科学家研究海洋生物行为的重要资源。
2. 2. The gill plates are essential for the fish to breathe underwater.
   鳃片对于鱼类在水下呼吸至关重要。
3. 3. The Ichthyodea is a group of fish with unique adaptations that allow them to live in freshwater environments.
   鱼鳞目是一种具有独特适应特征的鱼类，使它们能够在淡水环境中生存。