1. The subungulates are a diverse group of animals that include tapirs, rhinoceroses, and some extinct species.

亚蹄类动物是一个多样化的动物群，包括貘、犀牛和一些已经灭绝的物种。

2. The presence of primitive teeth in subungulates suggests that they may be ancestral to the modern ungulates.

亚蹄类动物身上原始的牙齿表明它们可能是现代有蹄类动物的祖先。