neoteinia

例句：

1. 1.The Neoteetina is a species of fish that has been extinct for millions of years.
   新鳍鱼纲是一种已经灭绝了数百万年的鱼类。
2. 2. The Neoteetina was discovered in the 19th century by a scientist who believed it had evolved from a more primitive form.
   新鳍鱼纲是在19世纪由一位科学家发现的，他认为它是由一种更原始的形式进化而来的。
3. 3. The Neoteetina's unique features make it an important model for studying evolution.
   新鳍鱼纲的独特特征使其成为研究进化的重要模型。