from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An agnathan.
There is another Class of "fishes", called agnatha, which embraces the jawless fish like lampreys.
Now, agnatha is also a superclass within the sub-phylum vertebrata, so as to exclude
Super-Class fits in below Sub-Phylum and above Class, though using agnatha both as class and super-class seems to be bending the rules a bit.