29.2: Fishes Last updated Save as PDF Page ID 13906 Boundless Boundless 29.2A: Agnathans- Jawless Fishes 29.2B: Gnathostomes - Jawed Fishes Gnathostomes, jawed vertebrates, can be divided into two types of fish: Chondrichthyes (cartilaginous fish) or Osteichthyes (bony fish).