Jawless, bloodsucking fish could help us understand how humans and all other vertebrates evolved, scientists say. Turns out, lampreys — notable for their lack of jaw and generally terrifying ...

The most ancient fish were jawless, and since our whole group has jaws, we can safely choose a jawless fish as a fairly recent ancestor. Unfortunately, this ancestor is long dead. To compare ...

cartilaginous fish, Chondrichthyes; and jawless fish, Agnatha. The discipline can include the biology, taxonomy and conservation of fish, as well as husbandry and commercial fisheries.