At that time, jawless fish filled the seas, while jawed vertebrates were uncommon. Today, the opposite is true. Lampreys and ...

Lampreys are another form of ancient, blood-sucking, jawless fish also still in existence today. These findings show that both the hagfish and lamprey evolved their eel-like body form and strange ...

The fish also had four or five “branchial slime pores,” according to the study, double what other species have. The roughly foot-long sea creature is a new species, and was na ...