They belong to an ancient vertebrate lineage called Agnatha–or jawless fish. Some scientists believe that they represent the earliest group of vertebrates that is still living and can give us an ...
Mouth of a lamprey - Image Wikimedia Lampreys belong to a lineage of vertebrates called Agnatha, or jawless fish, which dates back about 360 million years. These "living fossils" provide a window ...
Ichthyology is the branch of zoology devoted to the study of fish, including: bony fish, Osteichthyes; cartilaginous fish, Chondrichthyes; and jawless fish, Agnatha. The discipline can include the ...