References in periodicals archive ?
Today, the only jawless vertebrates are lampreys and hagfishes, whereas jawed vertebrates number more than fifty thousand species, including ourselves.
New Silurian and Devonian fork-tailed 'thelodonts' are jawless vertebrates with stomachs and deep bodies.
Litman next plans to look for novel immune genes in jawless vertebrates, such as lamprey and hagfish.
Between jawless vertebrates -- called agnathans -- and vertebrates with jaws-called gnathosomes-only three genes of the 12 genes the team looked at appeared to be used differently, Medeiros said.