| The relationships between hagfishes, lampreys, and jawed vertebrates are one of the still-unresolved problems in craniate phylogeny. |
| At a quick glance, jawless fish such as the lamprey above don't appear to have much in common with jawed fish or any other back-boned creature. |
| One guy is tall, square jawed with even features and a full head of cutely tousled hair. |
| In contrast, people and other jawed vertebrates brandish adaptive immune systems. |
| The first jawed fish in the fossil record are the acanthodians, which first occur in the Late Silurian. |
| For example, it is possible that the brainstem reticular formation is divided into the same number of nuclei in all jawed vertebrates. |
