1. Cephalon (plural Cephalons) The head of a trilobite

2. Cephalon (plural Cephalons) (zoology) The head of a trilobite.

3. The most recently recognized of the nine trilobite orders, Harpetida, was erected in 2002.

4. Brachiopod, trilobite, coral, ostracod and other invertebrate shell debris is present in many Coquinas.

5. In all other cases in which trilobite Biramous appendages have been reported variations among serial Biramous appendages are generally viewed to be minor and unworthy of designation as distinct tagma