Vertebrata Cuvier, 1812 - vertebrates Class Agnatha Cope, 1889 [paraphyletic] Subclass †Pteraspidomorphi Goodrich, 1909 see Class Pteraspidomorphi Goodrich, 1909 Order †Heterostraci Lankester, 1868 - heterostracans see Subclass Heterostraci Lankester, 1868 ?Family †Arandaspididae Ritchie & Gilbert-Tomlinson, 1977 Genus †Arandaspis Ritchie & Gilbert-Tomlinson, 1977