Agnatha Fossil range: Early Cambrian - Recent Scientific classificationKingdom: Animalia Phylum: Chordata Subphylum: Vertebrata Superclass: Agnatha GroupsMyxini (hagfish) Hyperoartia: Petromyzontidae (lampreys) Pteraspidomorphi Thelodonti Anaspida Cephalaspidomorphi: Galeaspida, Pituriaspida, Osteostraci
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