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Abbreviated Dendrogram
Gnathostomata
│ └─Acanthodii etc (if traditional placement)
│
└─Placodermi
╞?═Acanthothoraci
├─Rhenanida
└─┬─Antiarchi
└─┬─┬─Petalichthyida
│ └─Ptyctodontida
└─┬─┬─Arthrodira
? ├─Actinolepidoidei
│ └─┬─Phlyctaenioidei
│ └─┬─Brachythoraci
│ └─┬─Coccosteomorphi
│ └─┬─Pachyosteomorphi
│ └─Aspinothoracidi
╘═Acanthodii
├─Chondrichthyes
└─Osteichthyes
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