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Abbreviated Dendrogram
Gnathostomata
│ └─Acanthodii etc (if traditional placement)
│
└─Placodermi
╞?═Acanthothoraci
├─Rhenanida
└─┬─Antiarchi
└─┬─┬─Petalichthyida
│ └─Ptyctodontida
└─┬─┬─Arthrodira
? ├─Actinolepidoidei
│ │ ├─Actinolepida
│ │ └─Phyllolepida
│ └─┬─Phlyctaenioidei
│ └─┬─Brachythoraci
│ └─┬─Coccosteomorphi
│ └─┬─Pachyosteomorphi
│ └─Aspinothoracidi
╘═Acanthodii
├─Chondrichthyes
└─Osteichthyes
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Contents
Overview |
lwD-upD.
Peak(?) of nuchal plate near geometric center; ornamented with concentric ridges.
References: Janvier (1996).
Actinolepida = Actinolepina): Actinolepis, Sigaspis, Simblaspis, Wuttagoonaspis
lwD(-mD?) of NAm, Spitzbergen, Aus.
radiation center of paranuchal plate near topographic center; elongated thoracic armor; spinal plates long & frequently ornamented with tubercles in concentric pattern.
011014.
checked ATW0151003; new page MAK111024