Palaeos:		Placodermi
The Vertebrates		Actinolepidoidei

Actinolepidoidei

Gnathostomata
|  `--Acanthodii etc (if traditional placement)
|
Placodermi
  |?==Acanthothoraci
  |--Rhenanida
  `--+--Antiarchi
     `--+--+--Petalichthyida
        |  `--Ptyctodontida
        `--+--Arthrodira
           ?  |--Actinolepidoidei
           |   |  |--Actinolepida
           |   |  `--Phyllolepida
           |   `--+--Phlyctaenioidei
           |      `--+--Brachythoraci
           |         `--+--Coccosteomorphi
           |            `--+--Pachyosteomorphi
           |               `--Aspinothoracidi
           `==Acanthodii
              |--Chondrichthyes
              `--Osteichthyes

Taxa on This Page

1. Actinolepida X
2. Actinolepidoidei X

Descriptions

Actinolepidoidei: 

Range: lwD-upD.

Phylogeny: Arthrodira: Phlyctaenioidei + *: Actinolepida + Phyllolepida.

Characters: Peak(?) of nuchal plate near geometric center; ornamented with concentric ridges.

References: Janvier (1996).

Actinolepida (= Actinolepina): Actinolepis, Sigaspis, Simblaspis, Wuttagoonaspis

Range: lwD(-mD?) of NAm, Spitzbergen, Aus.

Phylogeny: Actinolepidoidei: Phyllolepidae + *.

Characters: radiation center of paranuchal plate near topographic center; elongated thoracic armor; spinal plates long & frequently ornamented with tubercles in concentric pattern.

Links: Actinolepidae.

References: Janvier (1996). 011014.