Actinolepidae

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Arthrodira - "Jointed Necks"
Placoderm Taxonomy Placoderm Phylogeny

Class: Placodermi
Order: ARTHRODIRA
Superfamilies:

(to be added;
ref Carroll 1988)

Placodermi
`--Actinolepidoidei (paraphyletic?) ARTHRODIRA 
   |==Actinolepidae  (paraphyletic?)
   |  `--+--Wuttagoonaspidae
   |     `--Phyllolepida
   `--+--Phlyctaenioidei
      |  |--Holonematidae
      |  `--Phlyctaeniina
      `--Brachythoraci
         |--Heterosteidae
         `--Coccosteina
            |--Buchanosteoidea
            `--+--Gemuendenaspis
               `--+--Holonematidae
                  `--+--Migmatocephalia
                     |  |--Homostiidae
                     |  `--Buchanosteidae
                     `--Eubrachythoraci
                        `--Coccosteomorphi
                           `--Pachyosteomorphi

Arthrodire topics: Taxonomy | Phylogeny | Characteristics | Ecology and Lifestyle | Links | References



Contents

Synopsis

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

Range: Early Devonian (to Middle Devonian?) of North America, Spitzbergen, Australia.

Phylogeny: Actinolepidoidei: Phyllolepididae + Actinolepida.

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

Links: Abstracts; Actinolepina after Johnson, Elliott & Wittke, 2000; 163.htm; placodermii.htm (see links to Wuttagoonaspis images); AJES_02a.pdf. (hyperlinks need to be added)

Phylogeny

Family: Actinolepidae Gross, 1940 Phylogeny after Johnson, Elliott & Wittke, 2000


<==o †Actinolepidae
  |--+-- †Bollandaspis woschmidti
  |  `--o †Actinolepis
  |     |-- †A. tuberculata
  |     `--+-- †A. magna
  |        `-- †A. spinosa
  `--+-- †Aleosteus eganensis Johnson, Elliott & Wittke, 2000
     `--+-- †Bryantolepis brachycephala 
        `--+--o †Aethaspis
           |  |-- †A. utahensis
           |  `-- †A. major
           `--+-- †Anarthraspis [Svalbardaspis]
              `--+--+-- †Simblaspis cachensis
                 |  `--+-- †Lehmanosteus hyperboreus
                 |     `-- †Sigaspis lepidophora
                 `--+--+-- †Baringaspis dineleyi
                    |  `-- †Proaethaspis ohioensis
                    `--+-- †Steurtzaspis germanica
                       `--+-- †Eskimaspis heintzi
                          `--+-- †Heightingtonaspis anglica 
                             `-- †Kujdanowiaspis


References

  • Janvier (1996) Early Vertebrates.
  • Carroll, R. L., 1988: Vertebrate Paleontology and Evolution. W. H. Freeman and company, New York, 1988, 698
  • Frickhinger, K. A., 1995: Fossil Atlas – Fishes. Mergus – Publishers for Natural History and Pet Books, Hans A. Baensch, Malle, Germany, 1-1088
  • Johnson, H. G., Elliott, D. K. & Wittke, J. H., 2000: A new actinolepid arthrodire (Class Placodermi) from the Lower Devonian Sevy Dolomite, East-Central Nevada. Zoological Journal of the Linnean Society: Vol. 129, #2?, pp. 241-266


Credits

Synposis ATW011014 Palaeos com, public domain. Phylogenetic tree © Mikko Haaramo, Mikko's Phylogeny Archive

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