Project 706: J. A. Long, G. C. Young, T. Holland, T. J. Senden, E. M. G. Fitzgerald. 2006. An exceptional Devonian fish from Australia sheds light on tetrapod origins. Nature. 444 (7116):199-202.
Specimen: † Gogonasus andrewsae (MV/P:221807)
View: skull, lateral

Abstract

The transition from fishes to tetrapods was one of the most dramatic events in the evolution of vertebrates, but many pivotal fossils are incomplete, resulting in gaps in the data that are used for phylogenetic reconstruction. Here we present new observations from the most complete, acid-prepared Devonian tetrapodomorph fish yet discovered, Gogonasus1, 2, which was previously placed just crownward of Kenichthys and rhizodontids3, 4, the most primitive taxa on the tetrapod lineage. Unexpectedly, Gogonasus shows a mosaic of plesiomorphic and derived tetrapod-like features. Whereas the braincase and dermal cranial skeleton exhibit generalized morphologies with respect to Eusthenopteron5 or Panderichthys6, taxa that are traditionally considered to be phyletically close to tetrapods7, 8, the presence of a deeply invaginated, wide spiracle, advanced internal spiracular architecture and near-horizontal hyomandibula are specialized features that are absent from Eusthenopteron9. Furthermore, the pectoral fin skeleton of Gogonasus shares several features with that of Tiktaalik, the most tetrapod-like fish10. A new phylogenetic analysis places Gogonasus crownward of Eusthenopteron as the sister taxon to the Elpistostegalia. Aspects of the basic tetrapod limb skeleton and middle ear architecture can now be traced further back within the tetrapodomorph radiation.


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Project DOI: 10.7934/P706, http://dx.doi.org/10.7934/P706
This project containsMatrices
  • 3 Media
  • 1 Matrix
  • 1 Document
  • 10 Taxa
  • 1 Specimen
  • 114 Characters
Total size of project's media files: 3 MB

Download Project SDD File
Total scored cells: 953
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 114
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 252
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:114/0
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MorphoBank Project 706


    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    MorphoBank Curator
    Project Administrator
    Last logged in 06/25/13
    101311400953
    (933, 0, 20)
    000
    Maureen Admin
    Full membership
    Last logged in 06/24/13
    0000000
    (0, 0, 0)
    000
    John Long
    Full membership
    Last logged in 10/01/12
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M1622' (9 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] † Glyptolepis
    Last Modified in 12/05/13
    13979704003
    [2] † Eusthenopteron
    Last Modified in 12/05/13
    011411400003
    [3] † Barameda
    Last Modified in 12/05/13
    1010410400003
    [4] † Panderichthys
    Last Modified in 12/05/13
    311011001003
    [5] † Acanthostega
    Last Modified in 12/05/13
    610310305003
    [6] † Ichthyostega
    Last Modified in 12/05/13
    810110105003
    [7] † Tiktaalik
    Last Modified in 12/05/13
    1310010001003
    [8] † Gogonasus
    Last Modified in 12/05/13
    011411400003
    [9] † Onychodus
    Last Modified in 12/05/13
    20909004003


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views22645
    Project overview2830
    Media views5306Media search (3725 views); M107286 (501 views); M107287 (541 views); M107285 (539 views);
    Matrix views1909Matrix landing page (1686 views); Gogon Matrix (223 views);
    Views for media list1983
    Specimen list1962
    Taxon list5484
    Bibliography1629
    Documents list1542




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project141
    Matrix downloads4Gogon Matrix (4 downloads);
    Document downloads2Copyright information for exemplar media (2 downloads);
    Project downloads134
    Media downloads1M107285 (1 download);