Project 721: S. Turner,C. J. Burrow,H.-P. Schultze,A. Blieck,W.-E. Reif,P. Bultynck,C. B. Rexroad,G. S. Nowlan. 2010. False teeth: conodont-vertebrate phylogenetic relationships revisited. Geodiversitas. 32 (4):545-594.
Specimen: † Polygnathus linguiformis (IRScNB:b5177)

Abstract

An evidence-based reassessment of the phylogenetic relationships of cono- donts shows that they are not “stem” gnathostomes, nor vertebrates, and not even craniates. A significant group of conodont workers have proposed or accepted a craniate designation for the conodont animal, an interpretation that is increasingly becoming established as accepted “fact”. Against this prevailing trend, our conclusion is based on a revised analysis of traditional morphological features of both discrete conodont elements and apparatuses, histological investigation and a revised cladistic analysis modifying that used in the keystone publication promoted as proof of the hypothesis that cono- donts are vertebrates. Our study suggests that conodonts possibly were not even chordates but demonstration of this is beyond the scope of this paper. To summarize, in conodonts there is low cephalization; presence of simple V-shaped trunk musculature and unique large-crystal albid material in the elements; lack of a dermal skeleton including characteristic vertebrate hard tissues of bone, dentine and enamel; lack of odontodes with bone of attach- ment and a unique pulp system; lack of segmentally-arranged paraxial ele- ments and dermal elements in median fins, all of which supports neither a vertebrate nor a craniate relationship for conodonts.


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Project DOI: 10.7934/P721, http://dx.doi.org/10.7934/P721
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 20 Taxa
  • 1 Specimen
  • 68 Characters
Total size of project's media files: 8 MB

Download Project SDD File
Total scored cells: 924
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 68
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 151
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:68/0
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MorphoBank Project 721


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    (scored, NPA, "-")
    cell
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    MorphoBank Curator
    Project Administrator
    Last logged in 03/28/14
    20116800924
    (924, 0, 0)
    000
    Maureen Admin
    Full membership
    Last logged in 05/20/16
    0000000
    (0, 0, 0)
    000
    Pierre Bultynck
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
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    Carole Burrow
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
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    Sue Turner
    Full membership
    Last logged in Never
    0000000
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    Taxonomic Overview for Matrix 'M1650' (19 Taxa)

    taxon unscored
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    NPA
    cells
    "-" cellscell images labels on
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    [1] Tunicata
    Last Modified in 12/05/13
    5636300005
    [2] Cephalochordata
    Last Modified in 05/20/16
    0686800005
    [3] † Myxinoidea
    Last Modified in 05/20/16
    0716800005
    [4] Petromyzontida
    Last Modified in 05/20/16
    0686800005
    [5] † Heterostraci
    Last Modified in 05/20/16
    14555400005
    [6] † Astraspis
    Last Modified in 05/20/16
    31373700005
    [7] † Eriptychius
    Last Modified in 05/20/16
    48202000005
    [8] † Arandaspida
    Last Modified in 05/20/16
    27414100005
    [9] † Anaspida
    Last Modified in 05/20/16
    21474700005
    [10] † Jamoytius
    Last Modified in 05/20/16
    37313100005
    [11] † Euphanerops
    Last Modified in 05/20/16
    23454500005
    [12] † Osteostraci
    Last Modified in 05/20/16
    2666600005
    [13] † Galeaspida
    Last Modified in 05/20/16
    7616100005
    [14] † Loganellia scotica
    Last Modified in 05/20/16
    30393800005
    [15] † Pituriaspida
    Last Modified in 05/20/16
    52161600005
    [16] Jawed vertebrates
    Last Modified in 12/05/13
    1716700005
    [17] † Conodonta
    Last Modified in 05/20/16
    33353500005
    [18] † Yunnanozoon
    Last Modified in 05/20/16
    22474600005
    [19] † Myllokunmingia
    Last Modified in 05/20/16
    26434200005


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    Total project views10218
    Project overview1300
    Matrix views1002Matrix landing page (979 views); Matrix (23 views);
    Media views2485Media search (2153 views); M109086 (332 views);
    Taxon list4096
    Specimen list897
    Bibliography438




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    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project141
    Project downloads137
    Matrix downloads4Matrix (4 downloads);