Project 2691: N. A. Jud, G. W. Rothwell, R. A. Stockey. 2008. Todea from the Lower Cretaceous of western North America: implications for the phylogeny, systematics, and evolution of modern Osmundaceae. American Journal of Botany. 95:330-339.
Specimen: † Todea tidwellii (University of Alberta Paleobotanical Collections:P14466)
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Abstract

The first fossil evidence for the fern genus Todea has been recovered from the Lower Cretaceous of British Columbia, Canada, providing paleontological data to strengthen hypotheses regarding patterns of evolution and phylogeny within Osmundaceae. The fossil consists of a branching rhizome, adventitious roots, and leaf bases. The dictyoxylic stem has up to eight xylem bundles around a sclerenchymatous pith. Leaf traces diverge from cauline bundles in a typical osmundaceous pattern and leaf bases display a sheath of sclerenchyma around a C-shaped xylem trace with 2–8 protoxylem strands. Within the adaxial concavity of each leaf trace, a single sclerenchyma bundle becomes C-shaped as it enters the cortex. The sclerotic cortex is heterogeneous with an indistinct outer margin. The discovery of Todea tidwellii sp. nov. reveals that the genus Todea evolved by the Lower Cretaceous. A phylogenetic analysis combining morphological characters of living and extinct species with a previously published nucleotide sequence matrix confirms the taxonomic placement of T. tidwellii. Results also support the hypothesis that Osmunda s.l. represents a paraphyletic assemblage and that living species be segregated into two genera, Osmunda and Osmundastrum. Fossil evidence confirms that Osmundaceae originated in the Southern Hemisphere during the Permian, underwent rapid diversification, and species extended around the world during the Triassic. Crown group Osmundaceae originated by the Late Triassic, with living species appearing by the Late Cretaceous.


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Article DOI: 10.3732/ajb.95.3.330

Project DOI: 10.7934/P2691, http://dx.doi.org/10.7934/P2691
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 17 Taxa
  • 1 Specimen
  • 41 Characters
Total size of project's media files: 3 MB

Download Project SDD File
Total scored cells: 643
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 41
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 94
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:41/0
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MorphoBank Project 2691
  • Creation Date:
    23 May 2017
  • Publication Date:
    26 May 2017
  • Project views: 4897


    Members

    member name taxa specimens media chars character
    comms
       
    notes  media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Nathan Jud
    Project Administrator
    Last logged in 05/26/17
    1711410000643
    (612, 0, 31)
    000


    Taxonomic Overview for Matrix 'M24691' (17 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Ophioglossum reticulatum
    Last Modified in 05/23/17
    2393900001
    [2] Angiopteris lygodiifolia
    Last Modified in 05/23/17
    1404000001
    [3] Cephalomanes thysanostomum
    Last Modified in 05/23/17
    10313100001
    [4] Lygodium japanicum
    Last Modified in 05/23/17
    7343400001
    [5] Gleichenia japonica
    Last Modified in 05/23/17
    1404000001
    [6] Dryopteris cristata
    Last Modified in 05/23/17
    9323200001
    [7] Stegnogramma pozoi
    Last Modified in 05/23/17
    13282800001
    [8] Todea barbara (new zealand)
    Last Modified in 05/23/17
    1383802001
    [9] Todea barbara (south africa)
    Last Modified in 05/23/17
    0373704001
    [10] Osmundastrum cinnamomum (usa)
    Last Modified in 05/23/17
    1383802001
    [11] Osmundastrum cinnamomum (japan)
    Last Modified in 05/23/17
    0363605001
    [12] Leptopteris hymenophylloides (new zealand)
    Last Modified in 05/23/17
    1383802001
    [13] Leptopteris wilkesiana (new caledonia)
    Last Modified in 05/23/17
    0363605001
    [14] Osmunda regalis (usa)
    Last Modified in 05/23/17
    1383802001
    [15] Osmunda regalis (uk)
    Last Modified in 05/23/17
    0363605001
    [16] Osmunda vachellii (malaysia)
    Last Modified in 05/23/17
    1383802001
    [17] † Todea tidwellii
    Last Modified in 05/26/17
    6333302001


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    Taxon list1780
    Specimen list440
    Views for media list272
    Bibliography185
    Media views985Media search (853 views); M451548 (132 views);




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