Project 4416: Zhou Z. 1991. Phylogeny and evolutionary trends of Mesozoic ginkgoaleans — a preliminary assessment. Review of Palaeobotany and Palynology. 68 (3-4):203-216.
Specimen: Ginkgo (unvouchered)
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Abstract

A cladistic analysis of Mesozoic ginkgoaleans is made based on new evidence from the Middle Jurassic of Henan, China, together with previously known fossil records. Cordaites plus early conifers have been chosen as out-group for evaluating polarities of characters of ginkgoaleans. The analysis favours a monphyletic group of Ginkgoales including Trichopitys, Karkenia, Toretzia, Umaltolepis, Yimaia and Ginkgo. The most parsimonious cladogram shows that Ginkgo and Yimaia are phylogenetically closely related sister taxa and so are Toretzia and Umaltolepis, while Karkenia appears to represent a distinct evolutionary lineage of Ginkgoales in the Mesozoic. Based on the analysis, a provisional classification of Ginkgoales is proposed.

The ovulate shoots of Trichopitys may be regarded as a putative archetype or its analogue from which various ovule-bearing organs of ginkgoaleans originated. All Mesozoic members are characterized by having short shoots and laminated leaves. The main evolutionary trends of vegetative parts in Ginkgoales are considered to be reduction of shoots and webbing and fusion of leaves. Their fertile shoots also tend towards reduction. Ovules become sessibe and reduced in number but increase in size through geological time.



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Article DOI: 10.1016/0034-6667(91)90024-W

Project DOI: 10.7934/P4416, http://dx.doi.org/10.7934/P4416
This project containsMatrices
  • 1 Media
  • 1 Matrix
  • 1 Document
  • 7 Taxa
  • 1 Specimen
  • 9 Characters
Total size of project's media files: 1.09M

Download Project SDD File
Total scored cells: 65
Total media associated with cells: 0
Total labels associated with cell media: 0
Characters
Total characters: 9
Total characters with associated media: 0
Total characters with media with labels: 0
Total character states: 18
Total character states with associated media: 0
Total character states with media with labels:0
Total unordered/ordered characters:9/0
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MorphoBank Project 4416
  • Creation Date:
    25 September 2022
  • Publication Date:
    10 October 2022
  • Matrix downloads: 1

    Authors' Institutions

    • Academia Sinica

    • Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
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    MorphoBank Curator
    Project Administrator
    71190065
    (65, 0, 0)
    000
    Zhi-Yan Zhou
    Full membership
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M28989' (7 Taxa)

    taxon unscored
    cells
    scored
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    no cell
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    NPA
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    "-" cellscell images labels on
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    [1] † Cordaites (and early conifers)
    Taxon name last Modified on 09/25/22
    012900002
    [2] † Trichopitys
    Taxon name last Modified on 09/25/22
    27700002
    [3] † Karkenia
    Taxon name last Modified on 09/25/22
    010900002
    [4] † Toretzia
    Taxon name last Modified on 09/25/22
    09900002
    [5] † Umaltolepis
    Taxon name last Modified on 09/25/22
    09900002
    [6] † Yimaia
    Taxon name last Modified on 09/25/22
    09900002
    [7] Ginkgo
    Taxon name last Modified on 09/25/22
    09900002


    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project4
    Project downloads3
    Matrix downloads1Morphological matrix from Zhou 1991 (prepared by MorphoBank curators from original submission) (1 download);