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  • Herrera, FabianyChicago Botanic Garden (author)

Reconstructing Krassilovia mongolica supports recognition of a new and unusual group of Mesozoic conifers

  • Article/chapterEnglish2020

Publisher, publication year, extent ...

  • 2020-01-15
  • PLoS,2020
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:nrm-4150
  • https://urn.kb.se/resolve?urn=urn:nbn:se:nrm:diva-4150URI
  • https://doi.org/10.1371/journal.pone.0226779DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • Funding for this work was provided by National Science Foundation grants DEB-1748286 to P.S.H., P.R.C. and F.H., and 1348456 to P.R.C. and P.S.H., the Oak Spring Garden Foundation to F.H., and Grants-in-Aid for Scientific Research (21405010 and 24405015) from the Japan Society.
  • Previously unrecognized anatomical features of the cone scales of the enigmatic Early Cretaceous conifer Krassilovia mongolica include the presence of transversely oriented paracytic stomata, which is unusual for all other extinct and extant conifers. Identical stomata arepresent on co-occurring broad, linear, multiveined leaves assigned to Podozamites harrisii, providing evidence that K. mongolica and P. harrisii are the seed cones and leaves of the same extinct plant. Phylogenetic analyses of the relationships of the reconstructed Krassilovia plant place it in an informal clade that we name the Krassilovia Clade, which also includes Swedenborgia cryptomerioides–Podozamites schenkii, and Cycadocarpidium erdmanni–Podozamites schenkii. All three of these plants have linear leaves that are relatively broad compared to most living conifers, and that are also multiveined with transversely oriented paracytic stomata. We propose that these may be general features of the Krassilovia Clade. Paracytic stomata, and other features of this new group, recall features of extant and fossil Gnetales, raising questions about the phylogenetic homogeneity of the conifer clade similar to those raised by phylogenetic analyses of molecular data.

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  • Shi, GongleState Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology (author)
  • Mays, Chris,1983-Naturhistoriska riksmuseet,Enheten för paleobiologi(Swepub:nrm)chrimays (author)
  • Ichinnorov, NiidenInstitute of Paleontology and Geology, Mongolian Academy of Sciences (author)
  • Takahashi, MasamichiDepartment of Environmental Sciences, Faculty of Science, Niigata University (author)
  • Bevitt, JosephAustralian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation (author)
  • Herendeen, PatrickChicago Botanic Garden (author)
  • Crane, Peter RobertOak Spring Gardens (author)
  • Chicago Botanic GardenState Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology (creator_code:org_t)

Related titles

  • In:PLOS ONE: PLoS15:1, s. 1-211932-6203

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