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

Autoři: Fabiany Herrera aff001;  Gongle Shi aff002;  Chris Mays aff003;  Niiden Ichinnorov aff005;  Masamichi Takahashi aff006;  Joseph J. Bevitt aff007;  Patrick S. Herendeen aff001;  Peter R. Crane aff008
Působiště autorů: Chicago Botanic Garden, Glencoe, Illinois, United States of America aff001;  State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing, People’s Republic of China aff002;  Department of Palaeobiology, Swedish Museum of Natural History, Stockholm, Sweden aff003;  School of Earth, Atmosphere and Environment, Monash University, Clayton, Victoria, Australia aff004;  Institute of Paleontology and Geology, Mongolian Academy of Sciences, Ulaanbaatar, Mongolia aff005;  Department of Environmental Sciences, Faculty of Science, Niigata University, Nishi-ku, Niigata, Japan aff006;  Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, New South Wales, Australia aff007;  Oak Spring Garden Foundation, Upperville, Virginia, United States of America aff008;  School of Forestry and Environmental Studies, Yale University, New Haven, Connecticut, United States of America aff009
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226779


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 are present 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.

Klíčová slova:

Conifers – Flowering plants – Leaves – Phylogenetic analysis – Seeds – Stomata – Paleobotany – Plant fossils


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