Origin and Radiation of the Earliest Vascular Land Plants

  title={Origin and Radiation of the Earliest Vascular Land Plants},
  author={P. Steemans and A. H{\'e}riss{\'e} and J. Melvin and Merrell A. Miller and F. Paris and J. Verniers and C. Wellman},
  pages={353 - 353}
Colonization of the land by plants most likely occurred in a stepwise fashion starting in the Mid-Ordovician. The earliest flora of bryophyte-like plants appears to have been cosmopolitan and dominated the planet, relatively unchanged, for some 30 million years. It is represented by fossilized dispersed cryptospores and fragmentary plant remains. In the Early Silurian, cryptospore abundance and diversity diminished abruptly as trilete spores appeared, became abundant, and underwent rapid… Expand

Topics from this paper

Palaeozoic Innovations in the Micro- and Megafossil Plant Record: From the Earliest Plant Spores to the Earliest Seeds
Recently, major advances have been made in understanding terrestrialization processes and the development of early vegetation. This chapter reviews the major steps in the evolution of early landExpand
Evolution of the plant body plan.
Evidence of the fossil record, phylogenetics, and developmental biology suggest that land plants have evolved from fresh-water charophycean algae, which were physiologically, genetically, and developmentally potentiated to make the transition to land. Expand
Evolution of land plants: insights from molecular studies on basal lineages
  • K. Ishizaki
  • Biology, Medicine
  • Bioscience, biotechnology, and biochemistry
  • 2017
The evolution of the genes and regulatory mechanisms that helped drive such significant morphological innovations among land-based plants are discussed. Expand
The origin of the angiosperm flower remains unresolved, but bitegmic ovules may be derived from cupules, and the ancestral carpel can be reconstructed as ascidiate. Expand
Ecology, forms and functions of the basal angiosperms from New Caledonia
The distribution of basal angiosperms in New Caledonia, as well as their drought sensitivity, support the hypothesis suggesting that early angios perms lived in humid and stable environments and that sympodial growth may have been acquired early during angiosPerms evolution. Expand
Plant evolution and terrestrialization during Palaeozoic times—The phylogenetic context
The new term “proembryophytic phase” is introduced to define the very long period of time during which the green algae ancestor of land plants acquired all the evolutionary characters that ultimately allowed their terrestrialization since the late Precambrian. Expand
Revisiting the Great Ordovician Diversification of land plants: Recent data and perspectives
Abstract Recent molecular clock data suggest with high probability a Cambrian origin of Embryophyta (also called land plants), indicating that their terrestrialization most probably started about 500Expand
Morphological evolution in land plants: new designs with old genes
  • N. Pires, L. Dolan
  • Biology, Medicine
  • Philosophical Transactions of the Royal Society B: Biological Sciences
  • 2012
Recent studies indicate that many of the gene families which control development in extant plants were already present in the earliest land plants, suggesting that the evolution of novel morphologies was to a large degree driven by the reassembly and reuse of pre-existing genetic mechanisms. Expand
Did Terrestrial Diversification of Amoebas (Amoebozoa) Occur in Synchrony with Land Plants?
Analysis of the evolutionary history of the supergroup Amoebozoa over the last 1000 million years using molecular dating and species number estimates points to a co-evolution within the terrestrial habitats, where land plants and the amoebozoans may have interacted during the evolution of these new ecosystems. Expand
Baltica cradle of early land plants? Oldest record of trilete spores and diverse cryptospore assemblages; evidence from Ordovician successions of Sweden
ABSTRACT The origin of land plants is one of the most important evolutionary events in Earth’s history. The mode and timing of the terrestrialization of plants remains debated and previous dataExpand


The microfossil record of early land plants: advances in understanding of early terrestrialization, 1970-1984
The interval from the mid Ordovician to the mid-late Early Silurian is hypothesized on the basis of the abundant and widespread spore records to be one of rapid colonization by founder populations with limited genetic diversity and with life-history strategies that included an ecophysiological tolerance to desiccation and a short vegetative life cycle. Expand
Fragments of the earliest land plants
These fossils provide direct evidence for the nature of the spore-producing plants and confirm that the earliest spores developed in large numbers within sporangia, providing strong evidence that they are the fossilized remains of bona fide land plants. Expand
Miospore evolution from the Ordovician to the Silurian.
  • P. Steemans
  • Geology, Medicine
  • Review of palaeobotany and palynology
  • 2000
The definition of the term cryptospore is amended to include only spores thought to be produced by embryophytes and to exclude all enigmatic palynomorphs. Cryptospores are included here in theExpand
Terra Nostra
  • Stratigraphic palynology of the Palaeozoic of Saudi Arabia Terra Nostra . Schriften der GeoUnion Alfred - Wegener Stiftung
  • 2008