Phylogeny, classification and character polarity of the Osteostraci (Vertebrata)

  title={Phylogeny, classification and character polarity of the Osteostraci (Vertebrata)},
  author={R. Sansom},
  journal={Journal of Systematic Palaeontology},
  pages={115 - 95}
  • R. Sansom
  • Published 2009
  • Biology
  • Journal of Systematic Palaeontology
  • Synopsis The jawless Osteostraci are the sister taxon to jawed vertebrates and, thus, are integral to understanding the evolution of gnathostomes from a jawless ancestor. Our understanding of this episode is currently hampered by incomplete knowledge of osteostracan phylogenetics and character polarity. Previous hypotheses of osteostracan intrarelations are reviewed and synthesised into two conflicting hypotheses ‐ ’Tremataspis‐basal’ versus ’Ateleaspis‐basal’ models, both related to the… CONTINUE READING
    47 Citations
    The characters of Palaeozoic jawed vertebrates
    • 56
    The dermal skeleton of the jawless vertebrate Tremataspis mammillata (Osteostraci, stem‐Gnathostomata)
    • 2
    • PDF
    Early vertebrate evolution
    • 32
    • PDF
    The Earliest Osteostracan Kalanaspis delectabilis Gen. Et Sp. Nov. from the Mid-Aeronian (Mid-Llandovery, Lower Silurian) of Estonia
    • 2
    • Highly Influenced


    Conodont affinity and chordate phylogeny
    • 261
    • PDF
    Histology and affinity of the earliest armoured vertebrate
    • 38
    • PDF