The origin and early diversification of tetrapods

  title={The origin and early diversification of tetrapods},
  author={P. Ahlberg and A. R. Milner},
  • P. Ahlberg, A. R. Milner
  • Published 1994
  • Biology
  • Nature
  • A series of new fossil discoveries, coupled with cladistic analysis of old and new data, is beginning to resolve the origin of tetrapods into a documented sequence of character acquisition. Devonian tetrapods were more fish-like than believed previously, whereas Lower Carboniferous tetrapod faunas contain early representatives of the amphibian and amniote lineages. These very different assemblages are separated by a 20-million-year Tournaisian gap' which has yielded very few tetrapod fossils.