The Telencephalon of Sarcopterygian Fishes

  • R. Nieuwenhuys
  • J. Meek
Part of the Cerebral Cortex book series (CECO, volume 8A)


Crossopterygians are a distinctive and once widespread group of fishes, first known from rocks of Devonian age. They are characterized by the possession of two dorsal fins, the cosmoid structure of their scales and dermal bones, and well-formed fleshy-lobed paired fins. The internal skeleton of the latter is much concentrated so that only a single bone (humerus, femur) articulates proximally with the girdles and distally with two bones (radius and ulna, tibia and fibula). The latter are followed by the more variable distal fin supports. The most important distinguishing feature of these fishes is the division of the neurocranium into two parts, an anterior, ethmo-sphenoid portion and a posterior, otico-occipital portion with an intracranial joint between them. The large, persistent notochord inserts upon the postero-ventral margin of the ethmosphenoid portion of the skull (Thomson, 1969; Moy-Thomas and Miles, 1971; Andrews, 1973).


Olfactory Bulb Anterior Commissure Caudal Part Rostral Part Cartilaginous Fish 


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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • R. Nieuwenhuys
    • 1
  • J. Meek
    • 1
  1. 1.Department of Anatomy and EmbryologyUniversity of NijmegenNijmegenThe Netherlands

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