Sökning: "SILURIAN"

Visar resultat 16 - 20 av 39 avhandlingar innehållade ordet SILURIAN.

  1. 16. Diversity and life habits of Silurian strophomenide brachiopods of Gotland

    Författare :Ole A. Hoel; Uppsala universitet; []
    Nyckelord :;

    Sammanfattning : .... LÄS MER

  3. 17. Ostracodes of the family Beyrichiidae from the Silurian of Gotland

    Författare :Anders Martinsson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earth sciences; Geovetenskap;

    Sammanfattning : .... LÄS MER

  4. 18. Vertebrate remains from the Upper Silurian-Lower Devonian of North Greenland

    Författare :Henning Blom; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Utvecklingsbiologi;

    Sammanfattning : .... LÄS MER

  5. 19. Deposition, palaeoecology and diagenesis of the Silurian reef-like limestones on Gotland

    Författare :Akihiro Kano; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Several Silurian (Wenlockian-Ludlovian) reef-like limestones on Gotland wereselected for studies of depositional, palaeoecological, and diagenetic conditions. Thereef-like limestones were deposited on a warm, shallow and open marine shelf. LÄS MER

  7. 20. The Origin of Tooth Replacement : Three-dimensional Synchrotron Histology Visualizes the Dental Development of Silurian Stem Osteichthyans

    Författare :Donglei Chen; Per Ahlberg; Zerina Johanson; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Mechanisms of tooth replacement distribute incongruently among extant gnathostomes (jawed vertebrates): a permanent tooth-generating dental lamina exists in chondrichthyans (cartilaginous fish) and tetrapods but not teleosts, whereas tooth shedding by basal hard tissue resorption occurs in tetrapods and teleosts but not chondrichthyans. Theories about the evolution of tooth development have been biased towards the chondrichthyan conveyor-belt replacement, since there has been no fossil evidence for the origin of osteichthyan (bony fish and tetrapods) tooth replacement until now. LÄS MER