Osteostraci

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The class Osteostraci ("Bony Shields") was a group of bony-armored jawless fish, termed "ostracoderms", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian. Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans. This is due to the development of paired fins, and their complicated cranial anatomy. The osteostracans were more similar to lampreys than to jawed vertebrates in possessing two pairs of semicircular canals in the inner ear, as opposed to the three pairs found in the inner ears of jawed vertebrates. They are thought to be the sister-group of pituriaspids, and together, these two taxa of jawless vertebrates are the sister-group of gnathostomes.

Weitere Informationen

  • Allgemeine Informationen
    • GTIN 09786137966938
    • Editor Theia Lucina Gerhild
    • Sprache Englisch
    • Auflage Aufl.
    • Größe H220mm x B220mm
    • Jahr 2011
    • EAN 9786137966938
    • Format Kartonierter Einband (Kt)
    • ISBN 978-613-7-96693-8
    • Titel Osteostraci
    • Untertitel Ostracoderm, Lamprey
    • Herausgeber POLIC
    • Anzahl Seiten 112
    • Genre Biologie

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