Xenacanthida
Код 2384184
- ISBN: 978-5-5111-2703-3
Код 2384184
High Quality Content by WIKIPEDIA articles! Xenacanthida (or Xenacanthiforms) is an order of prehistoric sharks that appeared during the Lower Carboniferous period. The family includes the families Xenacanthidae, Diplodoselachidae, and Orthacanthidae. The most notable members of the group are the genera Xenacanthus and Orthacanthus. Some Xenacanthus may have grown to lengths of 4 m (13 ft). This group of sharks inhabited freshwater environments. Some forms had large serrated spines extending...
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