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Pachyostosis is a condition in vertebrate animals[1] in which the bones experience a thickening, resulting in unusually solid bone structure with little to no marrow.[2] It occurs in both terrestrial and aquatic vertebrates, such as manatees and dugongs, giant deer,[3] plesiosaurs, and members of the Dinocephalia clade of therapsids.


  1. ^ Sci-Tech Dictionary. McGraw-Hill Dictionary of Scientific and Technical Terms.
  2. ^ Definition
  3. ^ Lister, A. M. (1994). The evolution of the giant deer, Megaloceros giganteus (Blumenbach). Zoological Journal of the Linnean Society 112(1-2): 65-100.