Ultrastructural observations on the platelets of the Arabian oryx (Oryx leucoryx)

Ahmed Saif Hilal Al-Amri, Waleed Al-Marzooqi, Mohammed Al-Abri, Eugene H. Johnson*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


An ultrastructural study on the platelets from peripheral blood samples from 20 healthy adult Arabian oryx (Oryx leucocoryx) was performed. Characteristic was the extreme polymorphism of both the platelets, as well as their alpha granules. They vary in size from 100 to 800 nm in diameter and their numbers typically are less than those reported for humans and other animal species. Also, the alpha granules in contrast to those of humans and animals, such as the Arabian tahr, do not have nucleoids. Typically, the oryx platelets exhibit only 1–2 electron-dense bodies per cell and they lack an open canalicular system. Of particular interest is the presence of Type I multivesicular bodies, which have previously only been described in human megakaryocytes and are hypothesized as being intermediate development stages of alpha and dense granules.

Original languageEnglish
Pages (from-to)244-249
Number of pages6
JournalJournal of Veterinary Medicine Series C: Anatomia Histologia Embryologia
Issue number3
Publication statusPublished - May 10 2019


  • oryx
  • platelets
  • ultrastructure

ASJC Scopus subject areas

  • General Veterinary


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