Molecular Biology and Genetics

Molecular Biology

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Wikipedia

Struthio

Struthio is a genus of bird in the order Struthioniformes.

Species[edit source | edit]

There are ten known species from this genus, of which eight are extinct. There are five more possible species of which trace fossils have been found. They are:

Fossil records and egg shell fragments show that the ancestors of this genus originated about 40-58 million years ago (mya) in the Asiatic steppes as small flightless birds. The earliest fossils from this genus are from the early Miocene (20-25mya), and are from Africa, so it is proposed that they originated there. Then by the middle to late Miocene (5-13mya) they had spread to Eurasia.[2] By about 12 mya they had evolved into the larger size of which we are familiar. By this time they had spread to Mongolia and, later, South Africa.[3]

Evolution[edit source | edit]

The genus Struthio used to include the Emu, Rhea, and also the Cassowary, until they each were placed in their own genera.[1] The Somali Ostrich, Struthio molybdophanes, has recently become recognized as a separate species by some authorities, while others are still reviewing the information.[4][5]

Footnotes[edit source | edit]

  1. ^ a b Gray, G.R. (1855)
  2. ^ Hou, L. et al. (2005)
  3. ^ Davies, S.J.J.F. (2003)
  4. ^ Gil, F. & Donsker D. (2012)
  5. ^ Birdlife International (2012)

References[edit source | edit]

  • Davies, S. J. J. F. (2003). Ostriches. In Hutchins, Michael. "Birds I Tinamous and Ratites to Hoatzins". Grzimek's Animal Life Encyclopedia 8 (2nd ed.). Farmington Hills, MI: Gale Group. p. 99. ISBN 0-7876-5784-0. 
  • Gill, F.; Donsker, D (2012). "Ratites". IOC World Bird List. WorldBirdNames.org. Retrieved 13 Jun 2012. 
  • Hou, L.; Zhou, Z.; Zhang, F.; Wang, Z. (Aug 2005). "A Miocene ostrich fossil from Gansu Province, northwest China". Chinese Science Bulletin 50 (16): 1 Extra |pages= or |at= (help). doi:10.1360/982005-575. ISSN 1861-9541. 
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