Aardonyx

Name: Aardonyx ‭(‬Earth claw‭)‬.
Phonetic: Ard-oh-nix.
Named By: Yates et al.‭ ‬-‭ ‬2010.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Sauropodomorpha,‭ ‬Prosauropoda.
Species: A.‭ ‬celestae.
Type: Herbivore.
Size: 6‭ ‬meters long.
Known locations: South Africa‭ ‬-‭ ‬Elliot Formation.
Time period: Hattangian to Sinemurian of the Jurassic.
Fossil representation: Partial remains including vertebra,‭ ‬ribs,‭ ‬parts of shoulder girdle,‭ ‬fore and aft limbs,‭ ‬ischium,‭ ‬pubis and partial skull.‭ ‬These remains have been confirmed to come from two juveniles.

       Aardonyx is a very special sauropodomorph as it represents the transitional stage between bipedal ancestors and quadrupedal descendants.‭ ‬This change is most evident when examining the legs,‭ ‬which show adaptations for a slower,‭ ‬yet more powerful method of walking.‭ ‬These changes combined with an increasingly quadrupedal method of weight bearing would allow the sauropods to grow to truly gigantic sizes.
       When determining an animal’s age at the time of death,‭ ‬scientists can count the growth rings present in cortical bone structures.‭ ‬When this was done for Aardonyx,‭ ‬both individuals were found to be no more than ten years of age.‭ ‬The exact nature of their deaths is undetermined,‭ ‬but both were found together with a small amount of bone scattering.‭ ‬The fact that they were largely undisturbed might point to natural causes such as two Aardonyx being drowned in a flash flood and then being deposited together.‭ ‬The fact that two that were of the same age died together may indicate that they were also wandering around together in life,‭ ‬and were perhaps part of a larger group.

Further reading
- A new transitional sauropodomorph dinosaur from the Early Jurassic of South Africa and the evolution of sauropod feeding and quadrupedalism - Proceedings of the Royal Society B 277 (1682): 787–794 - A. M. Yates, M. F. Bonnan, J. Neveling, A. Chinsamy & M. G. Blackbeard - 2010.



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