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Re: Dino that hopped like a Kangaroo?

Art Sippo (ArtSippo@aol.com) wrote:

<I recall reading that there was a theropod that it was speculated could
have hopped in a manner similar to that of the kangaroo.  Does anyone know
which dinosaur that would be?>

  This would have been the oft-suggested rabbit crocs, which some regard
as basal theropods. They are not actually dinosaurs. *Lagosuchus* (a nomen
dubium based on a non-diagnostic hindlimb), *Marasuchus*, and *Lagerpeton*
have extremely long hindlegs with long propodia, and a calcaneum with a
posterolateral tuber. This tuber would have increased the moment of the
propodial extension, and would have enabled the animal to "hop." Birds
have a similar process on their tarsometatarsi that would have done pretty
much the same thing. This is how those little archosaurs got the name
"lago-" or "mara-" attached to their names, little hopping reptiles.
Incidentally, kangaroos don't hop, they "ricochet" (Muybridge, 1903).


Jaime A. Headden

  Little steps are often the hardest to take.  We are too used to making leaps 
in the face of adversity, that a simple skip is so hard to do.  We should all 
learn to walk soft, walk small, see the world around us rather than zoom by it.

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