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RE: [dinosaur] Fossorial Origin of the Turtle Shell

> -----Original Message-----
> From: dinosaur-l-request@usc.edu [mailto:dinosaur-l-request@usc.edu] On 
> Behalf Of Tim Williams
> Sent: Monday, July 18, 2016 4:14 AM
> To: dinosaur-l@usc.edu
> Subject: Re: [dinosaur] Fossorial Origin of the Turtle Shell
> 
> Dann Pigdon <dannj@alphalink.com.au> wrote:
> 
> > The echidna's weekly developed electroceptors certainly suggest an
> > aquatic origin. However the platypus is also an accomplished digger,
> > which raises the possibility that the theoretical aquatic platypus/echidna 
> > ancestor may have itself arisen from burrowers, making the
> echidna secondarily fossorial as wll.
> 
> 
> Interesting.  I guess, for small tetrapods, swimming and digging/burrowing go 
> together quite well - which makes the transition quite
> easy in either direction.
> 
Even animals larger like this--muskrats, beavers--are both burrowers and 
swimmers.

Thomas R. Holtz, Jr.
Email: tholtz@umd.edu         Phone: 301-405-4084
Principal Lecturer, Vertebrate Paleontology
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Mailing Address:        Thomas R. Holtz, Jr.
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