[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]
Re: Fwd: Protoceratopsoid tails adapted for swimming
or to live in a desert....yes, I will keep harping on this.
On 4 December 2013 21:54, Dann Pigdon <firstname.lastname@example.org> wrote:
> On Wed, Dec 4th, 2013 at 10:29 PM, Michael OSullivan
> <email@example.com> wrote:
>> Not the first time this idea has been put forward for neoceratopsians
>> or any animal with high neural spines on the tail. However, apart from
>> the, to me, fairly obvious lack of aquatic adaptation in the body
>> (I've heard the hippo argument for ceratopsians a couple of times
>> before but yet to see any major support for this) the environmental
>> considerations strongly argue against this that three of these taxa
>> come from a desert environment. It is extremely unlikely that
>> herbivores/omnivores which occupy a desert are going to possess strong
>> aquatic adaptations.
> Hippos can't actually swim. They move through the water by walking across the
> bottom. Their solid
> limb bones give them no bouyancy whatsoever, so they tend to drown if stuck
> in deep water they
> can't walk out of. When you see what looks like a hippo bobbing in the water
> with its head visible
> at the surface, it's actually sitting dog-like on the bottom of fairly
> shallow water.
> If protoceratopsoids were filling a similar niche to that of modern hippos,
> they wouldn't have
> needed flattened tails. Or indeed tails at all.
> Dann Pigdon
> Spatial Data Analyst Australian Dinosaurs
> Melbourne, Australia http://home.alphalink.com.au/~dannj
Palaeobiology Research Group
School of Earth & Environmental Sciences