[Taxacom] Eccrine glands
jcclark-lists at earthlink.net
Wed Mar 25 00:01:28 CDT 2009
On 2009-03-24 08:19, Kenneth Kinman wrote:
> Well, I didn't actually set myself up, because I specified "fish".
> Owls are descendants of fish, but they are not fish.
Not according to my cladist ichthyologist friend (although he explicitly
doesn't study the feathered flying fish).
> As for eccrine glands, one could probably write a whole book on
> their distribution. In short, different mammalian taxa solve their
> thermoregulatory problems in different ways. Carnivores pant (think of
> it as "internal sweating" through the lungs) probably because
> sweat-soaked coats would be problematic. People and horses with less
> dense coats can more freely sweat externally. Elephants could have done
> the same, but they conserve water by using their big ears to
> thermoregulate. Also depends on the availability of water to drink and
> in their food (desert animals can't afford to sweat a lot).
So are you saying that their distribution is too labile for phylogenetic
use? What is the plesiomorphy?
Curtis Clark http://www.csupomona.edu/~jcclark/
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