Once only evolution of Brooding level endothermy

["Larry Febo" <larryf@capital.net>]

There`s only one other option that I would find acceptable thats still in
accord with my theory of one time development of endothermy. I don`t know
why I overlooked it, except that I was concentrating on present day
warm-blooded mammals. and birds, figuring anapsids represented by the turtle
clan to be pure cold bloods. (Guess my mind on that matter is still 25 years
behind the times) That would be that ANAPSIDS themselves once had the warm
blooded ability to brood their eggs, BEFORE either the synapsid or diapsid
split. Now, Dr. Holtz, you may not agree with that either, but it`s the only
thing that makes sense to me at this point. At any rate, I think it deserves
a closer look. ( I still don`t think  diapsids could have developed warm
from a cold-blooded condition, if the synapsids already had it, and
dominated the landscape).