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Re: Aquatic Apes and Aquatic Dinos

Actually, I published a paper on this subject a couple of years ago. But
I was certainly not the first to do so. Here's an abstract from my

The adaptive significance of endothermy and salt excretion amongst the
earliest archosaurs

        Evidence, amongst Triassic thecodonts, of energetic upright postures
and advanced bipedalism (or the vestiges of such characteristics)
reveals that both endothermic and ectothermic thecodonts were descended
from warm-blooded archosaurs with rapid metabolisms.   Arboreal and
aquatic adaptations in bipedal iguanians, and in extinct thecodonts,
suggest that the emergence of reptilian bipedal locomotion  is related
to an arboreal-aquatic existence.  But endothermy required obligatory
bipedalism could not have arisen in fauna poor freshwater environments. 
The possible existence, in faunivorous thecodonts, of functional (or
vestigial) cranial salt glands may suggest that the earliest semiaquatic
archosaurs originated in fauna prolific marine environments.  If
archosaurs were originally semiaquatic (marine) predators, then the
existence of archosaurian endothermy could have initially emerged as an
adaptation to increase metabolic heat production under the enhanced
thermal cold stresses of the marine hydrosphere, while concurrently
augmenting the rate of metabolic water production within saltwater
environments inherently lacking in palatable freshwater resources.      

Marcel F. Williams (1997) Speculations in Science and Technology 20,
And here are some other references on the subject of semiaquatic
behavior and bipedalism in archosaurs:

Chapter 10: The problem of ancient bipedality from 
Neill, W.T., The Last of the Ruling Reptiles.  Columbia University
Press, New York (1971).
Coombs, W.P., 'Swimming ability of carnivorous dinosaurs', Science, 207,
1198-1200 (1980).
Paul, G.S., Predatorv Dinosaurs of the World. Simon and Schuster, New
York (1988).
Walker, A.D., 'New light on the origin of birds and crocodiles', Nature,
237, 257-263 (1972).
Halstead, L.B. and Halstead, J., Dinosaurs. Blandford Press, Poole,
Dorset (1981). 
Desmond, A.J., The Hot-Blooded Dinosaurs. The Dial Press/ James Wade,
New York (1976).

Marcel F. Williams