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Re: CROCODYLOMORPH ENDOTHERMY
On Thu, 25 Jan 1996 Dinogeorge@aol.com wrote:
> In a message dated 96-01-24 21:46:31 EST, pharrinj@PLU.edu (Nicholas J.
> Pharris) writes:
> >Thank you both for the info, but has any work been done re: histology (or
> >anything else) to find out at what point in their evolution crocs
> >returned to ectothermy? What sort of temperature control do they maintain?
> "Returned to ectothermy"? As far as I know, all crurotarsan thecodontians
> were always ectotherms. But with four-chambered hearts.
According to Bakker, erythrosuchids and some other early thecodontians, at
least, had low P/P ratios and plexiform bone (two features I continue to
belive indicate endothermy).
Early crocs were also long-limbed, even partly bipedal.
I'm not convinced that an ectotherm would need a four-chambered heart.
Pacific Lutheran University
Tacoma, WA 98447
"If you can't convince them, confuse them." -- Harry S. Truman