I dont know if this helps or hurts so if it cann not bee used in "prooving" one way or the other than please ignore this one.
Gladyshev in Advanced Gerontology 2002-Vol.9-P49-53 on page 53 wrote, "It has been established that the evolution is described both by thermodynamic and kinetic factors and by the trajectory factor (symmetry or chirality) which should be accounted for in rotating systems. The Coriolis forces can support spiral bio-structures to a different degree depending on the habitation area of organism."
There IS PROIR INFORMATION, right here on EVC, and though I have yet to send another personal email to Russia since the spring, my contribution here nairly makes a habit out of GG's "habitat" and indeed in the extended discussion in my namesakethread I have limited this "habitation area" to an age and error of Aggasiz (in my own mind at least). I hope to be able to explain this better, on these other threads, at a latter time. Nonetheless I do believe we at EVC HAVE been able to diminish this extent to less than the universe. So no, I would not say "turtles all the way down".