Originally posted by blocula
i don't know?...the less oxygen levels of today, have'nt shrunk down
the elephants or whales,or rhinos much.their still almost the same size as they always were...why would spiders be any different?
Originally posted by CynicalDrivel
I think the only thing that limits size is oxygen conversion. I'm not sure anyone's found out the what our present day levels of oxygen requires of
their Book Lungs?
1. Debateable. Largest found Mammoth skeleton is 5 meters/16 ft at the shoulder, which is larger than modern Elephants get. The Stegondon is at
the tallest end of the range at 4 Meters/13 ft. This is why the African Savannah Elephant is called the largest of all extant
with a shoulder height for bulls of 3.2-3.6 m. I can understand the reaction of "what's another metre, at that size", but there is a difference in
size from fossils to living examples.
2. I already posted the information on how Beetles can only get so big before the size of the required lungs prevents viability.
3. As I posted already, larger Dragonflies have been bred due to changing the oxygen ratios in labs.
4. I'm less inclined to compare a spider to an elephant than a Beetle or Dragonfly.
5. If someone did a study on the capacity of book lungs, they might be able to extrapolate just how big a spider could get, in our present day
atmosphere. If it works out the way it did with the Beetles, they already had found Beetles before that were at that maximum.
Now I will amend myself: I think the only thing that limits the maximum size is oxygen conversion.
That was faulty on my part, for the lack of conciseness.
But fossil evidence of how big Spiders were in the past is limited to very tiny spiders:
The largest spider ever observed by scientists was over 8 feet long and weighed in at 530 pounds. It was actually immobile though, it's
legs had been broken long ago by merely carrying its own weight
Where the heck they go this
information from, I have no idea...yet. Most namedropping crypto sties I've run across bring up: Reginald and Margurite Lloyd. They also put the
maximum size at about 5 feet, weighing over/around 500 pounds?