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Titanic

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Amphicoelias, possibly the largest sauropod and largest animal yet discovered, shown with two of the largest mammals alive today. The Blue Whale at a massive 28 meters long and weighing ~140 metric tons, and the Asian elephant at 3m tall and ~4 tons in mass.

Edit: I redid this scale with a more accurate reconstruction of Amphicoelias. Still seemingly the largest animal ever at about 70 meters long. Only known from one dorsal vertebra estimated to be about 9 feet tall, scaling from related sauropods gives numbers clustering in the 65-75 meter range. At the size I depict here a likely weight would be around 175-195 metric tons (Assuming slightly higher pneumaticity than seen in Diplodocus). Recent studies show that sauropod necks tend to lengthen to the power of 1.35 in comparison to smaller relatives. Since diplodocus had a ~6.5-7 meter neck, Amphicoelias could have had a neck 2.5^1.35 times as long....That's over 20 meters of neck! The only possible contenders to Amphicoelias's size are the Blue Whale and the very poorly known Broome Titanosaur.

All scaling is imprecise and based on Amphicoelias assuming similar proportions to Barosaurus and Diplodocus.
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Jimbowyrick1's avatar
With only a single vertebra found, from such an immense animal, you'd think that there would be nearly complete skeletons found.
The bones would simply be too heavy for scavengers to drag around!
After the meat's been stripped, nature would cover over this long mass of bones, taking her time doing it, until we come along and find the darned thing.
For there to be only one vertebra means that the intact skeleton, at some point, was torn to pieces by, perhaps, powerful floods, or some other mechanism that nature would demonstrate.
Anyway, Cool gallery and science education!
I hope that you are successful in having a career in science, that benefits the world.