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About Seismosaurus:
Paleontologists sometimes refer to a "deprecated genus"--that is, a creature that was once thought to be unique, but has since been shown to belong to an already existing genus. Such is the case with Seismosaurus: once considered the biggest of all dinosaurs, scientists now agree that this house-sized herbivore was probably a type of Diplodocus.
It's also possible that Seismosaurus wasn't quite as big as was once assumed. Some researchers think this dinosaur weighed as little as 25 tons and was considerably shorter than 120 feet, though not everyone agrees with these drastically scaled-down estimates.
The extreme length of Seismosaurus' neck raises an interesting question: could this 's heart possibly have been strong enough to pump blood all the way to its head? If not, it's likely that Seismosaurus held its neck roughly parallel to the ground, rather than in the vertical position.
