This may have passed under most of our radars, but for more than a century most paleontologists have considered the "brontosaurus" to be merely an immature apatosaurus. (Why didn't they think that an "apatosaurus" was merely a mature brontosaurus?). But the persistence of the term "brontosaurus" in popular culture appears to have been uncannily prescient, as a recent re-analysis of a wide range of samples of the genus has provided evidence that the two were in fact separate species.

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Bone-tastic boffins' breakthrough BRINGS BACK BRONTOSAURUS
They're REAL, say dino doctors
7 Apr 2015 - Iain Thomson

The brontosaurus, loved by kids the world over but cruelly snubbed by paleontologists for more than a century, is back. British and Portuguese fossil boffins have concluded the dinosaur existed as a separate genus after all.

It was back in 1879 that paleontologist Othniel Charles Marsh named a collection of bones a brontosaurus, or Thunder Lizard, and described a massive herbivore with a long neck and tail that wandered across the plains of what is now America.

But within a couple of decades the existence of the Thunder Lizard was called into question, and the scientific community decided that the stumbled-upon brontosaurus was just an adolescent apatosaurus. There then followed a 100-year campaign to expunge the word brontosaurus from textbooks, but the name proved just too popular.

Now a study looking at the largest range of fossils of the genus has shown that the brontosaurus was a distinct genus. While the dino does have strong similarities to the apatosaurus, there are enough differences to separate the two, the study's authors concluded.

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http://www.theregister.co.uk/2015/04/07/brontosaurus_is_back/