Throwback Thursday: The Curious Case of Brontosaurus
Everyone has heard of Brontosaurus. It's one of the top five dinosaurs kids learn. However, do you know about the rocky past of this fan favorite? Brontosaurus was discovered in 1879 by Othniel Charles Marsh (or at the very least, his crew) during the height of the infamous Bone Wars. It was collected from Como Bluff, Wyoming and it was a nearly complete skeleton. All it was missing was its head (a typical, sauropod problem).
At this time, the Morrison Formation was at the center of the Bone Wars conflict so Marsh was feeling rushed and pressured to publish on this new find before his rival, Edward Drinker Cope, had the opportunity to publish something new first. Even though he hoped to recover a skull, Marsh opted to publish without.
Now, the Yale Peabody Museum couldn't display a headless skeleton so they decided to sculpt one. As I mentioned before, sauropod skulls are not easy to come by. The damn things are so small compared to the rest of the body and so fragile that the pop off and disarticulate. The only skulls that had been found with any substance was Camarasaurus and a few Brachiosaurus fragments. I mean, look at the size difference between Camarasaurus and Diplodocus skulls:
(The Diplodocus skull is significantly smaller. You can see it below and to the right of the Camarasaurus in the top photo).
So, all they had to really go off of was Camarasaurus and Brachiosaurus so they made a composite of the two that ended up looking like this:
Horrifying, isn't it? I mean, those two sauropods aren't even closely related to Brontosaurus.
In 1903, Elmer Riggs argued that Brontosaurus was not different enough from Apatosaurus to warrant a different genus. A different species, sure, but not genus. Since Apatosaurus was named first, it had priority therefore Brontosaurus excelsus became Apatosaurus excelsus. However, the general public missed the memo so Brontosaurus stayed in common literature.
In 2015, an extensive study was done on the diplodocid branch (check out my Monday Musings post on sauropod phylogeny if unfamiliar with sauropod families) and they concluded that Brontosaurus was legit. Usually, names don't get revived to keep things from getting confusing but Brontosaurus survived nearly 100 years of existential crises so its popularity in the general populace allowed for a revival.
And that is the short history of how Brontosaurus existed then didn't exist and then existed again. Tune in tomorrow to learn about Brachiosaurus altithorax.