Greetings from New Mexico! This week we shall be checking out an animal that Gary and I actually work with and dig up in the field. Introducing Typothoraxcoccinarum! Typothorax was not a dinosaur, but a relative of modern crocodilians, called an aetosaur. It was closely related to its fellow aetosaur, Desmatosuchus, and more distantly toPostosuchus and Shuvosaurus. Typothorax lived 200 million years ago during the late Triassic period in what is now the Southwestern United States. It would have been mostly a plant-eater and measured about eight feet long from snout to tail. When alive it would have coexisted with other Triassic reptiles like Redondasaurus,a still unnamed species of Shuvosaurus, and the dinosaur,Coelophysis.
Typothorax coccinarum life reconstruction by Christopher DiPiazza.
Typothorax, like all known aetosaurs, possessed a body that was covered in broad plates of bony armor, called scutes. These scutes were similar to what we see on modern crocodilians, but they were much broader and covered more surface area of the aetosaur's body. Typothorax had two rows of wide, rectangular plates running down the surface of its back, small, shallow spike-shaped scutes lining the sides, smaller scutes covering its belly, jagged scutes on the tail, and tiny, almost square-shaped armor bits on its legs. It wouldn't have been able to move very quickly because of all this but hey, when an animal is that well protected, it had little need to. It even had a series of small armor plates surrounding its cloaca! (reptilian equivalent of a butt hole)
Typothorax armor and limb bones on display at the Mesalands Dinosaur Museum in New Mexico.
Typothorax had a narrow snout that was upturned at the tip, somewhat like a modern pig's nose. This suggests that it may have plowed around in the earth with its snout for roots and possibly insects for food. The proportions of its arms, which possessed shorter forearms and were angled to the sides, also suggests that it was a powerful digger.
Back armor plat from a juvenile Typothorax about to be collected from the field.
In the field, remains from Typothorax are some of the more common fossils that we find in the Redonda Formation. Of these, we most commonly get pieces of armor plating. Last year our team found a scute from a Typothorax's back that was about a foot wide! Hopefully this year we will find more fossils from this amazing reptile!
Heckert, A. B.; Lucas, S. G. (1999). "A new aetosaur (Reptilia: Archosauria) from the Upper Triassic of Texas and the phylogeny of aetosaurs". Journal of Vertebrate Paleontology19 (1): 50–68. doi:10.1080/02724634.1999.10011122.
Martz, J.W. 2002. The morphology and ontogeny of Typothorax coccinarum (Archosauria, Stagonolepididae) from the Upper Triassic of the American southwest. M.S. thesis, Geosciences, Texas Tech University, Lubbock, 279 pp.
Last month I had the pleasure of visiting London, England, for a second time. Did you know that England is where the very first dinosaur to be recognized by science was discovered? Of course you did! You also probably know which one it was too... Megalosaurus. Anyway, I got to visit a lot of nice places, including some great natural history museums as well as meet up with some of my friends whom you may recognize if you visit this site often. I also am a big fan of fish and chips. I'm an even bigger fan of eating them.
Pretty much my attitude every time I got hungry over there. Baryonyx (a fish eater) and Hypsilophodon (a plant eater, maybe a digger of roots) were both discovered in what is now England.
and I did.
The first place I made a point to visit was the London Museum of Natural History, home to the first Diplodocus skeletal mount right in the middle of the entrance hall. I met my friends, Marc Vincent, who writes for Love in the Time of Chasmosaurus, Niroot Puttapipat, one of the most talented and skilled illustrators of our time (I know when he reads this he is going to be all modest and probably tell me to take it off but I really do mean it. If you haven't checked out his work yet you should do it...right now. Also get ready to have your jaw hit the floor because that's totally gonna happen when you see his art for the first time.), and Dr. Adam Smith, a paleontologist who specializes in plesiosaurs. Fun trivia fact: I actually met all these guys about six years ago on Adam's site that reviews dinosaur toys, called The Dinosaur Toy Blog.
From left to right: Niroot, Marc, Adam, and I at the London Museum of Natural History last month.
Sharing a laugh with Charles Darwin in the main hall.
Dr. Smith reflects with one of his subjects.
This past time that we visited there was a seasonal exhibit about mammoths and other ice age megafauna. there were a number of interesting fossil specimens and artifacts but almost just as interesting was the artwork in the form of life reconstructions of these animals.
Life-size model of a Colombian Mammoth.
There were some pretty cool interactive exhibits too.
There are a lot of other awesome natural history museums I got to see too though. Most notably was the seemingly small, but surprisingly extensive, Booth Museum of Natural History in the town of Brighton. This place was literally wall to wall with taxidermy bird specimens. It was really very impressive.
I swear it was like the TARDIS. Bigger on the inside.
They also had some nice Iguanodon and Mantellisaurus fossils!
On my last day there I had the privilege of visiting the Grant Museum of Zoology in London. This is a small place, the building sort of reminds me of the New Brunswick Geology Museum back home, but it is wall to wall, jam packed with all kinds of animal specimens, including taxidermy, specimens in formaldehyde, and especially skeletons. Lots and lots and lots of bones all over this place. If you are ever in London and were wondering what the skeleton of...anything off the top of your head looks like, give this place a visit.
Hello, family!
Below is a photo of Marc, Niroot, and myself in our matching dinosaur family crest shirts (if by nerdy you mean totally cool then yes, you would be correct.) illustrated by David Orr. Wait, who is that on the right there? It's Katrina Van Grouw! If you don't know, she wrote and illustrated The Unfeathered Bird, one of the best zoological books (if not the best) of 2013. (If you like birds or are interested in learning more about them definitely pick up a copy. The book is a must-have for professionals and hobbyists alike.) Katrina also used to be the curator or ornithology at the London Museum of Natural History. I was thrilled that she took the time out of her schedule to come out to see us and of course to have her sign my copy of her book.
That is all for today. I got to visit a few other REALLY special dinosaur-related places while I was there but I decided to give those their own posts in the future. One place was very OLD and one place was very NEW. Farewell until next time!
Today we will be looking at another exciting, newly-discovered dinosaur with a beautifully unique frill! Enter Mercuriceratops gemini! Only formally described this year, Mercuriceratops was a plant-eating dinosaur that lived in what is now Alberta, Canada and Montana, USA. it lived during the late Cretaceous period, 77 million years ago and measured about twenty feet long from beak to tail. It's genus name, Mercuriceratops, translates to "Mercury Horned Face". This is in reference to the Roman messenger god, Mercury, who was able to fly thanks to the wings on his helmet. Mercuriceratops also had "wings" or rather extra wing-shaped structures on the sides of its bony frill. What an appropriate name! The species name, gemini, was given because Mercuriceratops is known from two nearly identical specimens, one from Montana, and the other from Alberta. Each fossil, although from different individual animals that died in different places, are from the exact same parts of each specimen's frill! Maybe they called each other the night before and arranged it that way?
Life reconstruction of Mercuriceratops gemini by Christopher DiPiazza.
Mercuriceratops belongs to the subfamily of ceratopsid dinosaurs (beaks, horns, and frills) called chasmosaurinae. These members of the ceratopsid family are characterized by their longer frills and normally narrower snouts. Other examples of chasmosaurine ceratopsids are Chasmosaurus, Coahuilaceratops, Vagaceratops, and Triceratops. Mercuriceratops' fossils are the oldest of any chasmisaurine to ever be discovered in Canada.
Image of the fossils from Montana and Alberta which would have been parts of Mercuriceratops' frill from the paper by Michael Evans, formally describing the new species.
There are a lot of unique horn styles amongst ceratopsids that have been discovered over the years but Mercuriceratops is the only one known to have a frill that was this unique. During the late Cretaceous (specifically the Campanian age, spanning from about 83 to 72 million years ago) there have been dozens of amazing ceratopsids discovered which tells us that whatever the environment was like back then, it definitely favored the horned dinosaurs and prompted an explosion of biodiversity amongst them. Each species would have used a unique horn/frill shape (and probably colors too) to attract mates and communicate with each other within the species. We can see similar biodiversity in Africa, with all the different kinds of gazelles and their differently-shaped horns. If you want a closer related modern example, just check out all the different kinds of related birds in any given ecosystem and how they all showcase different coloration and songs for the same evolutionary reasons. Sadly, so far only parts of Mercuriceratops' frill have been discovered and the exact shape of its horns is still a mystery.
That is all for this week! Feel free to comment below or on our facebook page! When you hear from me next week I will be posting from New Mexico, doing fieldwork, excavating Triassic fossils!
Works Cited
Ryan, M. J.; Evans, D. C.; Currie, P. J.; Loewen, M. A. (2014). "A new chasmosaurine from northern Laramidia expands frill disparity in ceratopsid dinosaurs". Naturwissenschaften. doi:10.1007/s00114-014-1183-1.
This week we will take a look at a dinosaur who's remains completely changed the way we looked dinosaur parenting. Check out Citipati osmolskae! Citipati was an oviraptorid theropod that lived in what is now Mongolia during the late Cretaceous, roughly 75 million years ago. It was a fairly large oviraptorid, measuring about ten feet long from beak to tail, and would have eaten meat and possibly some plant material as well. Citipati's habitat would have been a desert where it coexisted with other dinosaurs such as Protoceratops, Velociraptor, and Oviraptor.
Citipati family goes for a stroll. Mom leads the way while Dad takes up the rear, making sure none of the kids do anything stupid.
The name, Citipati, translates to "funeral pire lord" and is a reference to a Tibetan folk story. In the story, two monks were decapitated while they were meditating. Often times these two monks are depicted in traditional Tibetan art as two skeletons dancing around in fire, called citipati. Citipati, the dinosaur, is known from many beautifully preserved skeletons and is named in reference to these depictions.
Even in death these guys kept partying. Good for them.
Citipati was an oviraptorid and belonged to the same general family as Oviraptor and Anzu. Like them, it had a short snout and tall beak. This beak would have been backed up by extremely powerful muscles which would have enabled this animal to bite down HARD in life. Like its relatives it possessed no teeth in its mouth, but it did have pointed bone structures on the roof of its mouth that were used to crack...something. It had a particularly long neck and short tail amongst other members of its family. It also had a bony crest on the front of its snout. In life, Citipati, would have had feathers.
Famous brooding Citipati fossil display at the American Museum of Natural History in New York. You can make out how the animal would have been sitting with its legs folded in the middle and its arms spread over the eggs when it died.
So what exactly can we gather from this Citipati fossil? Like I stated before, upon looking inside some of the eggs, and by comparing them to other eggs that have been found in the area, it was concluded that Citipati and its kin were caring parents and totally undeserving of their "egg thief" name. (Although they may have eaten the eggs of other dinosaurs too even though no evidence suggests it as of now...eggs are nutritious!) It also solidified the modern bird's connection to other dinosaurs thanks to the pose this parent had died in. The last bit of information wasn't so obvious. If you look at the fossil, you will notice that the parent's body with the arms out to the sides still doesn't completely cover the eggs as it is. If it had arm feathers, however, all the eggs would have been perfectly guarded under a nice, plumed roof...just like modern birds. This fossil, even though no actual feathers were preserved, brought us that much closer to the eventual realization that many theropod dinosaurs had feathers in life.
So what does this all have to do with Fathers Day? Well, it is often assumed that the Citipati sitting on the nest was a female. But what if it was the male? There sadly isn't any evidence that favors the adult specimen being either sex. If we look at living dinosaurs that have similar lifestyles as Citipati may have had, however, we do see some hints. I'm talking about large flightless birds like ostriches, emus, cassowaries, and rheas. (I actually get to see rheas every day at work at the zoo. They are nothing short of living dinosaurs!) Many of these kinds of birds are what we call polyandrous. That means one female will mate with multiple males. In the case of both ostriches and rheas, it is the males who build nests. Then the female goes around to each one and deposits some eggs. (not all of which are necessarily from that particular father) Each father then proceeds to brood the clutches much in the same way the Citipati was found doing to its own millions of years ago. When the babies hatch out, father raises them until they are old enough to be independent. Yay for dinosaur dads!
That's dad! The male ostriches have the striking black and white feathers. Females are brown.
Am I saying that the Citipati found on the nest was definitely a male? No. I am saying that we don't know and assuming it was dad and not mom is as good a guess as any right now, especially when you look at the modern evidence.
That's all for this week! Happy Fathers Day to all the dads out there! If you have any requests or comments please do so below or on our facebook page!
References
Clark, J.M., Norell, M.A., & Barsbold, R. (2001). "Two new oviraptorids (Theropoda:Oviraptorosauria), upper Cretaceous Djadokhta Formation, Ukhaa Tolgod, Mongolia." Journal of Vertebrate Paleontology21(2):209-213., June 2001.
Norell, M.A., Clark, J.M., Chiappe, L.M., and Dashzeveg, D. (1995). "A nesting dinosaur." Nature378:774-776.
Norell, M. A., J. M. Clark, D. Dashzeveg, T. Barsbold, L. M. Chiappe, A. R. Davidson, M. C. McKenna, and M. J. Novacek (1994). "A theropod dinosaur embryo, and the affinities of the Flaming Cliffs Dinosaur eggs." Science266: 779–782.
Osborn, H.F. (1924). "Three new Theropoda, Protoceratops zone, central Mongolia." American Museum Novitates,144: 12 pp., 8 figs.; (American Museum of Natural History) New York. (11.7.1924).
Varricchio, D.J. (2000). "Reproduction and Parenting," in Paul, G.S. (ed.). The Scientific American Book of Dinosaurs. New York: St. Martin's Press, pp. 279-293.
This week's prehistoric animal was requested by our good friend, Joe! Check out Quetzalcoatlus northropi! If Tyrannosaurus rex was the king of the dinosaurs, then Quetzalcoatlus was definitely the king of the pterosaurs. Not only was Quetzalcoatlus likely the largest pterosaur, but it was also likely the largest animal to ever fly! Its wingspan was up to thirty six feet wide and while standing on the ground it could have stood between fifteen to twenty feet tall! It would have been able to stare a Tyrannosaurus rex in the eye (Right before getting its head chomped off but that's besides the point.) It lived in what is now Texas, USA, during the late Cretaceous, 68 million years ago. When alive, it coexisted with many dinosaurs such as Ankylosaurus, Anatotitan(Edmontosaurus), Dracorex, Pachycephalosaurus, Anzu, Troodon, Triceratops...*BREATH*...and Tyrannosaurus during a time within the Cretaceous called the Maastrichtian era. The genus name, Quetzalcoatlus, is in reference to the ancient Central American god, Quetzalcoatl who took the form of a feathered snake. (strangely not the weirdest mythical creature I have heard of) Feathered snake...flying snake...flying reptile...pterosaur...sounds good to me! The species name, norhtropi, is in reference to Jack Northrop, the man who's company made large, tailless air crafts which sort of look like giant pterosaurs.
Quetzalcoatlus northropi by Christopher DiPiazza.
Now here's the thing about Quetzalcoatlus...See, all that stuff up there I just told you? All the measurements like wingspan and height? I bet you think we have plenty of fossils to work with from this guy. How could we not? It is easily one of the most popular pterosaurs by far. In actuality the big Quetzalcoatlus northropi is only based on one left wing discovered in the 1970s...that's it. Everything else we think we know about this animal is based on fossil material that has been gathered over the years from related species. There is another species of Quetzalcoatlus that was a great deal smaller that has some skull material, and then there is a related animal, called Hatzegoptyeryx, from Europe that scientists believe was very similar to Quetzalcoatlus. (Some believe that the two may even be the same species.) So everything that I am going to tell you in this post is actually educated guesswork based on material from all over the world! Did that hurt? I know, I'm sorry. This is even worse than finding out Santa wasn't real. If you look at artwork of Quetzalcoatlus starting in the 70s you will see drastic changes in the animal's image as the years go on based on new fossil material that was discovered and applied along the way from related species.
Quetzalcoatlus arm on display at the American Museum of Natural History.
Quetzalcoatlus belonged to a family of pterosaurs called Azhdarchidae. These were the last and largest pterosaurs to exist before going extinct sixty five million years ago. They also had some of the oddest proportions of any animal. The heads possessed large, toothless beaks at the end of long, stiff necks. Their bodies were proportionally tiny, only about a third the length of their heads! Their wings were also proportionally shorter when compared to those of some other large pterosaurs (the wing finger was less than half the length of the whole arm), but they were still able to fly quite well. They also likely had crests on their heads considering that so many other pterosaurs had them, but the exact shape is unknown. According to what we think we know, Quetzalcoatlus would have been a predator in its environment, hunting small animals like mammals and small dinosaurs. Despite its ability to fly, it would have also been very comfortable walking on the earth on its four stilt-like limbs. It may have stalked along the ground, striking any prey with its massive beak much like modern storks, hornbills, and herons do today. However, the neck of an azhdarchid was not very flexible, and the motion was probably more similar to that of a dipping bird toy...a twenty foot tall dipping bird toy from hell!
Sketch of Quetzalcoatlus walking.
Like I said earlier, Quetzalcoatlus did fly. You may be wondering how an animal that big was able to ever get off the ground, though. In fact, only a few years ago there was a proposal by some paleontologists saying Quetzalcoatlus and some of its relatives were actually flightless. This was later proven to be wrong, however. See, the arm bones of Quetzalcoatlus were extremely robust and would have anchored HUGE muscles on the chest, back, and bicep areas (experts think about 110 lbs of muscle in these areas to be exact). We actually see this in a lot of pterosaurs and even modern analogs like bats and birds. Why would an animal still have all that extra muscle in those places if it wasn't flying? As it turns out, using the latest technology and fossil information, it was found that Quetzalcoatlus would have actually been a really good flyer, able to stay aloft for several days at thousands of feet above the ground! The way it would have taken off from the ground also lies in its arms. Unlike birds, who use their hind legs to launch themselves into the air, pterosaurs had four limbs to do this with, so that's more power right there. Paleontologists theorize that a taking off Quetzalcoatlus would have looked like someone playing leap frog or pole vaulting. Check out this video below. The model isn't Quetzalcoatlus, but it gives the same idea.
That's all for this week! Hope you enjoyed the largest, yet mysterious, pterosaur! If you have another request feel free to comment below or on our facebook page! Also special thanks to Dr. Mark Witton for providing his expert insight on this most grand of pterosaurs!
References
Henderson, D.M. (2010). "Pterosaur body mass estimates from three-dimensional mathematical slicing." Journal of Vertebrate Paleontology, 30(3): 768-785. doi:10.1080/02724631003758334
Kellner, A.W.A., and Langston, W. (1996). "Cranial remains of Quetzalcoatlus (Pterosauria, Azhdarchidae) from Late Cretaceous sediments of Big Bend National Park, Texas." Journal of Vertebrate Paleontology, 16: 222–231.
Witton, Mark P., and Michael B. Habib. "On the Size and Flight Diversity of Giant Pterosaurs, the Use of Birds as Pterosaur Analogues and Comments on Pterosaur Flightlessness." Ed. Vincent Laudet. PLoS ONE 5.11 (2010): E13982. Web.
Witton, M.P., Martill, D.M. and Loveridge, R.F. (2010). "Clipping the Wings of Giant Pterosaurs: Comments on Wingspan Estimations and Diversity." Acta Geoscientica Sinica, 31 Supp.1: 79-81
If you hadn't noticed, I skipped a week. I was in London and didn't have access to a computer, sadly. I would normally apologize but then I would be dishonest, teehee! (London was so fun. More on that in the near future.) This week, in honor of my trip, we shall be checking out a dinosaur that is famous (sort of...you will see what I mean just keep reading) for being native to what is now England. Check out Mantellisaurus atherfieldensis! Mantellisaurus was a plant-eating, ornithopod dinosaur that lived in what is now Southern England during the Early Cretaceous period about 130 million years ago. It measured about thirty feet long from snout to tail and would have walked on its hind legs most of the time. It may have dropped to all fours occasionally when resting.
Mantellisaurus atherfieldensis reconstruction by Christopher DiPiazza.
Mantellisaurus used to go by a much more recognizable genus name, Iguanodon. During the 1800s and early 1900s most any large ornithopod found in Europe was given the genus name, Iguanodon. It wasn't until years later that the specimens assigned to Iguanodon were examined more closely and several different kinds of related animals were able to be differentiated within this wastebasket of a genus. One of these was Mantellisaurus. Don't worry, the popular Iguanodon still stands. In fact, the animal now officially holding the name, Iguanodon, has remains found in England, as well. The best, most complete specimens of this particular genus are all from Belgium, however. The two animals are very closely related and both had the trademark thumb spike on their hands for defense or combat within their species. Mantellisaurus differs, however, in that it has much shorter front limbs than back limbs, and likely spent most of its time as a biped. Iguanodon, on the other hand, actually had very long arms and was probably adept at roaming around on all fours. Most reconstructions in books and other media that are labelled as "Iguanodon" are actually based on Mantellisaurus. (especially those made before 2007 when Mantellisaurus was officially named)
Mantellisaurus skeletal mount at the London Museum of Natural History.
Mantellisaurus was named in honor of Doctor Gideon Mantell, who was first to discover its (or Iguanodon's?) remains back in the 1800s. It was Mantell who came up with the name, Iguanodon, which translates to "iguana tooth", due to the dinosaur's teeth resembling that of the modern lizard's. Like many species of iguana, Mantellisaurus would have used its teeth to shred plant material. It also had a tough beak in the front of its mouth for clipping. Its hands, in addition to the thumb spike, had three wide middle digits for walking/standing on, and a flexible pinky digit, that may have helped manipulate vegetation while foraging. It is because of this variety of different kinds of digits that dinosaurs in the iguanodontid family are said to have had "Swiss army knife hands" by paleontologists.
Remains, tracks, and casts on display at the Booth Museum in London. These are labelled as belonging to Iguanodon but many, most notably that skull cast, are actually from Mantellisaurus. (which was still included in the Iguanodon genus at the time this exhibit was set up)
That is all for this week! As always feel free to comment below or on our facebook page! Stay tuned for some coverage of my trip to London and all the dinosaur-related adventures that went down!
References
Hooley, W., 1925, On the skeleton of Iguanodon atherfieldensis sp. nov., from the Wealden Shales of Atherfield (Isle of Wight): Quarterly Journal of the Geological Society of London, v. 81, p. 1-61.
Paul, Gregory S. (2008). "A revised taxonomy of the iguanodont dinosaur genera and species". Cretaceous Research29 (2): 192–216. doi:10.1016/j.cretres.2007.04.009.
Today is the 215th birthday of Mary Anning! In case you didn't know, Mary Anning was one of the most important early fossil hunters in history. Starting when she was just a child, she was responsible for the discovery of several important species. She lived in Southern England and used to do all her hunting along the Jurassic fossil beds known as the Lyme Regis formation.
Mary Anning discovered well known species like the pterosaur, Dimorphodon, and the first known plesiosaur and ichthyosaurs to science!
Ichthyosaurus, a famous prehistoric reptile discovered by Mary Anning back in the 1800s.
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