Plateosaurus engelhardti, P. gracilis

Source: http://markwitton-com.blogspot.com/2013/05/another-new-plateosaurus.html

Name: Plateosaurus engelhardti, P. gracilis 

Name Meaning: Broad Lizard

First Described: 1837

Described By: von Meyer 

Classification: Dinosauria, Saurischia, Eusaurischia, Sauorpodmorpha, Plateosauria, Plateosauridae

Plateosaurus is, arguably, the most famous saurpodomoprh (”prosauropod”), and is typically used as an example of what early members of the group looked like. It lived from about 214 to 204 million years ago, in the Norian to Rhaetian ages of the Late Triassic. It is known from multiple individuals, many of which are well preserved, and across a variety of age ranges. As such, it has been found in many sites across Europe. The original was found in Heroldsberg, near Nuremberg, Germany. It has also been found along the Neckar and Pegnitz river valleys, in Switzerland, and in France. Three localities especially yielded large numbers of specimens in good quality: near Halberstadt in Saxony-Anhalt, Germany; Trossingen in Baden-Württemberg, Germany; and Frick. It was also found in the Fleming Fjord Formation in Greenland, as well as from the Snorre Oil Field in the North Sea, making Plateosaurus the first dinosaur found in Norway. 

Source: http://themorlock.deviantart.com/art/Plateosaurus-engelhardti-305977259

Plateosaurus was one of the larger “prosauropods” (which is an antiquated term that typically applies to those saurpodomorphs that are not sauropods, however, that is not really an accurate term cladistically, but it still holds meaning to dinosaur enthusiasts, so… I use it?), ranging between 5 and 10 meters long, but the genus was actually very variable when it came to the size of adults. Its growth was initially rapid, continuing slowly beyond maturity, but it would stop growing once it reached a maximum size (around 10 meters long). However, this did really depend on the individual - some individuals were found to be fully grown at only 4.8 meters long. The rapid growth involved suggests that it may have been endothermic, or at least on the way to developing endothermy. It also had avian-style lungs, which further indicates that endothermy may have been present in this genus. The presence of avian-style lungs in a dinosaur that is not in the line that includes birds indicates that avian-style lungs may have been an ancestral trait for all of the saurischians, or even Dinosauria. This could, furthermore, indicate that all dinosaurs were in fact endothermic. Some individuals were fully grown at 12 years, other still grew slowly at 20 years, and others were still growing rapidly at 18. The oldest individual found at 27 was still growing.  

Source: sheriff-kyle, who drew this especially for ADAD! Thanks Kyle! Check them out!

It was obligately bipedal - so any reconstructions with it walking on all four are less than correct. This is not an uncommon phenomenon, however; every imaginable posture has been imagined for this animal. Two early investigators were at odds with one another: Von Huene assumed that it was bipedal and digitigrade (meaning, walked on its toes, like birds and theropods). Jaekel, on the other hand, though it was quadrupedal, with a sprawling limb position like lizards. Then, Jaekel changed this tune to clumsy, kangaroo-like hopping… which is… interesting… to picture… Starting in 1980, better understandings of dinosaurian biomechanics allowed for better understanding of its posture: the new interpretation was digitigrade, and a horizontal back, though it was still thought that it could be either bipedal or quadrupedal (for rapid and slow locomotion respectively). The tail was straight, which would allow for bipedal posture. However, detailed study of the forelimbs by Bonnan and Senter demonstrated that they could not be pronated (something, I would remind everyone, this dinosaur has in common with theropods, including raptors, aka animals that could not bend their wrists so their palms were facing their torsos). This would make it an obligate biped, which is further emphasized by how much longer the hind limbs were than the front limbs. 

Source: lythronax-argestes-the-gore-king, my friend! Check him out too! 

It had a small and narrow skull, rectangular in shape, and it had thick, leaf-shaped, serrated teeth, suitable for crushing plant material, indicating that Plateosaurus was herbivorous (rather than omnivorous, like earlier sauropodmorphs). It had a low jaw position, giving the chewing muscles great leverage, so it also had a powerful bite. It had eyes on the sides of its head, allowing it to have a wide field of vision to look for predators; it also had sclerotic rings, or bon plates that protected the eye. It’s large field of vision, however, came at a cost - it did not have binocular vision, and thus, poor depth perception. No juveniles or hatchlings are known for the genus, so it is unknown how the body changed during the initial 10 years of rapid growth. It has often been found alongside the shed teeth of theropods, indicating that it may have been hunted upon by them, or at least scavenged on (given its large size, and the relatively small sizes of early theropods). 

Source: thewoodparable (y’all know his work by now let’s be real)

No gastroliths have ever been found in association with Plateosaurus, which contradicts the idea that all large dinosaurs would swallow gizzard stones to digest food. The use of gastroliths for digestion developed from basal theropods to birds, with similar development in other species like Psittacosaurus. Comparing the scleral rings of Plateosaurus and modern birds has lead to the understanding that it may have been cathemeral, active throughout the day and night, though it may have avoided critical times during the day such as mid-day heat. Though it has never been found in association with them, given the ancestral character of protofeathers in Dinosauria, and its relatively small size and basal position compared to such sauropodomorphs as the titanosaurs (which were decidedly scaly), it is reasonable to suppose that Plateosaurus, like all basal sauropodomorphs, was covered in a coat of protofeathers. It is not clear whether or not it lived in herds, with no clear evidence either way. It may have travelled in loose herds, or congregated together based on food availability. 

Source: thewoodparable

Plateosaurus was one of the main herbivores present in Europe at the end of the Triassic, and was probably a commonly targeted prey species by large reptiles and even larger theropod dinosaurs. Herrerasaurus, though living in South America, did reach a size that could have allowed it to threaten animals like Plateosaurus, and given that South America and Europe were linked in the supercontinent Pangaea, it is possible that it did. There are two valid species of the genus: P. gracilis and P. engelhardti, the latter being the first described, though it is possible that there are more, given that the original find of P. gracilis has no skulls, and other assigned specimens have skulls and skeletal material that don’t overlap enough with the original to ensure that they’re all in the same group. P. gracilis was the older species, in the early Norian; whereas P. engelhardti was from the later Norian. This was a successful genus, with a wide range of habitats and a long time span of existence, and it is no wonder that it is one of our best known members of the early sauropodmoprh group.   

Sources: 

https://en.wikipedia.org/wiki/Plateosaurus

http://www.prehistoric-wildlife.com/species/p/plateosaurus.html

Shout out goes to kummakat!

Jurassic World Dinosaurs

Did no one other than me hear the line in Jurassic World that went something like “if you wanted these animals to be authentic, they would all look very different, but you wanted more teeth.” Or something. Dr. Wu actually says and acknowledges that the dinosaurs they’re making are not accurate. Yet everyone and their cousin complains about the dinosaurs and their authenticity. Everyone knows the Jurassic Park/Jurassic World dinosaurs don’t look like they actually would have. Even the movie points it out. Get your heads out of your asses and stop trying to be a know-it-all. You’re just making a fool of yourself. The movies are great and everyone with a brain knows the inaccuracy of the look of the dinosaurs. Just chill and enjoy it for what it is: a fun fictional movie.

A couple more prehistoric skull vectors. We’ve got 2 more extinct mammals tonight for everyone playing along at home. I know we had a little trouble last time with the mammal representative of the group but figured both of these are so specialized looking that it might be easier, and i’ll give you a clue. Only one of these is placental. #skull #vector #digital #digitalart #dailydigital #prehistoric #fossil #bones #mammals #extinct #art #arte #illustrator #adobe #artistoninstagram #killustrator #paleontology #extinctanimal #notadinosaur #marsupial #instaartsy #instadaily #animals #vectorart #paleoart

A Whale Inside A Whale, That Was Eaten By A Shark, Discovered In Egypt

t’s like a prehistoric turducken, but on a colossal scale: Scientists in Egypt have discovered the remains of a 40 million-year-old whale with another whale inside it, and researchers believe the two were then eaten by sharks.

The smaller whale found inside the fossils of the 60-foot-long basilosaurus may have been a fetus. However, basilosaurus had some pretty unusual dining habits. Like today’s orcas, this fierce and ancient predator was known to eat other whales, so the whale inside might not have been a fetus so much as a meal.  Read more

Be sure to follow the Fossil Porn Tumblr Blog for more fossils news, links and photos.

The now-iconic “stand down” scene from Jurassic World, with Blue, Charlie, and Delta portrayed here by some more-accurately sized Utahraptor ostrommaysorum. 

Due to the overwhelmingly positive popular response to my first “Scientifically Accurate Jurassic World” piece (http://lexiconmegatherium.tumblr.com/post/122169580525/scientifically-accurate-jurassic-world-feat) I just couldn’t help doing a sequel (plus in researching it I fell down the wiki-wormhole of current paleontological research and got the major urge to draw some dinosaurs, just like when I was a kid!). 

The Smithsonian National Museum of Natural History has just done The Internets proud and won the #JurassicZoo meme (previously featured here). They’ve got real dinosaurs, you see. Sure, they may be fossilized remains, but they’re still the real McCoy and Dinosaur Curator Matthew Carrano is clearly an expert at keeping those pesky prehistoric bones in line.

[via Smithsonian’s NMNH]

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New species of dinosaur, the regaliceratops, discovered in Canada

When fossil experts first clapped eyes on the skull, it was clearly from a strange, horned dinosaur. When they noticed how stunted the bony horns were, its nickname, Hellboy, was assured.

The near-complete skull of the 70 million-year-old beast was spotted by chance 10 years ago, protruding from a cliff that runs along the Oldman river south of Calgary in Alberta, Canada.

Painstakingly excavated, cleaned up and measured since then, the fossilised remains have now been identified as a relative of the three-horned triceratops, and the first example of a horned dinosaur to be found in that region of North America.

Continue Reading

Some 240 million years ago, this 8-inch-long critter lived in a large lake, in a fairly warm, subtropical climate. But it didn’t have the kind of shell modern turtles have, says Hans-Dieter Sues, a curator at the Smithsonian’s National Museum of Natural History in Washington, D.C.

“It has the real beginnings of the belly shell developing,” says Sues, “little rib-like structures beginning to fuse together into larger plates.”

More on this new species here.

image: Rainer Schoch/Nature

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Isn’t this little guy cute? Don’t you want one of your very own? Yes you do. I have this little guy over here. He’s cute too, but he’s only small. Now there’s a bigger one. Go get one.

Who doesn’t want their very own pet trilobite? Now you can have one too!

It’s easy to find plush models of large prehistoric animals like dinosaurs, mammoths, and saber-tooth cats. But here at the Paleontological Research Institution (PRI), we recognize that creatures both large and small are a huge part of life on Earth. Our wildly successful plushie line, Paleozoic Pals, was designed to bring lesser-known and lesser sized -yet just as important- fossil creatures to life for the community of scientists, students, and the public as a whole to enjoy.

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NEW SPECIES ALERT!

Oxford scientists have discovered the fossil remains of a six foot long lobster-like sea monster. It’s called Aegirocassis benmoulae (named after the Moroccan fossil hunter Mohamed Ben Moula who discovered the remains). It’s part of a group of species called “anomalcaridids” - giant plated arthropod ancestors who ruled the Cambrian and Ordovician seas (520 - 443 million years ago). FULL STORY HERE

Most of anomalcaridids were like sharks, hunting other sea creatures, but this new species is more like a baleen whale. It used spines on its head to filter sea water and trap tiny particles of food.

Images:

  • A reconstruction of the Aegirocassis benmoulae by Marianne Collins/ArtofFact.
  • The Aegirocassis’s spiny net filter that it used for feeding.
  • Allison Daley, one of the scientists who described this new species, at a dig.