Charonosaurus

Charonosaurus is one many different Hadrosaur, or "Duck-Billed" species. It was discovered relatively recently, with the first fossils uncovered in 2000.

Charonosaurus is named for Charon of Greek Myth, the ferryman who carried souls across the river Styx. The Fossils were found on the banks of a river, inspiring the name. They lived between 67 and 65 million years ago, going extinct during the event at the end of the Cretaceous.

Only a few bones have been found of this Dinosaur-- most notably a partial skull. Though we don't have a full skeleton, we can use ratios found in relative Hardosaurs and determine Charonosaurus's size. They were one of the largest members of their family, and could grow as long as 33, possibly 40 feet!

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Status : Extinct, Lived 67-65 million years ago
Location : China and Russia
Size : Length up to 33ft (10m)
Classification : Phylum : Chordata -- Clade : Dinosauria -- Order : †Ornithischia
Family : †Hadrosauridae -- Genus : †Charonosaurus -- Species : † C. jiayinensis
Image : Carnivora Forum

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Triceratops

Triceratops is one of those iconic Dinosaurs, everyone recognizes it! These four-legged herbivores were discovered by Othniel Charles Marsh during the famous late 19th century "Bone Wars," and their fossils have been found in various deposits in western North America.

Triceratops

Triceratops is a genus name that encompasses three different species, with Triceratops horridus being the most well known. They measured as long as 30 feet from nose to tail tip, and could weigh well over 20,000lbs.

These Dinosaurs were named for the three horns on their skulls. These horns, and the large bony neck frill behind them, were probably used for defense. And Triceratops certainly had a lot to defend against-- these guys lived at the end of the Cretaceous, in about the same time and place that T. Rex and other very large, very powerful predators lived!

Aside from defense, the horns and neck frill may have served a purpose in during mating season. The neck may have even helped to regulate body heat!

Triceratops lived up until the very end of the Cretaceous, and died out along with all of the other Dinosaurs that were around for the K-T Extinction Event.

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Status : Extinct. Lived 72-65 million years ago
Location : North America
Size : Length up to 30ft (9m), Weight up to 26,000lbs (12 tonnes)
Classification : Phylum : Chordata -- Order : †Ornithischia
Family : †Ceratopsidae -- Genus : †Triceratops
Image : Nobu Tamura , Minnesota Jones

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Barosaurus

80 different Dinosaurs were discovered by Othniel Charles Marsh during the "Bone Wars" and Barosaurus was one of them.

This relative to the more famous Diplodocus lived during the Upper Jurassic, between 155 and 145 millions years go. Its fossils were first uncovered by Marsh in 1889, and parts have been found in various western American states.

Barosaurus was a very long Dinosaur-- adults could reach more than 80 feet from head to tail, and weight upwards of 40,000lbs. Their necks alone stretched to 30ft! That's almost two giraffes!

The neck of a Barasaurus raises some questions about how this Dinosaur's circulatory system worked. If they held their neck straight up it would require an abnormally massive heart to pump blood all the way to the brain. There are theories that Barosaurus either had secondary heart-like structures in its neck, to help move the blood upwards, or they kept their necks parallel to the ground. However, it is difficult to prove either theory-- soft tissue does not exist for these creatures, and the fossilized vertebrae suggest that the Sauropod did stand with its neck stretching upwards. Either way, very interesting things to think about!

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Status : Extinct 145 million years
Location : North America
Size : Full length up to 85ft (26m), Weight up to 44,000lbs (20 metric tons)

Classification : Phylum : Chordata -- Clade : Dinosauria -- Suborder : †Sauropodomorpha
Family : †Diplodocidae -- Genus : †Barosaurus -- Species : † B. lentus

Image : Debivort, Ryan Somma

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Carnotaurus

Carnotaurus sastrei

The Carnotaurus is a popular Dinosaur due to its large size (up to 30ft long) and interesting appearance. They had very straight, muscular bodies that allowed them to run quickly, as well as distinctive horns over their eyes.

And yes, that painting is correct-- Carnotarus had tiny arms. Absolutely, minuscule! They make a T. Rex's look huge by comparison! These itty bitty arms were probably function-less, having the same reduced nerve fibers found in the tiny useless wings of flightless birds like Emus.

Carnotaurus lived before the T. Rex, about 72-70 million years ago, during the Late Cretaceous. Their fossils have been found in Argentina, and were only discovered back in 1984. Interestingly, Carnotaurus was the very first Theropod Dinosaur to give us fossilized skin impressions. We know that they were covered in scales, as well as knobby bumps that ran down the back. They were also absent of feathers.

There is some disagreement over what Carnotaurus ate. While it is accepted that they were very fast, and could run down prey, there is dispute over what the prey was. Some argue that their bite strength was low, but the movement was quick, and that they probably captured small creatures and swallowed them whole. Others suggest that their bite was actually very strong, and would've been used to repeatedly attack larger prey. Publications have been going back and forth on this topic for over 15 years.

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Status : Extinct for 70 Million Years
Location : South America
Size : Length up to 30ft (9m)

Classification : Phylum : Chordata -- Clade : Dinosauria -- Clade : Theropoda
Family : †Abelisauridae -- Genus : †Carnotaurus -- Species : † C. sastrei
Image : Nobu Tamura, Ghedoghedo

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