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Dinosaur of the Day


frogfish

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The Dinosaur of the Day is:

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Achelousaurus

Achelousaurus horneri

Pronounced:

Diet: Herbivore (Plant-Eater)

Name Means: Achelous Lizard

Length: 20 feet (6 m)

Height: 8 feet (2.7 m)

Weight: unknown

Time: Late Cretaceous - 75 MYA

Location: N. America

Achelousaurus is a relative of another frilled ceratopsian dinosaur, Pachyrhinosaurus. They shared the same strange lump of bone on their nose, called a boss. This bony lump was positioned where other frilled dinosaurs, like , had their nose horns.

Achelousaurus was a fairly large plant-eating dinosaur that looked similar in body type to the other larger members of its North American family. There is ongoing discussion as to whether this dinosaur warrants its own genus. There seems to be ongoing speculation that it is a species of Pachyrhinosaurus, perhaps showing gender differentiation. Most likely, it will take a more complete specimen to settle the debate. It is at present considered by many to be somewhere between the Pachyrhinosaurus and Einiosaurus.

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Good idea for a thread, :tu:.

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Acanthopholis

Acanthopholis horridus

Pronounced: a-kan-THOF-o-liss

Diet: Herbivore

Name Means: "Thorn Scale"

Length: 6 feet

Height: 8 feet

Weight: Unknown

Time: Middle Cretaceous - 120 MYA

Location: Europe

Acanthopholis was an armored dinosaur discovered in England in 1867. Acanthopholis was a plant eater whose head, neck, back, and tail were covered with armored plates, called scutes. The scutes on this dinosaur were pointy and would have protected the animal from meat-eating predators.

Named by Thomas Huxley, one of the most prominent scientists and thinkers of 19th century Europe, Acanthopholis has had a somewhat controversial history. It was probably slightly smaller and lighter than its North American nodosaur relatives.

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Not to be rude Raptor, but could you be as kind to also post a picture?

Thanks

Rinchenia

Rinchenia mongoliensis

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Pronounced: rin-Chen-ee-uh

Diet: Carnivore (Meat-Eater)

Name Means: Rinchens

Length: 8 feet (2.5 m)

Height: 4 feet (1.3 m)

Weight: 300 pounds (136 kilos)

Time: Late Cretaceous - 70 MYA

Location: Asia

Rinchenia looked exactly like an Oviraptor. In fact, many scientists believe that it was an Oviraptor. The main difference between the two dinosaurs seems to be the shape of the crest on the top of its head, and how some of the bones that attached to this crest were formed. It was a swift hunter, but there is still debate about what it hunted based on its strange beak and head, and it most likely had feathers.

A bit more lightly built than the other Asian Oviraptors, the debate goes on as to this dinosaur's classification. In recent studies of Oviraptors, it appears that each individual would have had a different crest shape and size. North American members of this family discovered to date are considerably larger than their Asian cousins. It is possible that Rinchenia merely exhibits individual traits and is in fact an Oviraptor. As of this writing, it has not been formally described

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Sauroposeidon

Sauroposeidon proteles

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Pronounced: Saw-row-poe-Si-den

Diet: Herbivore (Plant-Eater)

Name Means: "Lizard Poseidon"

Length: 98 feet (30m)

Height: 60 feet (19 m)

Weight: 70 tons (63,500 kilos)

Time: Late Jurassic - 110 MYA

Location: Western U.S.

Sauroposeidon is possibly the tallest dinosaur ever! Reaching heights as high as a six-story building, this huge plant eater was related to Brachiosaurus. What is interesting is that it lived at a time when there were very few giant sauropods left in North America - most had become extinct by the middle of the Cretaceous period.

The discovery of this huge sauropod has been a great help to scientists, as not much is known about dinosaurs from this period. It is also a bit perplexing, however, as most of the giant North American sauropods had vanished by this time. Their cousins were thriving in South America, but for some reason they had, except for Sauroposeidon, gone extinct in North America and would not be seen again for tens of millions of years until the titanosaurs migrated north.

Very little material of this creature has been found; the genus is based on some cervical vertebrae and rib material.

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The Dinosaur of the Day is:

Giganotosaurus

Giganotosaurus carolinii

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Pronounced: Jig-an-o-toe-Saw-rus

Diet: Carnivore (Meat-Eater)

Name Means: "Giant Southern Lizard"

Length: 43 feet (14 m)

Height: 17 feet (5.5 m)

Weight: 7 tons (6,800 kilos)

Time: Late Cretaceous - 100 MYA

Location: South America

Giganotosaurus was one big meat-eater! It may have been the biggest one of all, even bigger than T. rex. It lived in South America at a time when there were still large sauropods for it to eat. It had a very strong body and a mouth full of teeth like steak knives. Just its head alone was almost 6 feet (2 m) long!

A recent discovery in Argentina suggests that Giganotosaurus may have been as large as 46 feet (15 m). What is interesting is that there is another dinosaur found in North Africa, called Carcharodontosaurus that is almost identical - in fact, it may be the same genus. Since South America and Africa were still connected back then, it is possible they are very close relations.

Like T. rex, this dinosaur hunted in warm and swampy areas. Some of the sauropods of that time had armor on their backs in order to protect them from an attack from above and that kind of attack could only have come from a predator as large as Giganotosaurus.

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Compsognathus

Compsognathus longipes

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Pronounced: Komp-so-Nath-us

Diet: Carnivore (meat-eater)

Name Means: "Elegant Jaw"

Length: 3 feet (1 m)

Height: 1 foot (.3 m)

Weight: 6 pounds (3 kilos)

Time: Jurassic

Location: Germany

Compsognathus became well known from being featured in "Lost World: Jurassic Park 2." It was one of the smallest dinosaurs we know about. This little hunter probably ate bugs and small lizards. In fact, the first fossil skeleton of this dinosaur had the remains of its last meal, a lizard, still in its stomach.

Compsognathus is one of those dinosaurs around which some controversy swirls. Some paleontologists feel that, like the much larger Tyrannosaurus, the little Compy had only two fingers. Others feel strongly that it had three. Since there are only two known fossils, and the bones are not perfectly preserved in an articulated (as they were in life) manner, it may take more discoveries to solve this issue.

Compsognathus is considered an important link in the study of bird evolution. The original fossil of this dinosaur was found in the same place as Archeopteryx, the early feathered reptile. Compy shares a number of characteristics with this creature, but Compys do not appear to have feathers. This is one of those interesting dinosaurs where scientists hope to find more specimens to learn the answers to many questions.

Edited by Raptor X7
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nice idea frogfish ;)

Edited by Conspiracy
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Saurophaganax

Saurophaganax maximus

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Pronounced: saw-Rof-a-Gan-ax

Diet: Carnivore (meat-eater)

Name Means: "Lizard-Eater Master"

Length: 50 ft.(15 meters)

Height: 17 ft.(5 meters)

Weight: 6 tons (5,400 kilos)

Time: Late Jurassic - 153 MYA

Location: N. America

Saurophaganax may be a really big Allosaurus. This dinosaur would have been a huge meat-eater, possibly reaching 50 feet (15 m) long. Very little of its fossilized bones have been found so scientists are still deciding what to call this dinosaur. Some think it is a new type of Allosaurus and some think it should have its own name. More of the fossils need to be found in order to settle the debate.

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Ouranosaurus

Ouranosaurus nigeriensis

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Pronounced: Or-an-o-Sore-us

Diet: Herbivore (Plant-Eater)

Name Means: "Valiant Lizard"

Length: 23 feet (7 m)

Height: 10 feet (3 m)

Weight: 3 tons (2,700 kilos)

Time: Early Cretaceous - 110 MYA

Location: Africa

Ouranosaurus was a cousin to the better known Iguanodon. There was one big difference between the two, however, in the way that these dinosaurs looked. Ouranosaurus had long spines along its back, some up to two feet long. These probably supported a fin that ran all the way down its tail, almost to the tip.

A nearly complete skeleton of Ouranosaurus was discovered in Niger in 1976, providing an excellent look at this unique African dinosaur. Other than its long neural spines, it had similar characteristics to other iguanodontids - thumb spikes, beak, etc.

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Yangchuanosaurus

Yangchuanosaurus shangyouensis

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Pronounced: yang-Schwan-o-Saw-rus

Diet: Carnivore (Meat-Eater)

Name Means: "Yangchuan Lizard"

Length: 35 feet (11 m)

Height: 14 feet (4.5 m)

Weight: 3.5 tons (3,150 kilos)

Time: Late Jurassic - 150 MYA

Location: Asia

This was a very large, ferocious meat-eater from China. Yangchaunosaurus lived at the end of the Jurassic Period and would have been around to hunt some of the large sauropods that lived in Asia at the same time.

There has been some discussion about whether Yangchuanosaurus belongs in the megalosaur family or that of the allosaurs, with which it was more closely associated. Opinion tends to lean towards the allosaur line. To date, there are two, and possibly three, other species assigned to this genus. It may have had a cranial crest.

Edited by frogfish
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Poekilopleuron

Poekilopleuron bucklandi

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Pronounced: poe-Key-low-Pler-on

Diet: Carnivore (Meat-Eater)

Name Means: "Various Side"

Length: 30 feet (9 m)

Height: 10 feet (3m)

Weight: 1.5 (1,300 kilos)

Time: Late Jurassic - 165 MYA

Location: Europe

Poekilopleuron was found in 1838, making it one of the first dinosaurs ever discovered in Europe. Unfortunately, no one will ever see or study the original fossils of this large, ferocious meat-eater, as they were destroyed during WWII when bombs leveled the museum in which they were stored. Some scientists think that it may be the same dinosaur as Megalosaurus, but it will be impossible to know for sure unless other fossils are uncovered that are the same as the originals.

With no specimen available for a reliable evaluation using contemporary analysis techniques, the questions and debates surrounding Poekilopleuron may never be resolved. A specimen from the former Soviet Union was initially described as a species of this dinosaur, but that classification is considered invalid by most scientists.

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Edmontosaurus

Edmontosaurus regalis

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Pronounced: ed-Mon-toe-Saw-rus

Diet: Herbivore (Plant-Eater)

Name Means: "Edmonton Lizard"

Length: 43 feet (13 m)

Height: 16 feet (5 m)

Weight: 3 tons (2,700 kilos)

Time: Cretaceous

Location: Western North America

Edmontosaurus was possibly the largest of the duck-billed hadrosaurs. It was a little bigger than a T. rex and was probably a food source for the large meat-eater. It walked on all four legs much of the time, but it could also stand easily on its hind legs, as they were much larger than its front legs. Edmontosaurus had on average over 500 teeth and some had over 1,000! These were all jammed together in what is called a dental battery. This dinosaur could really chew up the tough plants on which it fed.

Edmontosaurus was originally described as Anatosaurus; for many years the species annectens was attributed to the genus Anatosaurus. Now both Anatosaurus and Claosaurus are known as Edmontosaurus. Hadrosaurs were among the most common herbivores of the late Cretaceous. Like other hadrosaurs, it had a beak that was covered with a horny sheath. Excellent mummified specimens of these dinosaurs have been found, adding a great deal to the knowledge of dinosaur skin and musculature.

When first discovered, many researchers thought these dinosaurs would have lived in the water due to the shape of their heads and the fact that one mummified specimen seemed to have webbing on its front feet. Later research has shown, however, that these creatures lived primarily on coastal plains, floodplains and river deltas. Their dental structure also supports a more terrestrial lifestyle, as was perfectly suited for plants that were found in forests near water, and not those that were found in the water. Another interesting Edmontosaurus feature is that the skin seemed to consist, at least partly, of horny plates - good defense against glancing bites and blows from predators.

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Valdosaurus

Valdosaurus canaliculatus

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Pronounced: Val-doe-Saw-rus

Diet: Herbivore (plant-eater)

Name Means: "Wealden Lizard"

Length: 10 ft.(3 meters)

Height: 3 ft.(1 meters)

Weight: unknown

Time: Early Cretaceous - 140 MYA

Location: Europe, Africa

Valdosaurus was a small plant-eater related to Iguanodon. It is an interesting dinosaur because it has been found both in England and in the middle of Africa. This tells scientists that dinosaurs probably migrated between these two countries over great distances, most likely in large herds. Additionally, this discovery supports the theory that a land bridge connected Africa to Europe during part of the Cretaceous.

Identified incorrectly for several years, Valdosaurus was originally thought to be a Hypsilophodon and then a Dryosaurus.

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[attachmentid=25131]

Bambiraptor

Bambiraptor feinbergi

Pronounced:Bam - bee - Rap - tor

Diet:Carnivore (meat-eater)

Name Means:"Baby Raider"

Length:3 ft.(1 m)

Height:1 ft.(30 cm)

Weight:7 lb.(3 kg)

Time:Late Cretaceous - 80 MYA

Fact Card: Download a flash card to cut out and quiz your friends

Location:N. America

Bambiraptor is one of the most important fossils found in North America. This little bird-like dinosaur was a very quick hunter, and it may have been an important step in dinosaurs' evolution into birds. Scientists believe that feathers and fuzz covered its body. The fuzz would have been like the downy covering on baby birds.

Bambiraptor had quite a few features in common with modern birds. It had a wishbone, something all modern birds have that allow them to flap their wings, and its arms and hands were very long for its body size. In fact, the length of its arms and hands approached the lengths needed for flight. It also had an ossified sternum, a bone that is essential for birds to be able to move their wings for flying.

Even with these similarities, however, there is no doubt that Bambiraptor was still a dinosaur from the raptor family. It had the killer claw on its foot like Velociraptor, and it had a mouth full of sharp teeth. Bambiraptor is considered by many to be the North American version of Archaeopteryx. Clearly a short step away from its European relative, this specimen is an exceptionally important piece of the bird/dinosaur puzzle. With more than 90 percent of the animal discovered, along with the remains of what may be a second individual, this specimen will continue to provide insight into the evolution of birds.

Note: Bambiraptor is NOT named after a famous cartoon deer. Bambi is short for the Italian word "Bambino," which means baby.

post-28914-1145771678.jpg

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Huayangosaurus

Huayangosaurus taibaii

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Pronounced: wah-Yang-o-Saw-rus

Diet: Herbivore (Plant-Eater)

Name Means: "Sichuan lizard"

Length: 13 feet (4 m)

Height: 4 feet (1.3 m)

Weight: 1,000 pounds (450 kilos)

Time: Middle Jurassic - 165 MYA

Location: China

Huayangosaurus is a very important member of the same family to which Stegosaurus belongs. It is the oldest known member of the stegosaur family and it seems to demonstrate how these dinosaurs evolved the plates along their backs. Huayangosaurus was less than half the size of its later family members.

This dinosaur is considered one of the most important fossils to be discovered in China. It is one of only two stegosaurs to be found with an associated skull. Huayangosaurus exhibits many characteristics of an evolutionarily transitional species. The plates along its back become more spike-like the closer they are to the tail. This supports the theory that stegosaur plates evolved from spikes. The skull and teeth are also more primitive than later stegosaurs, as this species still had premaxillary teeth , which disappeared in later stegosaurs.

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Coelophysis

Coelophysis Bauri

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Pronounced: see-low-FI-sis

Diet: Carnivore (meat-eater)

Name Means: "Hollow Form"

Length: 10 ft (3m)

Height: 4 ft (1.3m)

Weight: 66 pounds (30 kg)

Time: Late Triassic - 220 MYA

Location: North America

Coelophysis is a well-known, very early theropod dinosaur. It was approximately the same size as a wolf yet weighed less than a hundred pounds. This is because coelophysis had very light, hollow bones, from which it derives its name. Two distinct forms have been found - "robust" and "gracile" - which scientists believe represent males and females.

The slender build and long legs of coelophysis imply that it was a swift runner. It had keen eyesight and long, grasping limbs for catching quick-moving prey. It appears to have fed mainly on insects, mammals, and small lizards.

Fossils of coelophysis have been found with the bones of juveniles and hatchlings in their abdomen. At first it was believed that these represented unborn young. However, the level of development suggests that this was not the case. Coelophysis was a cannibal and may have eaten any small animal it could catch - including its own offspring.

-Pilgrim

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Cryolophosaurus

Cryolophosaurus elliotti

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Pronounced: Cry-o-Lof-o-Saw-rus

Diet: Carnivore(Meat-eater)

Name Means: "Frozen Crested Lizard"

Length: 20 ft. (6 m)

Height: 7 ft. (2 m)

Weight: unknown

Time: Early Jurassic - 190 MYA

Location: Antarctica

Cryolophosaurus is the first meat-eating dinosaur to be discovered on the frozen continent of Antarctica. It was an odd looking dinosaur, fairly large for such an early hunter. It had a very unusual crest, sort of a single horn without a point. It is an important discovery not only because of where it was found, but also because it shows features found on both early, less advance meat-eaters and later more advanced meat-eaters such as Allosaurus. When this dinosaur was roaming around on Antarctica, that island continent was a part of Pangaea and attached to Africa, South America and Australia in a much warmer part of the world.

It is possible that Cryolophosaurus will be assigned to the ceratosaur family once further study is concluded. Little is known of this dinosaur due in part to the inhospitable environment where its remains were discovered. It is likely an important piece of the puzzle for theropod evolution, bridging both primitive and more advanced features.

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Troodon

Troodon Formosus

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Pronounced: True-don

Diet: Carnivore (meat-eater)

Name Means: "Tooth That Wounds"

Length: 6 feet (1.8m)

Height: 2 feet (.7m)

Weight: 110 pounds (50 kg)

Time: Late Cretaceous - 67 MYA

Location: North America

A comparison of brain mass to body mass shows that troodon may very well be the smartest dinosaur to ever live. It was a descendant of the raptors and shared their sickle-shaped toe claws. Like raptors, it was swift, highly intelligent, and probably social. Paleontologists believe it had feathers.

Troodon fossils were discovered as early as 1855, however, they were fragmentary and originally attributed to numerous other species. It wasn't until a nearly complete skeleton was found that the true nature of the animal became apparent. Some 20 different specimens have been found to date, including a rare egg with a fossilized embryo inside.

-Pilgrim

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Liliensternus

Liliensternus liliensterni

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Pronounced: Lil-ee-an-Stern-us

Diet: Carnivore (Meat-Eater)

Name Means: "Lilienstern's"

Length: 20 feet (6 m)

Height: 8 feet (2.5 m)

Weight: 880 pounds (400 kilos)

Time: Late Triassic - 215 MYA

Location: Central Europe

Liliensternus was a very early large meat-eater that was likely one of the first dinosaurs. It is difficult to determine what it looked like as not much of this dinosaur has been found. Liliensternus gets its name from Hugo Rule von Lilienstern, a German scientist.

Originally referred to as Halticosaurus when it was first discovered in 1934, it was later renamed in 1984 after further study. Liliensternus was a lightly built dinosaur, typical of the early carnivores. A partial specimen found in 1993 seems to fall on the Triassic/Jurassic boundary, which could make this an important transitional species. To date, all of the specimens that have been found appear to be sub-adults; so much of our knowledge is incomplete.

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[attachmentid=25228]

Megaraptor

Megaraptor namunhuaiquii

Pronounced:Meg - uh - Rap - tor

Diet:Carnivore (Meat-Eater)

Name Means:"Big Robber"

Length:26 feet (8 m)

Height:10 feet (3 m)

Weight:1 tons (900 kilos)

Time:Middle Cretaceous - 90 MYA

Fact Card: Download a flash card to cut out and quiz your friends

Location:South America, possibly Asia

If this monster was everything scientists think it was, it could have been the most vicious predator ever. Megaraptor was like a giant Velociraptor, larger even than Utahraptor, that had a killing claw over 14 inches (36 cm) long! Add to that its sharp teeth, long powerful arms and hands with huge claws and you have one fierce animal. The trouble is, very little of this dinosaur has been found, and it is a very recent discovery, so it may be some time before we know for certain what it really looked like.

Discovered in 1997 in Argentina, Megaraptor was found associated with the fossil remains of Unenlagia, a bird-like dinosaur. There is some speculation that Megaraptor was the adult version of Unenlagia, which is known from an apparently juvenile specimen. Remains of a specimen similar to those of the Megaraptor have also recently been found in China and await study.

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Ha if it lived in both South Am. and asia it "mite" have lived in north Am. It "mite" have cross that in to alska. :geek:

post-28914-1146052701.jpg

Edited by SG7
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Ha if it lived in both South Am. and asia it "mite" have lived in north Am. It "mite" have cross that in to alska. :geek:

During the Middle Cretaceous, South America was an island, and North America and Asia were on opposite sides of the earth. Thus, I strongly doubt that Megaraptor lived in both continents. Also, Megaraptor is now known to be a carnosaur (relative of Allosaurus) rather than a dromaeosaur.

-Pilgrim

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During the Middle Cretaceous, South America was an island, and North America and Asia were on opposite sides of the earth. Thus, I strongly doubt that Megaraptor lived in both continents. Also, Megaraptor is now known to be a carnosaur (relative of Allosaurus) rather than a dromaeosaur.

-Pilgrim

So its not a raptor.

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There was correlation between Oviraptor (Mongolia) and a giant Oviraptorid which lived in N. America...

Mamenchisaurus

Mamenchisaurus constructus

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Pronounced: mah-Men-key-Saw-rus

Diet: Herbivore (Plant-Eater)

Name Means: "mamenxi lizard"

Length: 82 feet (25 m)

Height: 25 feet (8 m)

Weight: 18 tons (16,000 kilos)

Time: Jurassic

Location: China, Mongolia

Mamenchisaurus is one of the most unique long-necked dinosaurs for a very good reason - it has a really long neck. In fact, it has the longest neck of any creature that ever lived. Stretching 46 feet (15 m), the neck on Mamenchisaurus was longer than a school bus! The rest of it was just like other members of its family; a long tail, stout legs and really big.

The architecture of the neck of this dinosaur is incredible. It had 19 neck vertebrae, more than any other dinosaur. The vertebrae had long struts running between them that would have limited the ability of Mamenchisaurus to turn its neck too sharply, but it could still reach well up into the trees to feed. This plant-eater had spatula-shaped teeth that seem to have been well designed to chew coarse plant material. This is one feature that makes it different from the members of the Diplodocidae family, which had peg shaped teeth, to which it has been thought to belong. It is now being thought of as possibly part of a group of sauropods unique to Asia. Most of the big Asian sauropods, such as Omeisaurus, had spatulate teeth. In fact, the Asian sauropods, including Mamenchisaurus, seem to share more characteristics with Brachiosaurus than with Diploducus. For evidence of this, one needs to look no further than the nose - Mamenchisaurus and other Asian sauropods are very close in evolutionary terms to that of Brachiosaurus. It is also thought that another aspect that these creatures had in common was that they were finding their food high off the ground. Diploducus and Apatosaurus on the other hand were likely feeding on low growing plants.

Note: Many people don't realize that China is one of the most prolific areas for the discovery of dinosaurs. The Sichuan Province is perhaps the best place in the world to find Jurassic dinosaurs.

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Whats the defints beteewn Tyrannosaurus bataar and Tyrannosaurus? They both lived in North Am. and asia. I can't tell the defints.

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So its not a raptor.

No, it is not. This is not the only dinosaur to be so confused. Baryonyx was once believed to be a dromaeosaur. It stems from largely incomplete fossils and a confusion of dromaeosaur toe claws with the hand claws from a larger theropod. It just goes to show that in the case of largely fragmented finds it can take a great deal of study to determine the identity of the creature.

Whats the defints beteewn Tyrannosaurus bataar and Tyrannosaurus? They both lived in North Am. and asia. I can't tell the defints.

By Tyranosaurus I assume you mean Tyranosaurus Rex. Tyranosaurus is the genus; Rex is the species. Thus, the difference between T. Rex and T. Bataar would be the same as the difference between a lion and a tiger, or between a black bear and a brown bear.

-Pilgrim

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