allosauridae

ALLOSAURUS
“Other lizard”
Late Jurassic, 155-150 million years ago

Allosaurus was probably the most common – and successful – carnosaur of the late Jurassic. It was a large but speedy predator, running up to 20 mph. It had sharp, powerful teeth and two ornate ridges along its skull, one above each eye. It was first discovered in the late 19th century, and enjoyed several decades of well-deserved fame before the garish Tyrannosaurus rex eclipsed it in popularity. Experts agree that this elegant hunter was too noble to hold a grudge, and doesn’t need your pity.

Epanterias amplexus

Source: http://demonpuppy.blogspot.com/2008_04_01_archive.html

NameEpanterias amplexus 

Name Meaning: Buttressed vertebrae

First Described: 1878

Described By: Cope 

ClassificationDinosauria, Saurischia, Eusaurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Carnosauria, Allosauroidea, Allosauria, Allosauridae 

Epanterias is a dubious allosaurid genus given that it was discovered quite a long time ago and the material has been reclassified again and again. It was from the Kimmeridgian-Tithonian age of the Late Jurassic in the Morrison Formation of Colorado, dating about 146.8 million years ago. Cope originally thought it was a sauropod, however later it was described as a large species of Allosaurus, but it has been called both a large individual of A. fragilis as well as its own genus, E. amplexus. Regardless, it was 11 meters long and weighed 3 to 5 tons, as big as Tyrannosaurus. Until more material is found, we don’t know much about this animal. 

Sources: 

http://www.smithsonianmag.com/science-nature/a-truly-exceptional-allosaurus-30879252/

http://en.wikipedia.org/wiki/Epanterias

http://www.enchantedlearning.com/subjects/dinosaurs/glossary/indexe.shtml

Shout out goes to chavinho11!

Saurophaganax maximus

Source: http://www.redorbit.com/education/reference_library/none/2583840/saurophaganax/

NameSaurophaganax maximus 

Name Meaning: Largest Lizard-Eating Master 

First Described: 1995

Described By: Chure 

ClassificationDinosauria, Saurischia, Theropoda, Neotheropoda, Averostra, Tetanurae, Orionides, Avetheropoda, Carnosauria, Allosauridae

Saurophaganax was a large allosaurid from the Morrison Formation of Oklahoma, from the Kimmeridgian stage of the the Late Jurassic, 151 million years ago. This makes it a contemporary of Allosaurus, and it is considered widely in the paleontological community to be a species of Allosaurus. It was a huge theropod, about 13 meters long. New material of the species from New Mexico has been uncovered, which might allow for its taxonomic relationship with Allosaurus to be cleared up. It was one of the largest carnivores of the area, bigger than both Allosaurus and Torvosaurus, making it a formidable foe and a potential apex predator. It was so large that if it had lived in the Cretaceous it would have rivaled both Tyrannosaurus and Giganotosaurus. However, this means it was much more rare than Allosaurus, given its need for more prey, as evidenced by the small amount of fossil material for it. It might have also been slower due to its size, forced to scavange rather than hunt, which is plausible given the prevalence of Allosaurus in the area. However the most likely idea is that it both hunted and scavanged, opportunistic in its need to gather as much food as possible. Given the numerous large herbivorous dinosaurs at the time - especially sauropods - this probably wouldn’t have been much of a problem.

Sources:

http://www.prehistoric-wildlife.com/species/s/saurophaganax.html

http://en.wikipedia.org/wiki/Saurophaganax

Shout out goes to rknickme