Allosaurus

Allosaurus; Temporal range: Late Jurassic, 155–145 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	Mounted A. fragilis skeleton, on Exhibit on the University of Michigan
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Reptilia
Superorder:	Dinosauria
Order:	Saurischia
Suborder:	Theropoda
Family:	Allosauridae
Genus:	Allosaurus
Binomial name
	*A.fragilis A.tendagurensis; A.europaeus; ;
Synonyms
	Antrodemus; Creosaurus; Labrosaurus;

Alosaurus is a genus of theropod dinosaurs. It lived from Kimmeridgian to Tithonian. Its remains were found mostly in Morrison Formation, that stretches from Utah to southern Canada. Its famous remains include "Big Al" an "Big Al 2"^[1]. The last one was up to 7.6 metres long^[1]. But both "Big Al 1" and "2" were found in Morrison Wyoming^[1].

Distribution

First Allosaurus fossils were found in North America, in Utah, Colorado, Wyoming. Howewer, since 1910-s its remains were unearthed in Tendaguru, in Tanzania, and even in Portugal^[2]^[3]. In these locations, allosaurus broke up into different species, tro adapt to relatively different enviroments.

Cleveland-LLoyd Dinosaur Quarry

In Cleveland Lloyd Dinosaur Quarry^[4], from Utah, scientists found one of the richest bone beds ever. One discredited hypotheses says 150 million years ago it was a watering hole. Multiple species came to drink there, and they got stuck. It was a time of extreme drought. The amount of water in the lake shrank very rapidly. The upper layer of mud was left dry, but the lower layer was left wet and sticky. When animals walked, they crushed the upper layer with their weight, and got absolutely stuck. There were found more than 44 skeletons of Allosaurus.

Teeth

Teeth of Allosaurus were pretty large up to 10 cm (4 inches) long. They were serrated on both edges, like a steak knife. These teeth almost always show wear patterns. This means that allosaurus didn't only slice through, but also crushed bone.

Tooth lenght in the left part of the upper jaw

Tooth number
Tooth lenght
Notes

1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
5	3	7	7.5	2.5	5.5	7	3	10	10	10	9	2.5		2.8	3	2	2	2
-	-	-	-	-	-	-	-	It and 3 next are the longest	-	-	-	-	-	-	-	-	-	-

Footnotes

^ ^a ^b ^c [Big Al Two Allosaurus sp.]. {{cite book}}: External link in |title= (help)
^ OCTÁVIO MATEUS, AART WALEN, AND MIGUEL TELLES ANTUNES. THE LARGE THEROPOD FAUNA OF THE LOURINHÃ FORMATION (PORTUGAL) AND ITS SIMILARITY TO THE MORRISON FORMATION, WITH A DESCRIPTION OF A NEW SPECIES OF ALLOSAURUS. {{cite book}}: line feed character in |title= at position 144 (help)CS1 maint: multiple names: authors list (link)
^ Malafaia, E., Ortega, F., Escaso, F., Dantas, P., Gasulla, J. M., Barriga, F. & Sanz, J. L. AN OVERVIEW OF THE ALLOSAURUS FOSSIL-SITE OF ANDRÉS (UPPER JURASSIC), POMBAL, PORTUGAL.{{cite book}}: CS1 maint: multiple names: authors list (link)
^ James H. Madsen. Allosaurus fragilis: a revised osteology.

[bal2-1] [Big Al Two Allosaurus sp.]. {{cite book}}: External link in |title= (help)

[all3-2] OCTÁVIO MATEUS, AART WALEN, AND MIGUEL TELLES ANTUNES. THE LARGE THEROPOD FAUNA OF THE LOURINHÃ FORMATION (PORTUGAL) AND ITS SIMILARITY TO THE MORRISON FORMATION, WITH A DESCRIPTION OF A NEW SPECIES OF ALLOSAURUS. {{cite book}}: line feed character in |title= at position 144 (help)CS1 maint: multiple names: authors list (link)

[dial4-3] Malafaia, E., Ortega, F., Escaso, F., Dantas, P., Gasulla, J. M., Barriga, F. & Sanz, J. L. AN OVERVIEW OF THE ALLOSAURUS FOSSIL-SITE OF ANDRÉS (UPPER JURASSIC), POMBAL, PORTUGAL.{{cite book}}: CS1 maint: multiple names: authors list (link)

[klyv45-4] James H. Madsen. Allosaurus fragilis: a revised osteology.

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