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Dicraeosaurus

Dicraeosaurus (Gr. δικραιος, dikraios "bifurcated, double-headed" + Gr. σαυρος, sauros "lizard") is a genus of small diplodocoid sauropod dinosaur. It was named for the spines on the back of the neck. The first fossil was described by paleontologist Werner Janensch in 1914.

DescriptionEdit

File:Dicraeosaurus hansemanni22.jpg

Unlike most diplodocoids, Dicraeosaurus had a large head with a relatively short and wide neck. The neck contained 12 unusually short vertebrae, so it could probably browse vegetation only from ground level to a height of about Template:Convert.[1] It also lacked the whiplash tail that other diplodocids had. It was smaller, at only reached Template:Convert in length. It gets its name, which means two-forked lizard, from the spines that came from the vertebrae. They were not straight as in some members of the family. Each one was “Y” shaped, like a fork. These spines also provided muscle attachment points.[2]

PalaeoecologyEdit

Dicraeosaurus lived in the Late Jurassic. It was herbivorous; however, it didn’t compete with other dinosaurs for vegetation. Fossils have been discovered in the rocks of Tendaguru Hill in Tanzania. The rocks also yield fossils of Giraffatitan and Kentrosaurus. As there was a distinct difference in size between these animals, they would probably have browsed for vegetation at different levels, allowing them to co-exist without significant competition.[2]

ClassificationEdit

File:Dicraeosaurids BW.png
File:Dicreosaurus headDB.jpg

The following cladogram follows an analysis by Sereno et al. in 2007.[3]

Diplodocoidea

Diplodocidae

Apatosaurus



Diplodocus




Suuwassea


Dicraeosauridae

Amargasaurus




Brachytrachelopan



Dicraeosaurus





Rebbachisauridae

Histriasaurus




Rebbachisaurus






Cathartesaura



Limaysaurus




Zapalasaurus





Demandasaurus



Nigersaurus







ReferencesEdit

  1. Template:Cite book
  2. 2.0 2.1 Template:Cite book
  3. Sereno PC, Wilson JA, Witmer LM, Whitlock JA, Maga A, et al. (2007) Structural Extremes in a Cretaceous Dinosaur. PLoS ONE 2(11): e1230.

External linksEdit

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