Harman Patil (Editor)

Elrhazosaurus

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Kingdom
  
Animalia

Clade
  
Dinosauria

Family
  
†Dryosauridae

Phylum
  
Chordata

Order
  
Ornithischia

Class
  
Reptilia

Suborder
  
†Ornithopoda

Species
  
†E. nigeriensis

Rank
  
Genus

Elrhazosaurus imagesdinosaurpicturesorgElrhazosaurusunknown

Similar
  
Lurdusaurus, Barilium, Eocursor, Berberosaurus, Kangnasaurus

Elrhazosaurus is a genus of basal iguanodontian dinosaur, known from isolated bones found in Lower Cretaceous rocks of Niger. These bones were initially thought to belong to a species of the related dryosaurid Valdosaurus, but have since been reclassified.

Contents

Discovery and history

Elrhazosaurus is based on MNHN GDF 332, a left thigh bone collected by Philippe Taquet from the upper part of the Elrhaz Formation of Gadoufaoua in the Ténéré Desert, Agadez, Niger. This rock unit dates to the late Aptian stage, approximately 115 million years ago. The bone was designated as the type specimen of a new species of Valdosaurus (V. nigeriensis) by Peter Galton and Taquet in 1982. It was differentiated from the type species V. canaliculatus by the locations of trochanters and other details. Because V. canaliculatus is known from Europe, the presence of a related species in central Africa was interpreted as evidence for a land connection between the two continents.

V. nigeriensis was given its own genus, Elrhazosaurus, by Galton in 2009. This was done on the grounds of differing morphology and geologic age versus V. canaliculatus. He retained it as a dryosaurid. While Elrhazosaurus is sometimes described as only known from thigh bones, at least one upper arm bone has been assigned to the genus.

Paleoecology and paleobiology

The Elrhaz Formation is mostly made up of fluvial sandstones. A diverse assemblage of fossil animals has been recovered, including freshwater bivalves, hybodont sharks, bony fish, turtles, several genera of crocodylomorphs (Anatosuchus, Araripesuchus, Sarcosuchus, and Stolokrosuchus), undescribed ornithocheirid pterosaurs, the theropod dinosaurs Eocarcharia, Kryptops, Suchomimus, and an undescribed noasaurid (possibly Bahariasaurus), the sauropods Nigersaurus and an undescribed titanosaurian (possibly Malawisaurus), and the iguanodontians Lurdusaurus and Ouranosaurus. As a dryosaurid iguanodontian, Elrhazosaurus would have been a lightly built herbivorous bipedal runner.

References

Elrhazosaurus Wikipedia


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