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Desmatosuchus

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Desmatosuchus
Fossil range: Late Triassic
Desmatosuchus BW
Desmatosuchus haplocerus from the Late Triassic of Texas.
Scientific classification

Class:

Sauropsida

Order:

Aetosauria

Family:

Stagonolepididae

Genus:

Desmatosuchus
Case, 1920

Species:

  • D. haplocerus
  • D. spurensis (type)
  • D. smalli [1]

Desmatosuchus (meaning "link crocodile") is an extinct genus of archosaur belonging to the Order Aetosauria. It was one of the largest aetosaurs, being 5 metres (16 ft) long[2] and about 1.50 m (5 ft) high. It lived during the Late Triassic in Texas.

DescriptionEdit

Desmatosuchus looked like its relatives, possessing an armored body and pig-like head. It had a shovel-like snout and weak teeth that suggest it lived by uprooting soft plants. Like many of its relatives, it had heavy armoured plates along its back, tail, and parts of the underside. However, unlike most other aetosaurs, Desmatosuchus also had two rows of spikes along the sides of its back. The largest spikes, above the shoulders, were 45 centimetres (18 in) long. These probably gave it extra protection against predators.[2]

Two species are currently accepted: D. spurensis and D. smalli [3]. Desmatosuchus chamaensis is recognized as a distinct genus [4], but there is some dispute about whether the name Heliocanthus or Rioarribasuchus applies [5].

Classification and speciesEdit

A revision of Desmatosuchus by Parker (2008) found the lectotype of Episcoposaurus haplocerus to be referable to Desmatosuchus but indeterminate at the species level. Therefore, E. haplocerus was considered to be a nomen dubium and D. spurensis was reinstated as the type species of the genus. Two species were accepted as valid: D. spurensis and D. smalli.[3] Desmatosuchus chamaensis is recognized as a distinct genus,[4] but there is some dispute about whether the name Heliocanthus or Rioarribasuchus applies.[5]

The following cladogram simplified after an analysis presented by Julia B. Desojo, Martin D. Ezcurra and Edio E. Kischlat (2012).

 Aetosauria 

Aetosauroides scagliai


 Stagonolepididae 

Aetosaurus ferratus



Coahomasuchus kahleorum




Neoaetosauroides engaeus




Calyptosuchus wellesi



Stagonolepis robertsoni




Aetobarbakinoides brasiliensis



 Typothoracisinae 


Typothorax



Redondasuchus



 Paratypothoracisini 

Tecovasuchus chatterjeei




Rioarribasuchus chamaensis



Paratypothorax andressorum





 Desmatosuchinae 

Sierritasuchus macalpini




Longosuchus meadei




Lucasuchus hunti




Acaenasuchus geoffreyi


 Desmatosuchus 

Desmatosuchus haplocerus



Desmatosuchus smalli













PaleobiologyEdit

ReferencesEdit

  1. ^ Parker, W.G. (2005). A new species of the Late Triassic aetosaur Desmatosuchus (Archosauria:Pseudosuchia). Compte Rendus Palevol 4(4): 327-340.
  2. ^ a b Palmer, D., ed (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 96. ISBN 1-84028-152-9. 
  3. ^ Parker, W.G. (2008). Description of new material of the aetosaur Desmatosuchus spurensis (Archosauria: Suchia) from the Chinle Formation of Arizona and a revision of the genus Desmatosuchus. PaleoBios 28(1): 1-40.
  4. ^ Parker, W.G. (2007). Reassessment of the aetosaur “Desmatosuchus” chamaensis with a reanalysis of the phylogeny of the Aetosauria (Archosauria: Pseudosuchia). Journal of Systematic Palaeontology 5(1): 41-68.
  5. ^ http://scienceblogs.com/tetrapodzoology/2007/04/post_2.php.


Postosuchus BW

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