HOME
The Info List - Daqingshanodon





Daqingshanodon is an extinct genus of dicynodont therapsid from the Late Permian of Inner Mongolia, China. The type species D. limbus was described in 1989 from a single skull found in the Naobaogou Formation.[1] Daqingshanodon belongs to a group of dicynodonts called cryptodonts. It is the smallest known cryptodont, and the only one known from China. Like other cryptodonts, it has a pair of rounded nasal bosses above its nostrils and a ridge of bone on the upper jaw called the postcaniniform process. Daqingshanodon has a pair of elongated, recurved tusks extending from its beak-like snout. It is distinguished from other dicynodonts by the presence of a distinct ridge running along the side of the skull from below the eye socket to the area around the tusks. The skull of Daqingshanodon is less than 10 centimetres (3.9 in) long, yet this specimen is thought to have been an adult on the basis of its well-developed nasal bosses.[2] In his 1998 study of dicynodont biogeography, paleontologist Spencer G. Lucas synonymized Daqingshanodon with Dicynodon, forming the species Dicynodon limbus.[3] Most of the features used to distinguish Daqingshanodon as a distinct genus were also seen in specimens of Dicynodon. In 2011, a study of Dicynodon species included D. limbus in its phylogenetic analysis. D. limbus was placed among the cryptodonts, which are only distantly related to Dicynodon. With this phylogenetic placement, the genus Daqingshanodon was reinstated for D. limbus. Below is a cladogram from the 2011 analysis:[2]

Bidentalia 

 Cryptodontia 

Keyseria

Daqingshanodon

 Oudenodontidae 

Oudenodon

Tropidostoma

Australobarbarus

Odontocyclops

Idelesaurus

 Rhachiocephalidae 

Rhachiocephalus

Kitchinganomodon

 Geikiidae 

Aulacocephalodon

Pelanomodon

Geikia

 Dicynodontoidea 

Interpresosaurus

Elph

Katumbia

Gordonia

Delectosaurus

Vivaxosaurus

Dicynodon

Daptocephalus

Dinanomodon

Peramodon

Lystrosauridae

Turfanodon

Kannemeyeriiformes

References[edit]

^ Zhuh, Y. (1989). "The discovery of dicynodonts in Daqingshan Mountain, Nei Mongol (Inner Mongolia)" (PDF). Vertebrata PalAsiatica. 27 (1): 9–27.  ^ a b Kammerer, C.F.; Angielczyk, K.D.; Fröbisch, J. (2011). "A comprehensive taxonomic revision of Dicynodon (Therapsida, Anomodontia) and its implications for dicynodont phylogeny, biogeography, and biostratigraphy". Journal of Vertebrate Paleontology. 31 (Suppl. 1): 1–158. doi:10.1080/02724634.2011.627074.  ^ Lucas, S.G. (2001). "Permian". Chinese Fossil Vertebrates. New York: Columbia University Press. pp. 71–88. ISBN 978-0-231-08483-3. 

v t e

Anomodonts

Kingdom: Animalia Phylum: Chordata Class: Synapsida Order: Therapsida (unranked): Neotherapsida

Major clades

Chainosauria Dicynodontia Therochelonia Bidentalia Pristerodontia Dicynodontoidea

Early anomodonts

Basal anomodonts

Biseridens Patranomodon

Anomocephaloidea

Anomocephalus Tiarajudens

Venyukovioidea

Otsheridae

Otsheria Suminia

Venyukoviidae

Ulemica Venyukovia

Chainosauria

Galechirus Galeops Galepus Dicynodontia

Dicynodontia

Basal dicynodonts

Colobodectes Eodicynodon

Endothiodontia / Endothiodontidae

Chelydontops Endothiodon Lanthanostegus Pachytegos

Eumantellidae

 ?Emyduranus  ?Eurychororhinus Pristerodon  ?Storthyggnathus  ?Synostocephalus

Therochelonia

Diictodontia

Pylaecephalidae

Diictodon Eosimops  ?Koupia Prosictodon Robertia

Emydopoidea

Brachyprosopus Compsodon Cryptocynodon

Emydopidae

Emydops

Kistecephalia

Cistecephalidae

Cistecephaloides Cistecephalus Kawingasaurus

Kingoriidae

Dicynodontoides Kombuisia Niassodon

Myosauridae

Myosaurus

Bidentalia

Cryptodontia

Daqingshanodon Idelesaurus Keyseria Odontocyclops

Oudenodontidae

Australobarbarus Oudenodon Tropidostoma

Rhachiocephalidae

Kitchinganomodon Rhachiocephalus

Geikiidae

Bulbasaurus Syops

Geikiinae

Aulacephalodon Geikia Pelanomodon

Dicynodontoidea Pristerodontia

Dicynodontoidea

Lystrosauridae

Basilodon Euptychognathus Jimusaria Kwazulusaurus Lystrosaurus Sintocephalus

Other dicynodontoids

Daptocephalus Delectosaurus Dicynodon Dinanomodon Elph Gordonia Interpresosaurus Katumbia Peramodon  ?Propelanomodon Turfanodon Vivaxosaurus Kannemeyeriiformes

Kannemeyeriiformes

Dinodontosauridae

Dinodontosaurus

Kannemeyeriidae

Kannemeyeria

Shansiodontidae

Shansiodon Tetragonias Vinceria Rhinodicynodon

Stahleckeriidae

Sungeodon

Placeriinae

Moghreberia Placerias Zambiasaurus

Stahleckeriinae

Eubrachiosaurus Ischigualastia Jachaleria Sangusaurus Stahleckeria

Other kannemeyeriforms

Angonisaurus Dolichuranus Parakannemeyeria Rabidosaurus Rechnisaurus Rhadiodromus Sinokannemeyeria Uralokannemeyeria Wadiasaurus Xiyukannemeyeria

Related categories

Anomodonts Dicynodonts

Taxon identifiers

Wd: Q5221837 EoL: 42328994 G

.