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Glirodon - Wikipedia

From Wikipedia, the free encyclopedia

Glirodon Temporal range: Late Jurassic
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Multituberculata
Suborder:	†Plagiaulacida
Family:	†incertae sedis
Genus:	†Glirodon Engelmann and Callison, 1999
Species
G. grandis

Glirodon is a genus of extinct mammal from the Upper Jurassic. It was a relatively early member of the also-extinct order of Multituberculata, suborder "Plagiaulacida". These mammals lived in North America during the Mesozoic, also known as the "age of the dinosaurs".

The genus Glirodon has been described by Engelmann G.F. and Callison G. (1999) from a 'gliriform tooth'.

The species Glirodon grandis, also described by Engelmann and Callison, has been found in the Upper Jurassic formations of Dinosaur National Monument in Utah (United States). Other than being a large, early American Multituberculate, (see Multituberculata), the nature of this beast is somewhat unclear. It is an "allodontid (two families and the genus Glirodon)", (Kielan-Jaworowska and Hurum, 2001). It had gliriform incisors; incisors with the "enamel reduced to a stripe on the front side." Apparently, this condition evolved several times among Multituberculates.

It is based on a portion of snout. "Glirodon retains the plesiomorphic 'plagiaulacidan' ("Plagiaulacida") dental formula and shares with Allodontidae the structure of the upper premolars (Pl.1 fis 2-4). It differs from the Paulchoffatiidae and Plagiaulacidae in having a single-cusped I3," (Kielan-Jaworowska & Hurum, 2001, p. 401-402). I3 refers to an upper incisor and 'plesiomorphic' means 'basal'.

Present in stratigraphic zones 4 and 6.^[1]

References

Engelmann & Callison, (1999), Glirodon grandis, a new multituberculate mammal from the Upper Jurassic Morrison Formation. Vertebrate Paleontology of Utah, pp. 161–178, in the Utah Geological Survey, (ed. Gillette DD), 8/99.
Kielan-Jaworowska Z & Hurum JH (2001), Phylogeny and Systematics of multituberculate mammals. Paleontology 44, p. 389–429.
Most of this information has been derived from [1] MESOZOIC MAMMALS; Basal Multituberculata, an Internet directory.

^ Foster, J. (2007). "Appendix." Jurassic West: The Dinosaurs of the Morrison Formation and Their World. Indiana University Press. pp. 327–329.

Allotheria

Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Clade: Theriiformes

Synapsida

- see Synapsida

Cynodontia

- see Cynodontia

Mammalia

see Mammalia
Allotheria	see below↓

Allotheria

Haramiyida?

Gondwanatheria?

Adalatherium Groeberiidae?
Ferugliotheriidae?	Argentodites? Ferugliotherium LACM 149371? Magallanodon Trapalcotherium
Sudamericidae	Bharattherium Galulatherium Gondwanatherium Greniodon? Lavanify Patagonia? Sudamerica Vintana

Multituberculata

Allodontoidea

Arginbaatar Glirodon Zofiabaatar
Allodontidae	Ctenacodon Passumys Psalodon

Paulchoffatioidea

Pinheirodontidae	Bernardodon Bructerodon Cantalera Ecprepaulax Gerhardodon Iberodon Lavocatia Pinheirodon
Paulchoffatiidae	Bathmochoffatia Galveodon Guimarotodon Henkelodon Kielanodon Kuehneodon Meketibolodon Meketichoffatia Paulchoffatia Plesiochoffatia Pseudobolodon Renatodon Rugosodon Sunnyodon Xenachoffatia

Plagiaulacoidea

Plagiaulacidae	Bolodon Morrisonodon Plagiaulax
Eobaataridae	Cheruscodon Dolichoprion Eobaatar Hakusanobaatar Heishanobaatar Iberica Indobaatar Liaobaatar Loxaulax Monobaatar? Nokerbaatar Parendotherium Sinobaatar Tedoribaatar Teutonodon
Albionbaataridae	Albionbaatar Kielanobaatar Proalbionbaatar

Cimolodonta

- see below↓

Cimolodonta

Paracimexomys group

Filikomys Neoliotomus
Cimolodontidae	Anconodon Cimolodon Liotomus
Neoplagiaulacidae	Cernaysia Ectypodus Krauseia Mesodma Mesodmops Mimetodon Neoplagiaulax Nidimys Parectypodus Paressonodon Xanclomys Xyronomys
Ptilodontidae	Aenigmamys Baiotomeus Kimbetohia Prochetodon Ptilodus

Taeniolabidoidea

Bubodens? Catopsalis Erythrobaatar Valenopsalis Yubaatar
Lambdopsalidae	Lambdopsalis Prionessus Sphenopsalis
Taeniolabididae	Kimbetopsalis Taeniolabis

Djadochtatherioidea

Bulganbaatar Chulsanbaatar Nemegtbaatar
Sloanbaataridae	Kamptobaatar Nessovbaatar Sloanbaatar
Djadochtatheriidae	Catopsbaatar Djadochtatherium Kryptobaatar Mangasbaatar Tombaatar

See also: Plagiaulacida
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