Deltatheridium

Deltatheridium Temporal range: Santonian-Campanian ~84.9–70.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Deltatheridium pretrituberculare
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Deltatheroida
Family:	†Deltatheridiidae
Genus:	†Deltatheridium Gregory & Simpson, 1926
Species
D. pretrituberculare (type) D. nessovi

Deltatheridium (meaning triangle beast or delta beast) is an extinct species of metatherian. It lived in what is now Mongolia during the Upper Cretaceous, circa 80 million years ago.^[1] A study in 2022 strongly suggested that Deltatherium was a marsupial, making it the earliest known member of this group.^[2]

It had a length of about 15 cm (5.9 in). Its teeth indicate it was carnivorous. One specimen of Archaeornithoides might attest an attack by this mammal, the skull bearing tooth marks that match its teeth.^[3]

Other Mesozoic mammals from Mongolia

• Kamptobaatar
• Zalambdalestes

References

Further reading

• Parker, Steve. Dinosaurus: the complete guide to dinosaurs. Firefly Books Inc, 2003. Pg. 403
• Rougier, G. W.; Wible, J. R.; Novacek, M. J. (1998). "Implications of Deltatheridium specimens for early marsupial history". Nature. 396 (6710): 459–63. Bibcode:1998Natur.396..459R. doi:10.1038/24856. PMID 9853752. S2CID 204996216.

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Metatheria

Kingdom: Animalia Phylum: Chordata Class: Mammalia Subclass: Theria
Synapsida see Synapsida Cynodontia see Cynodontia Mammalia see Mammalia Metatheria see below↓

Metatheria
Metatheria †Adinodon †Archaeonothos †Esteslestes †Ghamidtherium †Holoclemensia? †Kasserinotherium †Protalphadon †Sinodelphys? †Deltatheroida Pappotherium? Deltatheridiidae Atokatheridium? Deltatheridium Deltatheroides Gurbanodelta Lotheridium Nanocuris Oklatheridium? Prodeltitheridium Sulestes Tsagandelta Marsupialiformes †Adelodelphys †Aenigmadelphys †Anchistodelphys †Andinodelphys †Arcantiodelphys †Camptomus? †Glasbius †Gurlin Tsav skull †Iugomortiferum †Jaskhadelphys †Mayulestes †Pucadelphys †Sinbadelphys †Sparassodonta see below↓ †Asiatheriidae Asiatherium Kokopellia †Archimetatheria Iqualadelphis Stagodontidae Didelphodon Eobrasilia? Eodelphis Fumodelphodon Hoodootherium Pariadens? Pediomyoidea Aquiladelphis Austropediomys Dakotadens Monodelphopsis Pediomys Protolambda Scalaridelphys Unnuakomys †Peradectidae Armintodelphys Didelphidectes Mimoperadectes Nanodelphys Peradectes Siamoperadectes †Alphadontidae Albertatherium Alphadon Eoalphadon Turgidodon †Herpetotheriidae Amphiperatherium Asiadidelphis Copedelphys Ectocentrocristus Entomacodon Galatiadelphys Golerdelphys Herpetotherium Indodelphis Maastrichtidelphys Morotodon? Nortedelphys Peratherium Rumiodon? Swaindelphys Thylacodon †Anatoliadelphyidae Anatoliadelphys Orhaniyeia †Polydolopimorphia see below↓ Marsupialia Ameridelphia Didelphimorphia Paucituberculata Australidelphia

Sparassodonta
Sparassodonta Allqokirus Argyrolestes Hondadelphys Nemolestes Patene Procladosictis Stylocynus Hathliacynidae Acyon Australogale Borhyaenidium Chasicostylus Cladosictis Notictis Notocynus Notogale Perathereutes Pseudonotictis Sallacyon Sipalocyon Borhyaenoidea Angelocabrerus Chlorocyon Dukecynus Fredszalaya Lycopsis Pharsophorus Plesiofelis Prothylacinus Pseudolycopsis Pseudothylacynus Borhyaenidae Acrocyon Arctodictis Australohyaena Borhyaena Eutemnodus? Proborhyaenidae Arminiheringia Callistoe Paraborhyaena Proborhyaena Thylacosmilidae Anachlysictis Eomakhaira Patagosmilus Thylacosmilus

Polydolopimorphia

Polydolopimorphia Apeirodon? Bobbschaefferia Caroloameghinia Carolocoutoia Guggenheimia Gashternia Hatcheritherium Palangania Procaroloameghinia Protodidelphis Pujatodon? Reigia Robertbutleria Wamradolops Zeusdelphys Bonapartheriiformes Bonapartheriidae Bonapartherium Epidolops Argyrolagidae Anargyrolagus Argyrolagus Hondalagus Microtragulus Proargyrolagus Chulpasiinae Chulpasia Thylacotinga Prepidolopidae Incadolops Perrodelphys Prepidolops Punadolops Seumandia Rosendolopidae Hondonadia Rosendolops Polydolopiformes Polydolopidae Amphidolops Antarctodolops Eudolops Eurydolops Hypodolops Kramadolops Parabderites Polydolops Pseudolops Sillustaniidae Roberthoffstetteria Sillustania

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