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Stirtodon Temporal range: Late Cretaceous (Cenomanian), 100.2–96.6 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	Monotremata
Family:	†Teinolophidae (?)
Genus:	†Stirtodon
Species:	†S. elizabethae
Binomial name
†Stirtodon elizabethae Flannery et al., 2020

Stirtodon is an extinct genus of monotreme mammal from the Late Cretaceous (Cenomanian) Griman Creek Formation of Australia. The genus contains a single species, S. elizabethae, known from a large isolated premolar. Stirtodon may be the largest toothed monotreme discovered.^[1]^[2] Several other monotremes are known from the Griman Creek Formation, including Dharragarra, Kollikodon, Opalios, Parvopalus, and Steropodon.^[3]

References

^ Rich, Thomas H.; Flannery, Timothy F.; Vickers-Rich, Patricia (2020). "Evidence for a Remarkably Large Toothed-Monotreme from the Early Cretaceous of Lightning Ridge, NSW, Australia". In Prasad, Guntupalli V.R.; Patnaik, Rajeev (eds.). Biological Consequences of Plate Tectonics: New Perspectives on Post-Gondwana Break-up–A Tribute to Ashok Sahni. Springer Nature. pp. 77–81. doi:10.1007/978-3-030-49753-8_4. ISBN 978-3-030-49753-8.
^ Flannery, Timothy F.; Rich, Thomas H.; Vickers-Rich, Patricia; Ziegler, Tim; Veatch, E. Grace; Helgen, Kristofer M. (2022-01-02). "A review of monotreme (Monotremata) evolution". Alcheringa: An Australasian Journal of Palaeontology. 46 (1): 3–20. doi:10.1080/03115518.2022.2025900. ISSN 0311-5518.
^ Flannery, Timothy F.; McCurry, Matthew R.; Rich, Thomas H.; Vickers-Rich, Patricia; Smith, Elizabeth T.; Helgen, Kristofer M. (2024-05-26). "A diverse assemblage of monotremes (Monotremata) from the Cenomanian Lightning Ridge fauna of New South Wales, Australia". Alcheringa: An Australasian Journal of Palaeontology: 1–19. doi:10.1080/03115518.2024.2348753. ISSN 0311-5518.

Mammalia

Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Cynodontia
Clade: Mammaliaformes

Synapsida

- see Synapsida

Cynodontia

see Cynodontia
Mammalia	see below↓

Mammalia

Australosphenida?

†Ambondro †Tendagurutherium? Monotremata?
†Henosferidae	Asfaltomylos Henosferus
†Ausktribosphenidae	Ausktribosphenos Bishops? Kryoparvus?

Monotremata

†Kollikodontidae?

†Steropodontidae

Parvopalus?
Steropodon

†Teinolophidae

Stirtodon?
Teinolophos

Ornithorhynchoidea

†Opalios
Ornithorhynchidae	†Dharragarra? †Monotrematum? †Obdurodon Ornithorhynchus †Patagorhynchus?
Tachyglossidae	†Megalibgwilia †Murrayglossus Tachyglossus Zaglossus

†Allotheria?

- see Allotheria
- includes multituberculates

Theriimorpha

- see below↓

Theriimorpha

†Gobiconodontidae

†Jeholodentidae

Jeholodens
Yanoconodon

†Klameliidae?

Ferganodon
Klamelia

Monotremata?
†Zhangheotheriidae	Anebodon Kiyatherium Maotherium Ningchengodon Origolestes Zhangheotherium
†Spalacotheriidae	Akidolestes Aliaga Cifellitherium Heishanlestes Infernolestes Lactodens Shalbaatar Spalacolestes Spalacotheridium Spalacotherium Spalacotheroides Symmetrodontoides Symmetrolestes Yaverlestes
Cladotheria	see below↓

Cladotheria

†Dryolestida

Brancatherulum? Dorsetodon Drescheratherium Euthlastus Henkelotherium Paurodon Tathiodon
Dryolestidae	Achyrodon Amblotherium Anthracolestes Beckumia Crusafontia Dryolestes Groebertherium? Guimarotodus Hercynodon Krebsotherium Lakotalestes? Laolestes Minutolestes Phascolestes Portopinheirodon Treslagosodon

†Meridiolestida

Amarillodon Austrotriconodon Bondesius Casamiquelia Cronopio Groebertherium? Lakotalestes? Leonardus Necrolestes Paraungulatum Quirogatherium Solanutherium
Mesungulatoidea	Coloniatherium Mesungulatum Orretherium Peligrotherium Reigitherium

†Donodontidae

Prototribosphenida

†Abelodon
†Amphibetulimus
†Amphitherium
†Arguimus
†Brancatherulum?
†Chunnelodon
†Magnimus
†Minimus
†Mozomus
†Nanolestes
†Palaeoxonodon
†Vincelestes
Monotremata?

†Peramuridae

Tribosphenida /
Boreosphenida

Theria

†Patagomaia
Eutheria	see Eutheria includes placentals
Metatheria	see Metatheria includes marsupials

Other taxa

Incertae sedis	†Atlasodon †Chronoperates †Microderson †Thereuodon †Tingamarra Saint Bathans Mammal UA 8699
Other taxa	Prototheria Yinotheria Eutriconodonta Amphilestidae Theriiformes Pantotheria Symmetrodonta Eupantotheria Paurodontidae Amphitheriidae Marsupionta

Categories:

Hidden categories:

Taxon identifiers
Stirtodon	Wikidata: Q104521351 GBIF: 11823650 Paleobiology Database: 453231
Stirtodon elizabethae	Wikidata: Q126125973 Paleobiology Database: 453232