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Argentoconodon Temporal range: Middle Toarcian ~179.17–178.07 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Order:	†Eutriconodonta
Clade:	†Volaticotherini
Genus:	†Argentoconodon Rougier et al. 2007
Species:	†A. fariasorum
Binomial name
†Argentoconodon fariasorum Rougier et al. 2007

Argentoconodon (meaning "Argentina cone tooth") is an extinct genus of theriimorph mammal from the Cañadón Asfalto Formation of the Cañadón Asfalto Basin in Patagonia. When originally described, it was known only from a single molariform tooth, which possessed a combination of primitive and derived features. The tooth is currently held in the Museo Paleontológico Egidio Feruglio, where it was given the specimen number MPEF-PV 1877. New material described in 2011 show that Argentoconodon was similar to Ichthyoconodon, Jugulator and Volaticotherium within the family Triconodontidae, and possibly also Triconolestes.

Aerial locomotion

Several postcranial similarities to Volaticotherium suggest that Argentoconodon was capable of gliding. In particular, its femur shares the same shape and proportions as its more complete relative, being highly specialised and without a femoral head, being less competent in rotational movement but more useful in extending the leg and resisting flight stresses.

Argentoconodon's spatio-temporal distribution has been noted as being unusual, in that it is not only a rare Early Jurassic eutriconodont, but also one of the only two South American members of this group, the other being the slightly younger Condorodon; other mammals in the Cañadon Asfalto Formation are various australosphenidans and a putative allothere. This has been considered worthy of interest in the future.

Diet

Like most eutriconodonts Argentoconodon was most likely animalivorous, its molars adapted to shear. In a study detailing Mesozoic mammal diets it ranks among carnivorous species. This is further corroborated by another study on Mesozoic mammal mandibles, where in plots among carnivorous rather than insectivorous taxa.

References

1. Fantasia, A.; Föllmi, K. B.; Adatte, T.; Spangenberg, J. E.; Schoene, B.; Barker, R. T.; Scasso, R. A. (2021). "Late Toarcian continental palaeoenvironmental conditions: An example from the Canadon Asfalto Formation in southern Argentina". Gondwana Research. 89 (1): 47–65. Bibcode:2021GondR..89...47F. doi:10.1016/j.gr.2020.10.001. S2CID 225120452. Retrieved 27 August 2021.
2. Rougier, Guillermo W.; Garrido, Alberto; Gaetano, Leandro; Puerta, Pablo; Corbitt, Cynthia; Novacek, Michael J. (2007). "First Jurassic triconodont from South America". American Museum Novitates (3580): 1–17. doi:10.1206/0003-0082(2007)3580[1:FJTFSA]2.0.CO;2. hdl:2246/5873. S2CID 85676529.
3. ^ Gaetano, Leandro C.; Rougier, Guillermo W. (July 2011). "New materials of Argentoconodon fariasorum (Mammaliaformes, Triconodontidae) from the Jurassic of Argentina and its bearing on triconodont phylogeny". Journal of Vertebrate Paleontology. 31 (4): 829–843. Bibcode:2011JVPal..31..829G. doi:10.1080/02724634.2011.589877. hdl:11336/68497. S2CID 85069761.
4. Averianov, A. O.; Lopatin, A. V. (February 2011). "Phylogeny of triconodonts and symmetrodonts and the origin of extant mammals". Doklady Biological Sciences. 436 (1): 32–35. doi:10.1134/S0012496611010042. PMID 21374009. S2CID 10324906. ProQuest 854984818.
5. Gaetano, Leandro C.; Rougier, Guillermo W. (December 2012). "First Amphilestid from South America: A Molariform from the Jurassic Cañadón Asfalto Formation, Patagonia, Argentina". Journal of Mammalian Evolution. 19 (4): 235–248. doi:10.1007/s10914-012-9194-1. hdl:11336/68489. S2CID 16988665.
6. Butler, Percy M.; Sigogneau-Russell, Denise (2016). "Diversity of triconodonts in the Middle Jurassic of Great Britain" (PDF). Palaeontologia Polonica. 67: 35–65.
7. Grossnickle, David M.; Polly, P. David (2013-11-22). "Mammal disparity decreases during the Cretaceous angiosperm radiation". Proceedings of the Royal Society B: Biological Sciences. 280 (1771): 20132110. doi:10.1098/rspb.2013.2110. PMC 3790494. PMID 24089340.
8. Morales-García, Nuria Melisa; Gill, Pamela G.; Janis, Christine M.; Rayfield, Emily J. (2021-02-23). "Jaw shape and mechanical advantage are indicative of diet in Mesozoic mammals". Communications Biology. 4 (1): 242. doi:10.1038/s42003-021-01757-3. PMC 7902851. PMID 33623117.

v t e 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? Kollikodon Kryoryctes? Sundrius †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 Theriimorpha †Acinacodus †Amphidon †Amphilestes †Aploconodon †Chaoyangodens †Comodon †Condorodon †Dyskritodon? †Fruitafossor? †Hakusanodon †Indotriconodon †Juchilestes †Jueconodon †Kemchugia †Kryptotherium †Liaoconodon †Liaotherium †Manchurodon †Nakunodon †Phascolotherium †Sangarotherium †Tendagurodon †Allotheria? Monotremata? †Gobiconodontidae Fuxinoconodon Gobiconodon Hangjinia Huasteconodon? Meemannodon Repenomamus Spinolestes †Jeholodentidae Jeholodens Yanoconodon †Klameliidae? Ferganodon Klamelia †Triconodontidae Alticonodon Arundelconodon Astroconodon Corviconodon Eotriconodon Jugulator Meiconodon Priacodon Triconodon Trioracodon Victoriaconodon Volaticotheria? †Volaticotheria Argentoconodon Ichthyoconodon Triconolestes? Volaticotherium †Tinodontidae Gobiotheriodon? Tinodon Trishulotherium Yermakia Trechnotheria 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 Amazighodon Anoualestes Donodon Stylodens Prototribosphenida †Abelodon †Amphibetulimus †Amphitherium †Arguimus †Brancatherulum? †Chunnelodon †Magnimus †Minimus †Mozomus †Nanolestes †Palaeoxonodon †Vincelestes Monotremata? †Peramuridae Afriquiamus? Kouriogenys Peramuroides Peramus Tendagurutherium? Tribosphenida / Boreosphenida †Aegialodon †Argaliatherium †Brasilestes †Carinalestes †Eomaia †Holoclemensia †Hypomylos †Juramaia †Kermackia †Kielantherium †Pappotherium †Picopsis †Tirotherium †Tribactonodon 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

• Eutriconodonts
• Gliding animals
• Jurassic mammals of South America
• Jurassic Argentina
• Fossils of Argentina
• Cañadón Asfalto Formation
• Fossil taxa described in 2007
• Taxa named by Guillermo W. Rougier
• Taxa named by Alberto Garrido
• Taxa named by Leandro Gaetano
• Taxa named by Pablo F. Puerta
• Taxa named by Cynthia Corbitt
• Taxa named by Michael J. Novacek
• Monotypic prehistoric mammal genera