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Argentoconodon fariasorum

Mammalia - Eutriconodonta - Triconodontidae

Taxonomy
Argentoconodon fariasorum was named by Rougier et al. (2007). Its type specimen is MPEF PV 1877, a tooth, and it is not a trace fossil. Its type locality is Queso Rallado, near Cerro Cóndor, which is in a Toarcian/Bajocian lacustrine mixed carbonate-siliciclastic in the Cañadón Asfalto Formation of Argentina. It is the type species of Argentoconodon.

Synonymy list
YearName and author
2007Argentoconodon fariasorum Rougier et al. p. 4 fig. 3,4
2011Argentoconodon fariasorum Gaetano and Rougier p. 832 figs. 2-4

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
RankNameAuthor
Amniota
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
orderEutriconodontaKermack et al. 1973
familyTriconodontidaeMarsh 1887
subfamilyAlticonodontinaeFox 1976
tribeVolaticotherini()
genusArgentoconodon
speciesfariasorum

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
L. C. Gaetano and G. W. Rougier 2011Triconodont with imbricated upper and lower molariforms, imbrication also present in posterior premolariforms. Simple unicuspated incisors. Canines taller than other teeth, lower ones uniradiculated and conical, upper canines with a constricted root and more labiolingually compressed. Premolariforms without mesial accessory cusps and cingula, with one simple or constricted root or two roots. Molariforms extremely labiolingually compressed and lacking conspicuous cingula. Upper molariforms pentacuspidated with three main cusps (A, B and C) and two accessory cusps (D and E). Cusp A subequal or taller than cusp C, both distally recumbent. Cusp B almost erect and lower than cuspsAand C.Accessory cusps (Dand E) project from the base of the crown. Lower molariforms with four cusps. Main cusps (a, b, and c) strongly recumbent.Distal accessory cusp (d) overhanging distally as a flange-like projection. Comparison of Argentoconodon with its close allies reveals the following differences: premolariforms of Argentoconodon differ from those of amphilestids and other tricondontids for lacking a mesial accessory cusp; lower molariforms of Argentoconodon differ from those of Volaticotherium and other non-Volaticotherini alticonodontines for lacking well-developed cingula and having main cusps separated by wider valleys; further differences with non-Volaticotherini alticonodontines includes more labiolingually compressed lower molariforms bearing four cusps (a–d) that are not subequal and are set apart by relatively wide valleys; discrepancies with the lower molariforms of Ichthyoconodon also comprise cusp proportions and recumbence; upper molariforms of Argentoconodon are distinguished from those of Volaticotherium for the presence of well-developed cusps D and E and cusp B less recumbent than the other main cusps; and unlike Corviconodon and Astroconodon, in Argentoconodon cusps A–D are well separated, cusp E is present, cusp D is proportionally lower than the main cusps and overhangs distally, and cingula are absent; Argentoconodon differs from Priacodon, Trioracodon, and Triconodon in having more labiolingually compressed molariforms with more recumbent main cusps and lacking well-developed cingula, and by the presence of cusp E in upper molariforms.