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Protypotherium compressidens

Mammalia - Notoungulata - Interatheriidae

Taxonomy
Protypotherium compressidens was named by Ameghino (1891) [Fernández et al. (2023) present images and measurements of the specimens (Figs 5, 6, 8E–K; Supporting Information, Table S2).]. Its type specimen is MACN-A 4029, and MACN-A 4030, a maxilla (left maxillary fragment with P3–M3; and left mandibular fragment with p4 (talonid)–m3, of the same individual), and it is a 3D body fossil.

It was synonymized objectively with Protypotherium praerutilum by Sinclair (1909).

Synonymy list
YearName and author
1891Protypotherium compressidens Ameghino p. 6
1894Protypotherium compressidens Ameghino p. 13
2023Protypotherium compressidens Fernández et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—AfrotheriaStanhope et al. 1998
—Paenungulatomorpha
—PaenungulataSimpson 1945
—Sudamericungulata
orderNotoungulata
suborderTypotheriaZittel 1892
familyInteratheriidae(Ameghino 1887)
genusProtypotheriumAmeghino 1882
speciescompressidens

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.

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Diagnosis
ReferenceDiagnosis
M. Fernández et al. 2023Extended diagnosis: Protypotherium compressidens differs from Pr. antiquum, Pr. australe, Pr. praerutilum, Pr. columnifer, Pr. claudum, Pr. minutum, and Pr. colloncurensis by narrower cheek teeth, even more noticeable in P2–M3; from Pr. antiquum by the talonid of m3 without a labial groove; from Pr. colloncurensis and Pr. columnifer by the talonid of p2–4 sub-triangular in outline; from Pr. claudum by having p2–3 with a distinctive entoflexid; from Pr. colloncurensis by a descending process of the maxilla with a moderate development; from Pr. praerutilum by having a larger size; from Pr. minutum and Pr. distinctum by less cement covering the cheek teeth, the P2–4 with an entoflexus located in a more distal position that is slightly less expanded, M1–3 with straighter ectolophs, and infraorbital foramen above premolars; from Pr. columnifer by the talonid of p4 narrower than the trigonid; and from Pr. antiquum by the talonid of m3 without its labial groove.