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Lambdaconus colombianus

Mammalia - Ungulata - Proterotheriidae

Taxonomy
Neodolodus colombianus was named by Hoffstetter and Soria (1986). Its type specimen is MNHN VIV 9, a mandible (Right hemimandibular fragment, with P3-M3 in place), and it is a 3D body fossil.

It was recombined as Prothoatherium colombianus by Cifelli and Guerrero (1989); it was recombined as Lambdaconus colombianus by Carrillo et al. (2018).

Synonymy list
YearName and author
1986Neodolodus colombianus Hoffstetter and Soria p. 1620 fig. 1
1989Prothoatherium colombianus Cifelli and Guerrero
2018Lambdaconus colombianus Carrillo et al.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
phylumChordataHaeckel 1847
subphylumVertebrata
superclassGnathostomata
Osteichthyes()
Sarcopterygii
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
Tetrapoda()
Reptiliomorpha
Anthracosauria
Batrachosauria()
Cotylosauria()
Amniota
RankNameAuthor
Synapsida()
Therapsida()
infraorderCynodontia()
Epicynodontia
infraorderEucynodontia
Probainognathia
Mammaliamorpha
Mammaliaformes
classMammalia
subclassTribosphenida()
infraclassEutheria()
orderUngulata(Linnaeus 1766)
suborderLitopterna(Ameghino 1889)
suborderLopholipterna
familyProterotheriidaeAmeghino 1887
genusLambdaconus
speciescolombianus()

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
R. Hoffstetter and M. Soria 1986Didolodontidae a little smaller than D. multicuspis, half less than M. molariformis. Molar and premolar brachyodonts and bunodonts. P3P4 more elongated than in these two species; Highly advanced P4 molarization; A little less in P3, which is remarkably narrow and long; Paraconide present on P3 P4. M1-M3 without paraconide, but with a short preprotocristide: independent entoconide; No mesoconide, but a "cristida" obliqua as with Ernestokokenia. Dimensions (mm). - Length x width ant. (Trigonide) x post width. (Talonide): P3 8.2 x 4.2 x 4.5: P4b 7.5 x 5.2 x 5.6; M1 6.5 x 5.4 x 5.8; M, 7.5 x 6.2 x 6.5; M3 8.0 x 6.0 x 5.6. Length P3-M1 = 41.7.
R. L. Cifelli and J. Guerrero 1989Smallest known species of genus and of family Proterotheriidae. Cheek teeth similar in most respects to those of P. lacerum and P. scamnatum, but P3-4 mesostyle generally not as well developed as in those species. Distinct from P. lacerum in lacking P3 entoconid and from P. scamnatum in having small hypocone and metaconule on M3; distinct from these and all other species of Proterotheriinae in having lower-crowned cheekteeth.