|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Ungulata - Proterotheriidae
It was recombined as Prothoatherium colombianus by Cifelli and Guerrero (1989); it was recombined as Lambdaconus colombianus by Carrillo et al. (2018).
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.
|R. Hoffstetter and M. Soria 1986||Didolodontidae 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 1989||Smallest 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.|