|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Mammalia - Ungulata - Camelidae
It was recombined as Protolabis angustidens by Matthew (1901), Cope and Matthew (1915), Galbreath (1953) and Lewis (1968); it was recombined as Alticamelus angustidens by McGrew (1938); it was synonymized subjectively with Protolabis heterodontus by Webb (1969) and Frick and Taylor (1971).
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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.