Distinguishing primate taxa with enamel incremental variables

Area of Science:

• Paleoanthropology
• Primate Paleontology
• Dental Anthropology

Background:

• Enamel incremental features are studied for their functional and phylogenetic significance in fossil hominins and primates.
• Previous research suggested these features could distinguish hominin fossil taxa for taxonomic purposes.

Purpose of the Study:

• To test enamel incremental data from closely related primate taxa to determine their taxonomic distinguishing capabilities.
• To assess the reliability of enamel incremental features for distinguishing fossil hominins from extant humans and apes.

Main Methods:

• Measured enamel incremental variables from the M2 of 40 living primate taxa.
• Utilized discriminant function analysis and jackknifing methods at various taxonomic ranks (parvorder, family, tribe, genus).
• Included fossil hominin data from Australopithecus and Paranthropus genera.

Main Results:

• Enamel incremental variables showed low classification rates among primate taxa.
• Significant overlap between groups was observed at all taxonomic ranks, indicating unreliability.
• Multicollinearity was present in multivariate analyses due to common enamel incremental growth variables.

Conclusions:

• Enamel incremental features are unreliable for distinguishing between closely related primate taxa and fossil hominins.
• The functional and phylogenetic significance of these features requires re-evaluation for taxonomic applications in hominin paleobiology.