Perikymata counting was carried out on the virtual three-dimensional models of the Xujiayao teeth, reconstructed from the 6.34-μm data PPC-SRμCT scanning using VGStudio 2.2 and VGStudio MAX 3.0. For each tooth, a series of eight views were generated all around the tooth for general perikymata assessments. Among these views, we observed the labial or buccal surfaces of I1 and C′, the buccal cusp of P3, the buccal cusp of P4, and the mesiobuccal cusp of M1 and M2, as well as the distolingual cusp of M2. The interobserver error of perikymata counting varied from one to five (Table 1). For comparison to other hominins in total perikymata numbers and percent perikymata in the cervical region of the tooth, only one set of perikymata counts was used—the set calculated by S.X., M.O., and D.G.-S. It is this set that is most comparable to the comparative datasets in which D.G.-S. was involved.

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