Extended Data Fig. 3: Digital proportions in KNM-ER 101000.
a) natural log plot of the combined estimated length of the proximal pollical phalanx (mPP1) and distal pollical phalanx (mDP1) versus fifth metacarpal (Mc5 maximum length) with a least-squares regression line through the recent H. sapiens sample [ln(mPP1_length_+_mDP1_length) = 0.93 * ln(Mc5_maximum_length) − 0.32; p < 0.001, r2 = 0.69]; b) plot of mDP1 tuft RU breadth versus mDP1 maximum length a least-squares regression line through the recent H. sapiens sample [mDP1_tuft_RU_width = 0.19 * mDP1_maximum_length + 5.0; p < 0.01, r2 = 0.23]c) 3D surface model renderings of the KNM-ER 101000 digital specimens shown with relevant comparative specimens, which are all visually scaled to the same Mc5 maximum length as KNM-ER 101000. The central star in (a) includes the mean estimate for the mPP1 length and the upper and lower stars represent the 95% confidence interval of that estimate. Australopithecus sample: 1 = A. afarensis [plot in (a) includes AL 333-69 mPP1 + AL 333-159 mDP1 and mean of AL 333-14, AL 333-89, and AL 333-141 Mc5s and plot in (b) includes AL 333-159]. 2 = “A. prometheus” StW 573. 3 = A. sediba MH2. 4 = A. africanus StW 294.
