Supplementary Table 1 Current sample detailed information Species collection code HOMINOIDEA Homo sapiens Zilles 14686 Homo sapiens Zilles 1696 Homo sapiens Zilles 18992 Homo sapiens Zilles 20784 Homo sapiens Zilles 28193 Homo sapiens Zilles 295 Homo sapiens Zilles SN382/81 Homo sapiens Zilles 54491 Homo sapiens Zilles 5694 Homo sapiens Zilles 6895 Pan troglodytes‡‡ Zilles 1548 Pan troglodytes Zilles 4/97 Pan troglodytes Zilles Schimp 1 Pan troglodytes Zilles YN89-278 Pan troglodytes‡‡ Yakovlev-Haleem3.1.1.0.1 Pan troglodytes‡‡ Yakovlev-Haleem3.1.1.0.3 Pan paniscus Zilles YN86-137 Pan paniscus†† Zilles 1/97 Pan paniscus GWU MCZ-2007-52 Gorilla gorilla Zilles YN82-140 Gorilla gorilla†† Stephan A375 Pongo pygmaeus Zilles 2/97 Pongo pygmaeus Zilles YN85-38 Pongo pygmaeus Zilles 5/97 Pongo pygmaeus Zilles 0459 Pongo pygmaeus GWU 100344 Hylobates lar Zilles YN81-146 Hylobates lar Zilles 3/97 Hylobates muelleri GWU 970431 Symphalangus syndactylus GWU 880804 CERCOPITHECOIDEA CERCOPITHECINAE Cercopithecus ascanius Stephan 219 Cercopithecus mitis GWU 201202 Cercopithecus mitis Stephan 261 Erythrocebus patas Stephan 1340 sex age body mass (kg) plane of section section thicknes s (µm) M M M M M F F F F F NA F F M F M F F F F M M M M F M F F M M 37 54 56 75 69 85 59 79 72 79 NA 24 22 22 NA 6 or 7 2 11 25 20 JUV 37 17 34 A 39 A 22 18.6 33 NA NA NA NA NA NA 61.4 NA NA NA NA 80.00 50.00 53.00 6.80 20.41 10.40 NA NA 84.70 22.00 114.00 58.00 140.00 NA NA 4.00 6.80 9.16257 7.26 coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal horizontal sagittal sagittal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal coronal 20 20 20 20 20 20 20 20 20 20 20 20 20 20 35 35 20 20 40 20 20 20 20 20 F M M F A A A A 3.3 NA 7.00 5.80 coronal coronal coronal coronal 20 40 20 20 40 20 20 40 40 Lophocebus albigena Macaca fascicularis Macaca mulatta§§ Macaca mulatta§§ Miopithecus talapoin Papio anubis Papio anubis COLOBINAE Nasalis larvatus Pygathrix nemaeus Procolobus badius** Procolobus badius** Colobus angolensis Stephan Zilles Stephan Zilles Stephan Stephan Stephan 242 ma22 476 mm4 1171 251 97 M M NA NA M M F A 3 NA A A A A 9.25 2.90 NA 2.90 1.38 35.00 21.00 coronal coronal coronal horizontal coronal coronal coronal 20 20 20 20 20 20 20 Stephan Stephan Stephan Stephan GWU 1365 1364 213 216 M00652 F F F F M A A A A 18 NA 4.00 7.50 8.25 NA coronal coronal coronal coronal coronal 20 20 20 20 40 *Nissl stain (Ag, cresyl violet, or thionin) was preferred. Myelin and MR sections were only used in cases of poor Nissl stain †All measurements (brain, V1, and LGN) were taken on myelin-stained sections only. ‡Myelin sections were used to assist where Nissl (cresyl violet or thionin stain) stain was inadequate or missing. §LGN was measured solely on high strength (7T) magnetic resonance scans taken on the brain before processing. V1 was me on cresyl violet stained sections, with MR sections used to correct for missing sections. **the LGN vol. is the published average for 213 and 216, duplicated for each specimen, as the individual volumes are no long ††Juveniles omitted from analyses ‡‡Missing brain weights - ommitted from analyses §§Combined complimentary data from both M. mulatta specimens in analyses stain* corrected brain mass brain volume LGN vol. LGN volume (g) (cm3) (cm3) source subleafletin number of parvocellular g/ layers and leaflets subsidiary Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag Ag myelin† Nissl‡ Ag Ag cresyl violet§ Ag cresyl violet Ag Ag Ag cresyl violet cresyl violet Ag Ag cresyl violet cresyl violet 1437.00 1757.00 1270.00 1349.00 1360.00 1046.00 1142.00 1350.00 1216.00 1110.00 NA 359.50 440.00 420.00 NA NA 392.00 324.00 337.00 376.00 450.00 440.00 369.00 345.00 190.00 397.80 92.00 120.00 101.80 138.70 1387.07 1695.95 1225.87 1302.12 1312.74 1009.65 1102.32 1303.09 1173.75 1071.43 264.99 347.01 424.71 405.41 261.11 276.81 378.38 312.74 325.29 362.93 434.36 424.71 356.18 333.01 183.40 383.98 88.80 115.83 98.26 133.88 0.377 0.538 0.340 0.340 0.336 0.209 0.272 0.371 0.254 0.313 0.172 0.336 0.349 0.345 0.142 0.160 0.306 0.261 0.259 0.300 0.317 0.274 0.184 0.319 NA NA 0.153 0.179 0.162 NA de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20104 leaflets de Sousa et al. 20102 undivided layers de Sousa et al. 20102 undivided layers de Sousa et al. 20102 undivided layers NA 2 undivided layers NA 2 undivided layers de Sousa et al. 20102 undivided layers de Sousa et al. 20102 undivided layers this study 2 undivided layers NA 2 undivided layers cresyl violet cresyl violet cresyl violet cresyl violet 61.50 71.60 75.00 94.20 59.36 69.11 72.39 90.93 0.147 0.184 0.150 0.267 Stephan et al. 19844 leaflets this study 4 leaflets Stephan et al. 19844 leaflets this study 4 leaflets Y Y Y Y cresyl violet Ag cresyl violet Ag cresyl violet cresyl violet cresyl violet 110.50 57.60 78.00 NA 41.10 222.00 191.00 106.66 55.60 75.29 55.60 39.67 214.29 184.36 0.182 0.092 0.158 NA 0.109 0.395 NA Stephan et al. 19844 leaflets de Sousa et al. 20104 leaflets Stephan et al. 1984NA this study 4 leaflets Stephan et al. 19844 leaflets Stephan et al. 19844 leaflets NA NA cresyl violet cresyl violet cresyl violet cresyl violet cresyl violet 64.25 69.00 78.70 75.00 74.4 62.02 66.60 75.97 72.39 71.81 0.157 0.115 0.128 0.128 0.103 this study 4 leaflets this study 2 undivided layers Stephan et al. 19842 undivided layers Stephan et al. 19842 undivided layers this study 4 leaflets nly used in cases of poor Nissl stain, as noted. nadequate or missing. rain before processing. V1 was measured the individual volumes are no longer available. Y Supplementary Table 2. Regression of LGN volume as a function of brain volume. Lower Upper 95% Cl 95% Cl p Regression slope R2 species mean LS independent contrasts LS species mean RMA 0.406 #### 0.267 0.489 #### 0.241 0.489 #### 0.369 0.545 0.738 0.647 intercept n 0.000 -1.590 0.000 -1.785 0.000 -1.765 19 18 19
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