Size of Mastoid Combined Braincase Sagittal Process Flat Nasal Bones Length Width of 4 Protruding Canine Premolar Crest or Arched or Mandible Incisors Canine Diastema and Molar Species FB SS (Y/N) Protruding Flat (cm) (cm) (Y/N) (Y/N) (cm) Yes Flat 7.0 1.1 No No 3.9 Protruding Paranthropus boisei 13.2 11.0 Australopithecus Yes Flat 5.8 1.4 No No 2.7 Protruding 11.0 10.1 afarensis Yes Flat 6.2 1.4 Yes Yes 2.6 Flat Pan troglodytes 9.9 10.2 Yes Yes Flat 7.4 1.4 Yes 3.7 Flat Gorilla gorilla 11.0 10.4 No Yes 5.0 1.1 No No 2.5 Protruding 14.9 12.8 Homo erectus Homo No Arched 5.8 1.4 No No 2.2 Protruding 16.8 14.9 neanderthalensis No Protruding Arched 4.4 1.1 No No 2.0 16.6 15.0 Homo sapiens
Species Size of Braincase FB SS Sagittal Crest (Y/N) Mastoid Process Flat or Protruding Nasal Bones Arched or Flat Length Mandible (cm) Width of 4 Incisors (cm) Protruding Canine (Y/N) Canine Diastema (Y/N) Combined Premolar and Molar (cm) Paranthropus boisei 13.2 11.0 Yes Protruding Flat 7.0 1.1 No No 3.9 Australopithecus afarensis 11.0 10.1 Yes Protruding Flat 5.8 1.4 No No 2.7 Pan troglodytes 9.9 10.2 Yes Flat Flat 6.2 1.4 Yes Yes 2.6 Gorilla gorilla 11.0 10.4 Yes Flat Flat 7.4 1.4 Yes Yes 3.7 Homo erectus 14.9 12.8 No Protruding Yes 5.0 1.1 No No 2.5 Homo neanderthalensis 16.8 14.9 No Protruding Arched 5.8 1.4 No No 2.2 Homo sapiens 16.6 15.0 No Protruding Arched 4.4 1.1 No No 2.0
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