- As the brain is small, brain case is smaller than the other primates.
- Well developed supra orbital crest is present.
- Post orbital bar is also completed.
- Tympanic bulla is reduced.
- Comparatively short face.
- Eyes are forwardly directed and large.
- All teeth are pointed.
- Incisors in upper jaw are small.
- Dental formula:- 2/2, 1/1, 3/3, 3/3
Gorilla- Gorilla gorilla
- Brain case is quite smaller comparing to the whole skull.
- Low brain capacity comparative to the other Anthropoides.
- Flat supra occipital bone.
- Supra orbital bone is prominent.
- Supra occipital, supra orbital and temporal crest are well developed for a strong muscle attachment.
- Gorilla is a carnivore animal. Therefore the canines are much elongated and sharp.
- Males have larger canines than the female.
- Dental arch is rectangular.
- Dental formula is 2/2, 1/1, 2/2, 3/3
Orang Utang- Pongo spp
- Brain case is smaller comparative to the whole skull.
- Rounded supra occipital bone.
- Supra orbital ridges are not much prominent as in gorilla.
- Supra occipital and temporal crests are well developed.
- Males have large canines.
- Molars are bilophodont.
- Dental formula:- 2/2, 1/1,2/2,3/3
Chimpanzee- Pan troglodyteq
- Brain case is not smaller comparing to the whole skull.
- Therefore the brain capacity is high.
- Skull surface is smooth and rounded.
- Supra occipital and temporal crests are absent.
- Snout is comparatively long.
- Dental arch is U shaped.
- Males have large canines.
- Dental formula:- 2/2, 1/1, 2/2, 3/3
Human- Homo sapiens sapiens
- Highest brain capacity is shown.
- Smooth and rounded skull.
- Chin is present.
- Flat facial area.
- Supra orbital ridges are much reduced.
- Deeply downward foramen magnum.
- Dental arch is U shaped.
- Canines are small.
- Dental formula:- 2/2, 1/1, 2/2, 3/3
