plesiadapiformes
- Paraphyletic
- Northern hemisphere
- Primate features: Entotympanicum absent + talon upper molar
- non-strepsirhini features: long snout + eyes lateral + no postorbital bridge + rodent like dentition (diastema) + non-opposable pollex
Strepsirhini in general
Orbita:
- still a lot lateral
- no fovea centralis (nocturnal)
- tapetum lucidum (nocturnal)
- post orbital bridge, but orbita not closed yet
olfaction important
jaws:
-mandibular symphysis
small brain
opposable hallux
nails (claws second toe)
Adapiformes
diurnal
northern hemisphere
- snout reduces
- orbita frontal
- vision > olfactory
- brain larger
- no mandibular symphysis
Lemuriformes
- Madagascar, but originated mainland africa
- annulus tympanicus hangs freely in cavity of middle ear bones
- claws
- grooming combs
Lorisiformes
Africa and Asia
- LARGE orbita
- grooming combs
- Lorisidae (constant grip)
- Galagonidae (jumpers)
Haplorhini
- larger body + brain
- social complexer
- diurnal
- vision -> frontal bones fused + orbita closed off
- no symphysis mandibula
- inner ear: annulus tympanicus fused to bulla tympanica -> ectotympanic bone
- no claws
- quedrupedal running, brachiation and bipedal walking
Omomyiformes
- small
- nocturnal w large orbita
- small brain
- ectotympanicum form meatus
Tarsiiformes
Strepsirhini features:
- mandibular symphysis
- small brain
- claws
Haplorhini features:
- short snout
- placenta haemo-chorialis
- Diurnal features but lifestyle is nocturnal -> orbita large
- postorbital constriction present
- Ectotympanicum forms meatus
Platyrrhini
-dichromatic
- ectotympanicum forms annulus tympanicus
- orbita partially seperated from temporal fenestra
- alisphenoid seperated from frontale
Catarrhini
-trichromatic
- ectotympanicum forms annulus tympanicus -> meatus
- orbita seperated from TF
- alisphenoid contacts frontale
- quedrapedal
- sexual dimorphism
