Primate evolution
Transcript of Primate evolution
PRIMATE EVOLUTION
The Paleocene Epoch~65-55 mya
65mya dinosaurs disappear New forest floor niches
Primates diverge from some ancestral insectivore
Tree shrew model Arboreal vs. visual
predation theory
ARCHONTA
Scadentia, Dermoptera (colugos), Plesiadapiformes
Bats are out
Eocene Epoch(~55-35 mya)
Earliest fossils Majority in North America
& Europe but also AsiaProsimian radiation Angiosperm adaptive
radiation / P-E thermal maximum
Adapoidea More primitive Diurnal Medium-sized
arboreal leapers
Frugivory with some folivory
Ancestral to strepsirhines
Omomyoidea
Nocturnal Smaller Arboreal leapers Insectivore/frugivores
and gumnivory Ancestor to tarsiers,
possibly anthropoids
Prosimians spread into Africa Motor to Madagascar Shangiladida!...until humans migrate
Fill variety of niches Bats Woodpeckers
Late Eocene / Early Oligocene
10my of tectonic, climatic, floral/faunal change
Temperatures drop Primates disappear from
NA and Europe High extinctions elsewhere
E-O evolutionary bottleneck
Few fossils Primarily Fayum
AdapoidAdapoidOmomyoidOmomyoidTarsierTarsierAncient/otherAncient/other
ASIA OR NORTH AFRICA?ASIA OR NORTH AFRICA?
Siamopithecus
Eosimias
EosimiasEosimias: The Dawn Monkey: The Dawn Monkey
Prosimians outside Madagascar go extinct, except…
WHY?
Oligocene Epoch (~35-24 mya)
Anthropoid radiation
Three families: I. Parapithecidae
Most primitive Thought ancestral to NW
monkeys
II. Oligopithecidae Intermediate
III. Propliopithecidae Most derived Generalized anthropoid Ancestral to OW anthropoids
Sea level low More exposed
land Continental
shelves Ridges…
Currents Computer
modeling - weeks
NEW WORLD MONKEYS
Apidium
Small, squirrel-sized, leaping arboreal quadruped
2-1-3-3 dental formula
Precede appearance in New World by 10mya
Rodents in NW appear around same time and resemble African porcupine
•Few fossils
•Many have not changed much
OW Anthropoid Phylogeny
Aegyptopithecus / Propliopithecus Note: no tail
OW monkeys likely diverged late Oligocene Adaptive radiation continues
During early period, apes successful and radiation of OW monkeys was slow
Begin to flourish after apes begin to decline
More generalized/successful Derived terrestriality Shorter life stages
Not as tied to forest so survive when apes die out in late Miocene
May have contributed to ape decline
Miocene Epoch(~24-5 mya)
Hominoid Radiation
Evolve in Africa Spread into Eurasia via land bridge ~16mya
Large geographic
range relative to modern
Warmer than Oligocene But seasons more
pronounced Increasing aridification
Rain shadow Forests change Hominoids fill niches
Early Miocene (24-16mya) African Hominoids
Fossils primarily from Kenya and Uganda Multiple genera
Different habitats Tropical to more open
woodland
Different sizes (3-50kg) Some arboreal some derived
terrestrial adaptations for exploiting forest floor (like Pan & Gorilla)
Different locomotor patterns Different morphology Some SHA
Different diets Thick enamel – hard foods Thin enamel – softer foods
Best known Our ancestry Arboreal climbers No SHA Primarily frugivores Sexually dimorphic
~chimps Polygynous
Kenyapithecus or Afropithecus?
Proconsul
HAND/FOREARM OF P. HESELONI
LOWER LEG P.HESELONI, PAN,
and P. NYANZAE
Links to modern hominoids (long bones, no tail) but so primitive, difficult to trace ancestry through any of these early apes.
Proconsul
70-150# Arboreal
quadruped Lacking
SHA
Gigantopithecus
(Size of ♀ gorilla?)
Ancestry of Hylobatidae uncertainpossibly diverged 16-18mya
Mid-Miocene (16-11)Rapid radiation in Eurasia
Dryopithecus
•Few fossils
•Jaws and teeth
•France, Spain, Italy, Greece, Austria
Dental (Oak) apes
LATE MIOCENE (11-5mya)
Greatest diversity of hominoidsEurope: Dryopithecus, Oreopithecus,
OaranopithecusAsia: Ankarapithecus (Turkey), Sivapithecus
(Pakistan), Lufengpithecus (China)Africa: Otavipithecus (Namibia)
NEWSFLASH!!!
Nakalipithecus nakayamai Kenya~10myaPossible missing link