Transcript Slide 1
Ardipithecus ramidus
• Hominid who walked bipedally 4.4 mya • Discovered in 1992 by Tim White in Aramis, Ethiopia (as yet largely unpublished) • Distinct enough to be a new species?
– ape-like dentition – bipedal locomotion – overall hominid-like skeleton – small cheek teeth with thin enamel and large canines – arm bones are hominid-like – foramen magnum indicates bipedalism
The Varied Australopithecines
• • •
There are two major hominid genera: Australopithecus and Homo.
However, in 1992 Berhane Asfaw and Tim D. White discovered substantial remains considered to be from hominids ancestral to the australopithecines; these remains have been called Ardipithecus ramidus (thus establishing a third hominid genus) and dated a 4.4 m.y.a.
A more recent (1995, by Maeve Leakey and Alan Walker) discovery has been named Australopithecus anamensis and been dated at 4.2 m.y.a.
Pelves
A comparison of human and chimpanzee pelves.
Skeletons
Comparison of human and chimpanzee skeletons.
Crania Comparison
Dentition
Comparison of dentition in ape, human, and
A. afarensis
palates.
Australopithecines
Skulls of Robust (left) and Gracile (right) Australopithecines.
Early Hominids
Australopithecus afarensis
• • • • •
apelike features (long arms, prognathic face, toothrow, brain capacity) pelvis, leg, feet, and foramen magnum all indicate bipedalism 4.2 mya, with oldest definite specimen placed at 3.8 mya first discovered by Don Johanson in 1974 and called “Lucy” thought to be the “missing link” until A. anamensis was discovered 20 years later
Australopithecus afarensis
Left: Trail of footprints of
A. afarensis
made in volcanic ash, discovered by Mary Leakey at Laetoli.
Right: Close up of footprint at Laetoli
A. africanus
• 3.5 - 2.5 mya • 3.8 - 4.5 feet tall, 55-130 lbs • ape-like tibia, grasping big toes • wide pelvis, parabolic tooth row • primitive bipedalism • first found by Raymond Dart in Taung, South Africa in 1925
Map of Australopithecine Finds
Map of Australopithecus sites in Africa, with a focus on the East African rift valley and limestone caves of South Africa.
Hominid Evolution
• Major
Homo
advances: – Brain size – Better bipedalism – Hunting – Fire (
H. erectus
) – Tools • Oldowon (
H. habilis
) • Acheulean (
H. erectus
) • Mousterian (
H. heidelbergensis
) • Solutrean (
H. sapiens
) – Built shelters (
H. heidelbergensis
) – Clothing (
H. neandertalensis
) – Language (Neandertals?)
Homo habilis
Artist’s representation of a habilis Homo band as it might have existed two million years ago.
• 612 cc brain • 2.3 - 1.6 mya • first toolmaker • prognathic face, brow ridge • probable meat-eater • possibly arboreal • discovered in 1960 by Leakeys • no speech
H. habilis
v.
H. erectus
• Finds in east Africa indicate that
Homo habilis
was not very different from the australopithecines in terms of body size and shape.
• The earliest
Homo erectus
remains indicate rapid biological change.
– The fossil record for the transition from
H. habilis
to
H. erectus
supports the punctuated equilibrium model of evolution.
–
H. erectus
was considerably taller and had a larger brain than
H. habilis
.
Homo erectus
• 1891 - Eugene Dubois discovers
H. erectus
in Java • Dubois calls it
Pithecanthropus erectus
initially, also dubbed “Java Man” • finds in China called
Sinanthropus
• dates from 1.9 mya to 27,000 years B.P.
• 994 cc brain size (compare to 612 for
H. habilis
) • Acheulean tool industry Photograph of Nariokotome boy, an early Homo erectus Turkana, Kenya.
found near Lake
Homo neanderthalensis
• discovered in the Neander Valley (Tal) near Dusseldorf, 1856 • massive brain--about 1,400cc on average • large torso, short limbs, broad nasal passages • later remains show decrease in robustness of the front teeth and face, suggesting use of tools replaced teeth • retained occipital torus, some mid-facial prognathism The skull of the classic Neandertal found in 1908 at La Chapelle-aux Saints.
What happened to Neandertals?
•
H. neanderthalensis
coexisted with
H. sapiens
for at least 20,000 years, perhaps as long as 60,000 years • What happened?
– Neandertals interbred with
H. sapiens
– Neandertals were killed off by
H. sapiens
–
H. sapiens
drove Neandertals into extinction by competition
Cro-Magnon Man
• Cro-Magnon humans – 35,000 years B.P. in western Europe to 17,000 years B.P.
– 1,600 cc cranial capacity – Name comes from a hotel in France –
Not
a different species, just old
Homo sapiens
from Europe Artist’s reconstruction of a Cro-Magnon man
Homo sapiens
• Archaic – 100,000 to 35,000 years BP – Sometimes called
Homo sapiens
and
Homo sapiens neanderthalensis
• Modern – 35,000 years BP to present – Anatomically modern – Sometimes called
Homo sapiens sapiens