Ardipithecus - ape men?
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01-06-2013, 03:58 PM
RE: Ardipithecus - ape men?
You are making so pretty severe errors with your assumptions and vocabulary.

You seem to understand the DIFFERENCE between bipedal locomotion and quadrupedal locomotion, but you are failing to grasp an important concept about the two.

Bipedal locomotion is not a trait found exclusively in human species. You'll notice birds--descended from Therapod Saurians--are ALSO bipedal. Additionally, FLIGHT is an important part of their locomotive model. Species are not limited to a SINGLE form of motion, but we do tend to use DOMINANT forms of locomotion to make important distinctions between animal groups.

For instance: Take your arm and rotate it around the entire range of motion in your shoulder. This form of movement is called "brachiation," and is something only apes can do. It is the dominant form of locomotion for Gibbons, but Gibbons are ALSO considered quadrupeds (when on the ground) though they can move short distances in a bipedal position.

Bipedal locomotion is common in Primates, but it is not their DOMINANT form of locomotion. Their pelvis, spine, and femurs are not oriented correctly in their body to accommodate moving long distances in a bipedal position. This is what makes the appearance of apes that move PRIMARILY through bipedal locomotion different--there are extreme physical differences that allow for that shift in locomotive patterns.

Ardi is LIKELY to be a transitional species that has not yet fully begun to adopt the biped-dominant model; that is what makes it such a tricky sample. It is also a mistake to assume that an artist's rendering is an accurate depiction of the ape's complete anatomy. For years, Victorian Scientists thought that Therapods were QUADRUPEDS, and were able to successfully render them so, but we now know they were in fact BIPEDS who could sometimes use their front appendages in a quadrupedal pattern.

Also, I recommend avoiding Wikipedia.

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02-06-2013, 04:25 AM
RE: Ardipithecus - ape men?
Korin, look up the words "obligate biped" and "facultative biped."
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07-06-2013, 10:53 AM
RE: Ardipithecus - ape men?
what do those words mean
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07-06-2013, 11:25 AM
RE: Ardipithecus - ape men?
(07-06-2013 10:53 AM)Korin Wrote:  what do those words mean

"Look up" means use Google or a book to discover things.

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