What is the entire structure circled in red?   

Match primates with most exclusive (most specific) taxon.

A = Proximal end of the radius B = Distal end of the radius

Match locomotor adaptation with most inclusive taxon (each match will have a different answer). 

Body weight plays an important role in primate dietary adaptations.  For example …

Adapidae are ancestral to Strepsirhines because they have features such as external lacrimal ducts and open eye orbits. Omomyidae are ancestral to Haplorhines because they have wet noses.

The sagittal keel first appears in Homo erectus.

Both “focal animal” and “ad libitum” data may be collected when conducting a timed-sample study.

The Propliopithecid species known as Aegyptopithecus is well-represented and provides solid evidence of sexual dimorphism.

Match functional anatomy with locomotor adaptation.