What is the name for any primate that walks on two legs?

There isn't a specific name for any primate that walks on two legs.

Here's why:

* Bipedalism is a spectrum: Primates don't all walk on two legs in the same way. Humans are the only obligate bipeds, meaning we walk upright all the time. Other primates, like chimpanzees, can walk bipedally for short periods but are primarily quadrupedal.

* Terminology is complex: While terms like "bipedal" or "biped" are used to describe primates that walk on two legs, they are more commonly used in a scientific context to describe the mode of locomotion.

Instead of a specific name, you can describe the primate based on their behavior:

* Obligate biped: This refers to a primate that walks on two legs all the time.

* Facultative biped: This refers to a primate that can walk on two legs, but does not do so regularly.

* Bipedalism: This is a general term describing the act of walking on two legs.

Therefore, there isn't one specific name for any primate that walks on two legs. Instead, we use terms that describe the type and extent of their bipedal locomotion.