A more thorough explanation:

COMMUNIS STIPES

Communis stipies is a Latin term that means "common trunk." In history, it refers to a common ancestor.

For example, if two people are related to the same ancestor, that ancestor is their communis stipies.

Another example is if two different species have a common ancestor, that ancestor is their communis stipies.

The examples illustrate how communis stipies refers to a common ancestor. In the first example, two people share a common ancestor, and that ancestor is their communis stipies. In the second example, two different species share a common ancestor, and that ancestor is their communis stipies. The term is used to describe the shared ancestry between different individuals or groups.