👉 Primigen, also known as primitive, is a term used in biogeography and evolutionary biology to describe organisms that are considered to be lacking essential or fundamental characteristics of their environment. These organisms are often referred to as "primitive" because they lack certain traits such as specialized structures, adaptations, or functional capabilities that are necessary for survival in their native environments. Primitive organisms are sometimes categorized into two main groups: the fossil record and the fossil record of the modern-day world. The fossil record is
