👉 Plesiomorphous refers to a type of morphological structure that is not derived from another type. It is often used in evolutionary biology and anthropology, as it describes a system of characteristics or traits that are shared among different species but have never been observed to be present in any living organism. For example, the plesiomorphous traits of a primate may include features such as long necks, large ears, and complex facial features, which are not found in all primates.
