serial homology
Quick Summary
Serial homology refers to the resemblance between different members of a single series of structures within an organism. These structures share a common evolutionary origin but may have evolved to perform different functions.12
For example, the jointed appendages of arthropods, such as crayfish, are an elaborate illustration of serial homology. These appendages, though built on a similar basic pattern, serve diverse functions like sensing, chewing, walking, and swimming. Similarly, the arms and legs of humans, or the vertebrae in mammals, are considered serially homologous. This concept is distinct from analogy, which describes functional similarities not based on common ancestry.32
Ask Britannica AI about this topic
Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.
