phylotypic stage

The phylotypic stage is a specific point during development when many different species' embryos look very similar, reflecting their common evolutionary origins. For example, during this stage, vertebrate embryos (like fish, birds, mammals) share key features such as a notochord and pharyngeal arches. This stage occurs after initial growth phases and before they branch into their unique adult forms. It reveals how animals are related and highlights the conserved processes in evolution, showcasing the deep connections among various species during early development.