What is special about Pikaia?

Pikaia is a significant fossil from the Cambrian period, approximately 505 million years ago, notable for being one of the earliest known chordates, which are animals with a backbone. It resembles a primitive fish and exhibits key features such as a notochord, a precursor to the backbone, and a segmented body structure. Pikaia provides crucial insights into the evolution of vertebrates, highlighting the transition from invertebrates to more complex life forms. Its discovery helps scientists understand the early stages of animal evolution and the development of key anatomical features.