Spriggina

Spriggina is an extinct, soft-bodied organism from the Precambrian and early Cambrian periods, often considered one of the earliest known animals. Its body was elongated and segmented, resembling a small worm or relative of early arthropods. Fossil impressions suggest it had a head with a structure resembling a pair of eyes or sensory organs. Because of its features, Spriggina provides important clues about the evolution of early animals and the development of complex body plans. It offers insight into the origins of the animal kingdom during a crucial time when life was transitioning from simple to more complex organisms.