Treptichnus pedum (formerly Phycodes pedum, Manykodes pedum by J. Dzik, or most of the time named Trichophycus pedum) is the preserved burrow of an animal rather than a fossil of that animal. As such, it is regarded as the earliest widespread complex trace fossil. Its earliest appearance, around 542 mya, which was contemporaneous with the last of the Ediacaran biota, is used to help define the dividing line, considered geologically at 541 mya, between the Ediacaran and Cambrian Periods. The name Treptichnus pedum means "turned-trail (Greek) of feet (Latin)".