Rusophycus
Rusophycus is a trace fossil allied to Cruziana. Rusophycus is the resting trace, recording the outline of the tracemaker; Cruziana is made when the organism moved. The sculpture of Rusophycus may reveal the approximate number of legs that the tracemaker had, although striations from a single leg may overlap or be repeated.
Both Rusophycus and Cruziana are typically associated with trilobites but can also be made by other arthropods. Rusophycus is known from sediments dating to the earliest Cambrian Period, and from the Triassic Period, indicating that other producers could make the trace.
