Helminthopsis
Encyclopedia
Helminthopsis is an ichnogenus that is distinguished from the curving, parallel-sided, unlined Gordia
because it never crosses over itself.
Gordia
Gordia marina is a lower Cambrian ichnofossil, and is the most common trace fossil in the Kaili biota. It is often associated with the remains of a variety of dead organisms , suggesting that it was made my a scavenging worm-like creature...
because it never crosses over itself.