Trace fossil
Helminthopsis is the ichnogenus of a type of trace fossil that is found preserved on the bedding planes of fine-grained sedimentary rocks. It is characterized by short, curvilinear, non-branching, parallel-sided, unlined traces on bedding surfaces. It is thought to represent the submarine feeding trails of an invertebrate organism that worked the surface of muddy substrates in search of food. Because "Helminthopsis" traces never cross over themselves, the ichnogenus is distinguished from similar traces assigned to the "Gordia" ichnogenus. The similar sounding, but now obsolete, ichnogenus "Helminthoida" refers to a somewhat similar trace characterized by regular, back-and-forth meanders, whereas "Helminthopsis" traces are irregular.
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