Below, you see a list with possible ichnogenera for an unlined (sub)horizontal, unbranched burrow with a trilobate cross section and passive filling. Click on them to get detailed descriptions of the ichnogenus and a list of its ichnospecies. (Please allow for pop-up windows):

• Fehmarnichnus* (Taxonomic status unclear, use not recommended)
• Svalbardichnus (Ichnogenus includes ornamented ichnospecies)

* In contrast to Knaust (2012), we see in Fehmarnichnus a nomen nudum.