Below, you see a list with possible ichnogenera of a lined (sub)horizontal, unbranched burrow with a laminar appearance or a U- or J-like shape having a passive filling. Click on them to get detailed descriptions of the ichnogenus and a list of its ichnospecies. (Please allow for pop-up windows):

• Artichnus (Ichnogenus includes ornamented ichnospecies)
• Keilorites (Taxonomic status unclear; ichnogenus includes ornamented ichnospecies)