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

• Chagrinichnites (May also occur as surface trace (track, trail, impression, etc.); ichnogenus includes ornamented ichnospecies)
• Furnasichnus