Below, you see a list with possible ichnogenera for a lined (sub)horizontal, unbranched burrow with a cylindrical cross section or a ridge-like appearance 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):

• Ancorichnus
• Beaconites (Taxonomical status unclear, use not recommended)
• Ereipichnus
• Macaronichnus
• Protovirgularia (May also be unlined or without mantle; may also occur as surface trace (track, trail, impression, etc.); ichnogenus includes ornamented ichnospecies)
• Scoyenia (May also be unlined or without mantle; ichnogenus includes ornamented ichnospecies)
• Trichophycus (Ichnogenus includes ornamented ichnospecies)
• Wenganichnus (Ichnogenus includes ornamented ichnospecies)