Below, you see a list with possible ichnogenera for a cylindrical, lined or unlined, passively filled, (sub)vertical, branched burrow. Click on them to get detailed descriptions of the ichnogenus and a list of its ichnospecies. (Please allow for pop-up windows):

• Camborygma (Ichnogenus includes ornamented ichnospecies)
• Trichichnus (Ichnogenus usually unbranched, but may be branched)