Below, you see a list with possible ichnogenera for an actively filled, unlined (sub)horizontal, branched burrow with a laminar appearance or U- or J-shape. Click on them to get detailed descriptions of the ichnogenus and a list of its ichnospecies. (Please allow for pop-up windows):

• Ilmenichnus (Taxonomic status unclear, use not recommended; ichnogenus usualle unbranched, but may be branhed)
• Rhizocorallium (Ichnogenus usually unbranched, but may be branched)