Rhizopoterion tubiforme
Schrammen 1910
Rhizopoterion tubiforme is an uncommon species at Höver and is almost absent in the Upper Campanian of Misburg. Rhizopoterion tubiforme is similar to the more common Ventriculites sp., but has a thicker wall (up to 10 mm), more slit-like and less systematically arranged ostia and more pronounced longitudinal ridges on its dermal side.