Tombownichnus plenus Mikuláš et Genise, 2003

Diagnosis. Circular to subcircular holes, or paraboloid external pitsoccurring in discrete (constructed) walls of chambers madeof agglutinated soil material. Asingle hole, despite its size,is not diagnostic for this ichnogenus, which can be identified only when more than one hole is present. If the cham-ber shows a single large hole and one or more smaller ones,the former should be considered as part of the substrate (i. e. the constructed chamber). On the contrary, a singleexternal pit is diagnostic for this ichnogenus.