The following tables provide a systematic species inventory of sponges reported from the Campanian marl beds of Höver and Misburg. A number of species are reported here from Misburg and Höver for the first time, and there are a few completely new species which await formal description. The major sources of information on their occurrence are the work by Schrammen (1910-12, 1924), but also later articles and reports by paleontologically interested individuals. Valuable descriptions of fossil sponges are also the classical publications by Hinde (1883), Moret (1926), Rauff (1893), Roemer (1841, 1864), Zittel (1878) and several other hard-to-get publications.

For all the presented specimens, macroscopic features as well as microscopic evidence from the skeletal structure has been considered, and in some cases it has also been possible to directly study type material for comparison. However, in many cases the identification has to rely on the sometimes insufficient descriptions published in the literature.

The taxonomic classification originally adopted was that of the Treatise on Invertebrate Paleontology, Part E by De Laubenfels (1955). However, while this website was in preparation, a revised volume of the Treatise appeared (Finks et al., 2004), with a substantially different classification, including the introduction of the taxa "Subclass", "Superfamily", "Subfamily" and "Subgenus", which in turn entailed extensive redefinition and renaming of taxa. In principle, both classification schemes are equally valid, but put different emphasis on certain aspects such as nature of scleres and skeletal organization, internal canalization, or macroscopic habit. Both schemes also differ from proposed schemes for modern sponges. - For this revised website,it was decided to give priority to the more recent classification of fossil sponges by Finks et al. (2004), and in particular by Reid (2004), who wrote the chapters on Mesozoic sponges in the Treatise on Invertebrate Paleontology. The scheme by De Laubenfels (1955) will be maintained as a supplement.

The following tables are according to the classification of
De Laubenfels (1955)