Brachiospongia - Photograph of this fossil sponge from the Ordovician in Kentucky.
Choia utahensis - Fossil sponges from the Cambrian in Utah showing the spicules of which the skeleton is composed.
Cretaceous Sponges - Documentation and systematic description of fossil Cretaceous sponges (porifera) from the Campanian of Misburg and Höver, Germany.
Pemmatites sp. - Photographs of several complete fossil sponges.
Raphidonema sp. - Photographs of fossil sponges from the Cretaceous.
Siphonia - Photographs and information on Siphonia subglobosa and Siphonia tubulosa and some photomicrographs showing typical tetraclones and one dermal dichotriaene of Siphonia tubulosa.
Siphonia kaeregi - Photograph of a nice specimen of this tulip-shaped sponge.