van Kempen 1977. Roepella solanensis, a new sponge from the mid-tertiary of S. E. Spain. First fossil record of a hymeniacidonid, with remarks on other fossilized sponges with monaxonid megascleres. 1. Proceedings K ned Akad Wet (Palaeont Geol Phys Chem), 80(2) 1977: 106-119,illust.