†family Polycidaridae Vadet 1988 (pencil urchin)
Full reference: A. Vadet. 1988. Révision des principaux “Cidaris” de l’Oxfordien et du Kimméridgien inférieur Européens. Mémoires de la Société Académique du Boulonnais 4:1-148
Parent taxon: Cidaroida according to A. Kroh and A. B. Smith 2010
Sister taxa: Cidaridea, Delocidaris, Diplocidaridae, Dorocidaris, Fellius, Hirudocidaris, Histocidaridea, Leurocidaris, Menocidaris, Mesodiadema, Mikrocidari, Minicidaris, Miocidaridae, Nenoticidaridae, Oedematocidaris, Palmerius, Prophyllacanthus, Rhabdocidaridae, Serpianotiaridae, Tretocidaris, Triadotiaridae
Subtaxa: none
Ecology: slow-moving low-level epifaunal grazer-omnivore