verified source for familyAbdelhamid, M. A.; Abdelghany, M. S. (2015). Notatudiadema and Aegyptiaris: Two new regular echinoids genera with two new species from the Cenomanian of north Sinai, Egypt. <em>Cretaceous Research.</em> 55: 129-140., available online athttps://doi.org/10.1016/j.cretres.2015.01.003[details]