Kingdom Animalia Class Echinoidea Rank Family | Phylum Echinodermata Order Hemicidaroida | |
Similar Phymosomatidae, Saleniidae, Arbacioida, Echinacea | ||
Pseudodiadematidae are members of the phylum Echinodermata. Their fossil remains date to the Cretaceous period (144 - 66.4 MYA).
References
Pseudodiadematidae Wikipedia(Text) CC BY-SA