Kingdom Animalia Class Echinoidea Order Cassiduloida | Phylum Echinodermata Subclass Euechinoidea Rank Genus | |
 | ||
Similar Fibularia, Pseudocidaris, Tylocidaris, Phymosoma, Heteraster | ||
Hardouinia is an extinct genus of echinoids that lived in the Late Cretaceous. Its remains have been found in North America.
References
Hardouinia Wikipedia(Text) CC BY-SA