Echinus is a genus of sea urchins.
Cassiduloida is an order of sea urchins. The group was extremely diverse with many families and species during the Mesozoic, but today, only seven extant species remain.
Cidaridae is a family of sea urchins in the order Cidaroida.
Henri Émile Sauvage was a French paleontologist, ichthyologist, and herpetologist. He was a leading expert on Mesozoic fish and reptiles.
Holasteroida is an order of irregular sea urchins.
Diplocidaris is an extinct genus of sea urchins belonging to the family Diplocidaridae. The type species of this genus is Cidaris gigantea Agassiz, 1840.
Glyphocyphidae is an extinct family of sea urchins in the class Echinoidea.
Prosostoma is an extinct genus of sea urchins belonging to the family Asterostomatidae.
Irregularia is an extant infraclass of sea urchins that first appeared in the Lower Jurassic.
The Neognathostomata are a superorder of sea urchins.
Asterocidaris is a genus of fossils sea urchins in the family Hemicidaridae. These epifaunal grazer-deposit feeders lived in the Middle and Upper Jurassic age.
Hemicidaridae is a family of extinct sea urchins characterized by large, massive, club-shaped spines.
Gustave Honoré Cotteau was a French judge, naturalist and paleontologist.
Hemipneustidae is an extinct family of sea urchins.
Victor-Auguste Gauthier was a French school teacher and amateur palaeontologist. He specialized in the study of fossilized sea urchins, contributing meticulous descriptions of many fossils found in southern France, Algeria, Tunisia and Persia.
Alphonse Péron was a French soldier and amateur naturalist. He used his spare time to pursue his interest in paleontology, and authored or coauthored several important works on the geology and paleontology of France and Algeria.
Clypeolampas is a genus of sea urchins belonging to the order Clypeasteroida.
Aeropsidae is a family of echinoderms belonging to the order Spatangoida. It contains one extant genus. There are also eight extinct genera, most of which fall in the subfamily Corasterinae.
Echinolampas is a genus of echinoderms belonging to the family Echinolampadidae.
Plagiobrissus is a genus of echinoderms belonging to the family Brissidae.
