Coelopleurus is an extant genus of echinoids with fossil records dating back to the Eocene, with remains found in Europe and North America.
Henricia is a large genus of slender-armed sea stars belonging to the family Echinasteridae. It contains about fifty species.
Lovenia is a genus of sea urchin that is the sister taxon to Breynia and Echinocardium.
Clypeaster, common name "cake urchins" or "sea biscuits", is a genus of echinoderms belonging to the family Clypeasteridae.
Aporocidaris is a genus of sea urchins in the family Ctenocidaridae. Several species are found in deep water in circum-Antarctic locations.
Histocidaris is a genus of sea urchins in the family Histocidaridae. Some species are known from the fossil record.
The pourtalesiids (Pourtalesiidae) are a family of irregular sea urchins that live in the deep sea. They are secondarily bilateral-symmetrical and like other representatives of the taxon Holasteroida they lack the lantern of Aristotle, which is typical for many other sea urchins. The genus Pourtalesia was named after Louis-François de Pourtalès who first collected these animals while dredging at a depth of 600 m. The family is known already from the Upper Cretaceous (Maastrichtian) and is distributed worldwide.
Aspidodiadema is a genus of echinoderms belonging to the family Aspidodiadematidae. The species of this genus are found in the Indo-Pacific and Caribbean.
Schizasteridae is a family of echinoderms belonging to the order Spatangoida.
Brissidae is a family of echinoderms belonging to the order Spatangoida.
Stylocidaris is a genus of echinoderms belonging to the family Cidaridae.
Euryalidae is a family of echinoderms belonging to the order Euryalida.
Eurypatagidae is a family of echinoderms belonging to the order Spatangoida.
Plexechinus is a genus of echinoderms belonging to the monotypic family Plexechinidae.
Brisaster is a genus of echinoderms belonging to the family Schizasteridae.
Amphipneustes is a genus of echinoderm belonging to the order Spatangoida.
Echinocyamus is a genus of echinoderms belonging to the family Fibulariidae.
Aceste is a genus of echinoderms belonging to the family Schizasteridae.
Ophidiaster is a genus of echinoderms belonging to the family Ophidiasteridae.
Stereocidaris is a genus of echinoderm belonging to the family Cidaridae.
