The Diadematidae are a family of sea urchins. Their tests are either rigid or flexible and their spines are long and hollow.
Arachnoides is a genus of sea urchin within the family Clypeasteridae, found in the Indo-Pacific oceans. The base is flat and the upper surface is convex.
Cerion is a genus of small to medium-sized tropical air-breathing land snails, terrestrial pulmonate gastropods in the family Cerionidae, sometimes known as the peanut snails. The genus is endemic to the Caribbean region.
Conulus is an extinct genus of echinoids that lived in the Cretaceous. Remains of Conulus species have been found in Asia, Europe, and North America.
Clypeaster, common name "cake urchins" or "sea biscuits", is a genus of echinoderms belonging to the family Clypeasteridae.
Conoclypus - from the Greek words Konos + clypus - is a genus of sea urchins belonging to the family Conoclypeidae.
Hemipneustes is an extinct genus of sea urchins belonging to the family Holasteridae.
Schizaster is a genus of heart urchins belonging to the family Schizasteridae. The type species of the genus is Schizaster studeri.
Amblypneustes is a genus of sea urchins, belonging to the family Temnopleuridae.
Parechinus angulosus, the Cape urchin, is a sea urchin in the family Parechinidae endemic to southern Africa. It is the only species in the genus Parechinus.
Schizasteridae is a family of echinoderms belonging to the order Spatangoida.
Brissus is a genus of echinoderms belonging to the family Brissidae.
Echinoneidae is a family of echinoderms belonging to the order Echinoneoida.
Echinocyamus is a genus of echinoderms belonging to the family Fibulariidae.
Cassidulus is a genus of echinoderms belonging to the family Cassidulidae.
Metalia is a genus of echinoderms belonging to the family Brissidae.
Echinolampas is a genus of echinoderms belonging to the family Echinolampadidae.
Echinodiscus is the scientific name of several genera of organisms and may refer to:
Echinodiscus is a genus of sand dollars within the family Astriclypeidae. There are currently 14 species assigned to the genus, with a majority being extinct.
