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.
The Camarodonta are an order of globular sea urchins in the class Echinoidea. The fossil record shows that camarodonts have been in existence since the Lower Cretaceous.
Aeropsis fulva is a species of sea urchin of the family Aeropsidae. Their armour is covered with spines. It is placed in the genus Aeropsis and lives in the sea. Aeropsis fulva was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Aporocidaris milleri is a species of sea urchin of the family Ctenocidaridae. Their armour is covered with spines. It is placed in the genus Aporocidaris and lives in the sea. Aporocidaris milleri was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Araeosoma coriacea is a species of sea urchin of the family Echinothuriidae. Their armour is covered with spines. It is placed in the genus Araeosoma and lives in the sea. Araeosoma coriacea was first scientifically described in 1879 by Alexander Emanuel Agassiz, an American scientist.
Echinometra is a genus of sea urchins in the family Echinometridae.
Brisaster latifrons is a species of sea urchins of the family Schizasteridae. Their armour is covered with spines. Brisaster latifrons was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Brisaster townsendi is a species of sea urchins of the Family Schizasteridae. Their armour is covered with spines. Brisaster townsendi was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Brissopsis columbaris is a species of sea urchins of the Family Brissidae. Their armour is covered with spines. Brissopsis columbaris was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Brissopsis pacifica is a species of sea urchins of the Family Brissidae. Their armour is covered with spines. Brissopsis pacifica was first scientifically described in 1898 by Alexander Emanuel Agassiz.
Calymne relicta is a species of sea urchins of the Family Calymnidae. Their armour is covered with spines. Calymne relicta was first scientifically described in 1877 by Thomson.
Cassidulus caribaearum is a species of sea urchins of the Family Cassidulidae. Their armour is covered with spines. Cassidulus caribaearum was first scientifically described in 1801 by Jean-Baptiste de Lamarck.
Cassidulus delectus is a species of sea urchins of the Family Cassidulidae. Their armour is covered with spines. Cassidulus delectus was first scientifically described in 1960 by Krau.
Cassidulus infidus is a species of sea urchins of the Family Cassidulidae. Their armour is covered with spines. Cassidulus infidus was first scientifically described in 1948 by Ole Theodor Jensen Mortensen.
Cassidulus mitis is a species of sea urchins of the Family Cassidulidae. Their armour is covered with spines. Cassidulus mitis was first scientifically described in 1954 by Krau.
Centrostephanus asteriscus is a species of sea urchins of the Family Diadematidae. Their armour is covered with spines. Centrostephanus asteriscus was first scientifically described in 1907 by Alexander Emanuel Agassiz & Hubert Lyman Clark.
Centrostephanus besnardi is a species of sea urchins of the Family Diadematidae. Their armour is covered with spines. Centrostephanus besnardi was first scientifically described in 1955 by Bernasconi.
Ceratophysa ceratopyga is a species of sea urchins of the Family Pourtalesiidae. Their armour is covered with spines. Ceratophysa ceratopyga was first scientifically described in 1879 by Alexander Emanuel Agassiz.
Chaetodiadema pallidum is a species of sea urchins of the Family Diadematidae. Their armour is covered with spines. Chaetodiadema pallidum was first scientifically described in 1907 by Alexander Emanuel Agassiz and Hubert Lyman Clark.
Aporocidaris is a genus of sea urchins in the family Ctenocidaridae. Several species are found in deep water in circum-Antarctic locations.
