| Strongylocentrotus intermedius | |
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| Species: | S. intermedius |
| Binomial name | |
| Strongylocentrotus intermedius (A Agassiz, 1864) | |
Strongylocentrotus intermedius is a species of sea urchin described by Alexander Agassiz in 1864. [1]
Coelopleurus is an extant genus of echinoids with fossil records dating back to the Eocene, with remains found in Europe and North America.
The Strongylocentrotidae are a family of sea urchins in the order Echinoida.
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.
Acanthocidaris hastingeria is a species of sea urchin of the family Cidaridae. Their armour is covered with spines. It came from the genus Acanthocidaris and lives in the sea. Acanthocidaris hastingeria was first scientifically described in 1907 by Alexander Emanuel Agassiz & Hubert Lyman Clark.
Aporocidaris fragilis is a species of sea urchin of the family Ctenocidaridae. It is well-armoured with spines. It is placed in the genus Aporocidaris and lives in the sea. Aporocidaris fragilis was first scientifically described in 1907 by Alexander Emanuel Agassiz & Hubert Lyman Clark.
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 tessellatum 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 tessellatum was first scientifically described in 1879 by Alexander Emanuel Agassiz.
Echinometra is a genus of sea urchins in the family Echinometridae.
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.
Centrocidaris is a monotypic genus of sea urchins belonging to the family Cidaridae. The only species is Centrocidaris doederleini. Their armour is covered with spines. Centrocidaris doederleini was first scientifically described in 1898 by Alexander Agassiz.
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.
Cidaris abyssicola is a species of sea urchin in the Family Cidaridae. Cidaris abyssicola was first scientifically described in 1869 by Alexander Emanuel Agassiz.
Scutellidae is a family of fossil sand dollars in the superfamily Scutellidea. All genera except Scaphechinus are extinct.
Strongylocentrotus fragilis is a species of sea urchin of the family Strongylocentrotidae.
Chondrocidaris is a genus of sea urchins of the family Cidaridae described in 1863 by Alexander Agassiz. There are two living species and several fossil species dating as far back as the Miocene.
Araeosoma is a genus of deep-sea sea urchins in the family Echinothuriidae.
Tetragramma is a genus of fossil sea urchins known from the Upper Jurassic (Oxfordian) to the Upper Cretaceous (Turonian).
Pseudocentrotus depressus, commonly known as the pink sea urchin, is a species of sea urchin, one of only two species in the genus Pseudocentrotus. It was first described in 1864 by the American marine zoologist Alexander Agassiz as Toxocidaris depressus, having been collected during the North Pacific Exploring and Surveying Expedition undertaken by Captain Cadwalader Ringgold and later Captain John Rodgers.