| Scutellidae Temporal range: [1] | |
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| Fossils of Scutella paulensis from France, on display at Galerie de paléontologie et d'anatomie comparée in Paris | |
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| Family: | Scutellidae Gray, 1825 [2] |
Scutellidae is a family of sand dollars (flat sea urchins) in the superfamily Scutellidea. All genera except Scaphechinus are extinct.
As of 2017 [update] , the World Register of Marine Species recognizes the following seven genera in this family: [3]
Sand dollars are species of flat, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are known as sea biscuits. Sand dollars can also be called "sand cakes" or "cake urchins".
Diadema is a genus of sea urchins of the family Diadematidae.
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.
The heart urchins or Spatangoida are an order of sea urchins.
The Atelostomata are a type of sea urchins. They are distinguished from other sea urchins by their irregular shape and the absence of a feeding lantern. The group includes the well known heart urchins, as well as some less familiar and extinct forms.
Cidaroida, also known as pencil urchins, is an order of primitive sea urchins, the only living order of the subclass Perischoechinoidea. All other orders of this subclass, which were even more primitive than the living forms, became extinct during the Mesozoic.
Echinarachnius is a genus of sand dollars, belonging to the family Echinarachniidae.
Spatangus is a genus of heart urchins in the Spatangidae family. The genus is synonymous with the previously recognised genera Prospatangus Lambert, 1902 and Spatagus. There are nine recognised species. The type species is Spatangus purpureus Müller, 1776 by subsequent designation.
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.
Holasteroida is an order of irregular sea urchins.
Echinometra is a genus of sea urchins in the family Echinometridae.
Arbacia stellata is a species of sea urchin of the family Arbaciidae. Their armour is covered with spines. It is placed in the genus Arbacia and lives in the sea. Arbacia stellata was first scientifically described in 1825 by Blainville.
Brissopsis lyrifera is a species of sea urchins of the family Brissidae. Their armour is covered with spines. It was first described by the British naturalist Edward Forbes in 1841. This species of sea urchin is a nonselective, infaunal deposit feeder.
Diadema savignyi is a species of long-spined sea urchin belonging to the family Diadematidae. Common names include long-spined sea urchin, black longspine urchin and the banded diadem. It is native to the east coast of Africa, the Red Sea, the Indian Ocean and western Pacific Ocean. It was first described in 1829 by the French naturalist Jean Victoire Audouin. The specific epithet honours the French zoologist Marie Jules César Savigny who described many new marine species from the Mediterranean Sea and Red Sea. The type locality is Mauritius.
Scutella is an extinct genus of sand dollars in the family Scutellidae.
The Neognathostomata are a superorder of sea urchins.
Clypeaster subdepressus is a species of sea urchin in the family Clypeasteridae. This species was first scientifically described in 1825 by the British zoologist John Edward Gray. It is a very large and flattened sea biscuit, native to the east coasts of North, Central and South America.
Mellitidae is a family of sand dollars, in the echinoderm order Clypeasteroida. These irregular sea urchins bury themselves in soft sediment in shallow seas.
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.
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