Clypeasteridae is a family of

sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) of ...

s in the

order Order, ORDER or Orders may refer to: * Categorization, the process in which ideas and objects are recognized, differentiated, and understood * Heterarchy, a system of organization wherein the elements have the potential to be ranked a number of d ...

Clypeasteroida Sand dollars (also known as a sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) are species of flat, burrowing sea urchins belonging to the order Clypeasteroida. Some species within the order, not quite as flat, are k ...

. This family was first

scientifically described A species description is a formal description of a newly discovered species, usually in the form of a scientific paper. Its purpose is to give a clear description of a new species of organism and explain how it differs from species that have be ...

in 1835 by the Swiss-American biologist

Louis Agassiz Jean Louis Rodolphe Agassiz ( ; ) FRS (For) FRSE (May 28, 1807 – December 14, 1873) was a Swiss-born American biologist and geologist who is recognized as a scholar of Earth's natural history. Spending his early life in Switzerland, he rec ...

Genera

The

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific specialist ...

list the following genera as being in this family:- *'' Ammotrophus'' H.L. Clark, 1928 *''

Arachnoides ''Arachnoides'' is a genus of sea urchin within the family (biology), family Clypeasteridae, found in the Indo-Pacific oceans. The base is flat and the upper surface is convex. If you are looking for a ''fern'' genus, its name is Arachniodes. S ...

'' Leske, 1778 *''

Clypeaster ''Clypeaster'', common name "cake urchins" or "sea biscuits", is a genus of echinoderms belonging to the family Clypeasteridae. Etymology The genus name ''Clypeaster'' is derived from the Latin “clypeus” (meaning ''round shield'') and “a ...

'' Lamarck, 1801 *'' Fellaster'' Durham, 1955 *'' Monostychia'' Laube, 1869

References

Clypeasteroida Echinoderm families {{echinoidea-stub