''Clypeaster'', common name "cake urchins" or "sea biscuits", is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nom ...

echinoderm An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the s ...

s belonging to the family

Clypeasteridae Clypeasteridae is a family of sea urchins in the order Clypeasteroida. This family was first scientifically described in 1835 by the Swiss-American biologist Louis Agassiz. Genera The World Register of Marine Species list the following genera a ...

Etymology

The genus name ''Clypeaster'' is derived from the Latin “clypeus” (meaning ''round shield'') and “aster” (meaning ''star''), with reference to the shape of these organisms.

List of species

* '' Clypeaster aloysioi'' (Brito, 1959) * '' Clypeaster amplificatus'' Koehler, 1922 * '' Clypeaster annandalei'' Koehler, 1922 * '' Clypeaster australasiae'' (Gray, 1851) * '' Clypeaster chesheri'' Serafy, 1970 * '' Clypeaster cyclopilus'' H.L. Clark, 1941 * '' Clypeaster durandi'' (Cherbonnier, 1959b) * '' Clypeaster elongatus'' H.L. Clark, 1948 * '' Clypeaster euclastus'' H.L. Clark, 1941 * '' Clypeaster europacificus'' H.L. Clark, 1914 * '' Clypeaster eurychorius'' H.L. Clark, 1924 * '' Clypeaster euryptealus'' H.L. Clark, 1925 * '' Clypeaster fervens'' Koehler, 1922 * '' Clypeaster humilis'' (Leske, 1778) * '' Clypeaster isolatus'' Serafy, 1971 * '' Clypeaster japonicus'' Döderlein, 1885 * '' Clypeaster kieri'' Pawson & Phelan, 1979 * '' Clypeaster lamprus'' H.L. Clark, 1914 * '' Clypeaster latissimus'' (Lamarck, 1816) * '' Clypeaster leptostracon'' A. Agassiz & H.L. Clark, 1907 * '' Clypeaster luetkeni'' Mortensen, 1948 * '' Clypeaster lytopetalus'' A. Agassiz & H.L. Clark, 1907 * '' Clypeaster microstomus'' Lambert, 1912 † * '' Clypeaster miniaceus'' H.L. Clark, 1925 * '' Clypeaster minihagali'' Deraniyagala, 1956 † * '' Clypeaster nummus'' Mortensen, 1948 * '' Clypeaster ochrus'' H.L. Clark, 1914 * '' Clypeaster ohshimensis'' Ikeda, 1935 * '' Clypeaster oliveirai'' Krau, 1952 * '' Clypeaster pallidus'' H.L. Clark, 1914 * '' Clypeaster pateriformis'' Mortensen, 1948 * '' Clypeaster prostratus'' (Ravenel, 1845) * '' Clypeaster rangianus'' Desmoulins, 1835 * '' Clypeaster rarispinus'' de Meijere, 1903 * '' Clypeaster ravenelii'' (A. Agassiz, 1869) * '' Clypeaster reticulatus'' (Linnaeus, 1758) * '' Clypeaster rosaceus'' (Linnaeus, 1758) * '' Clypeaster rotundus'' (A. Agassiz, 1863) * '' Clypeaster speciosus'' Verrill, 1870 * '' Clypeaster subdepressus'' (Gray, 1825) * '' Clypeaster telurus'' H.L. Clark, 1914 * '' Clypeaster tumidus'' (Tension-Woods, 1878) * '' Clypeaster virescens'' Döderlein, 1885

Gallery

File:Clypeaster reticulatus both sides.jpg, ''Clypeaster reticulatus'' File:Clypeasterbowersi.jpg, Fossil of ''Clypeaster bowersi'' the San Diego Natural History Museum, California File:Clypeasterinsignis.jpg, Fossil of ''Clypeaster insignis'' at the San Diego County Fair, California File:Clypeaster portentosus.jpg, Fossil of ''Clypeaster portentosus'' at the Museo Arqueológico Municipal de Cartagena Image :Clypeaster rosaceus (Linnaeus, 1758) derivate 2013.jpg, '' Clypeaster rosaceus'' (aboral and internal views), by Ernst Haeckel in ''

Kunstformen der Natur (known in English as ''Art Forms in Nature'') is a book of lithographic and halftone prints by German biologist Ernst Haeckel. ...

'' (1904). Image:Clypeaster japonicus - Osaka Museum of Natural History - DSC07832.JPG, '' Clypeaster japonicus''.

References

''Clypeaster'' Lamarck, 1801

National History Museum
*Sepkoski, Jac
Sepkoski's Online Genus Database

Paleobiology Database
Clypeasteridae Echinoidea genera Extant Eocene first appearances Taxa named by Jean-Baptiste Lamarck {{Echinoidea-stub