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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 “aster” (meaning star), with reference to the shape of these organisms. ==List of species==
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 Clypeaster amplificatus Koehler 1922.jpg|Clypeaster amplificatus Clypeaster australasiae.tif|Clypeaster australasiae Clypeaster chesheri (USNM E32948) 00.jpeg|Clypeaster chesheri Clypeaster cyclopilus (USNM 1198549).jpeg|Clypeaster cyclopilus Clypeaster euclastus (USNM 1151420) 002.jpeg|Clypeaster euclastus Clypeaster europacificus (USNM 34226) 002.jpeg|Clypeaster europacificus Clypeaster eurychorius - ECH-000149 hab-dor.tif|Clypeaster eurychorius Clypeaster fervens hiradicus - ECH-000142 hab-dor.tif|Clypeaster fervens Clypeaster humilis.JPG|Un Clypeaster humilis rejeté sur une plage aux Maldives. Clypeaster isolatus (USNM E11361) 001.jpeg|Clypeaster isolatus Clypeaster japonicus-Musée zoologique de Strasbourg-2025.jpg|Clypeaster japonicus avec ses radioles. Clypeaster kieri (USNM E18188) 001.jpeg|Clypeaster kieri Clypeaster latissimus.jpg|Clypeaster latissimus Clypeaster leptostracon (USNM 34259) 002.jpeg|Clypeaster leptostracon Clypeaster luetkeni - ECH-000200 hab-dor.tif|Clypeaster luetkeni Clypeaster lytopetalus (USNM 34207) 002.jpeg|Clypeaster lytopetalus EVType 6779 Clypeaster nummus 6.jpg|Clypeaster nummus Clypeaster pateriformes (USNM E7148) 003.jpeg|Clypeaster pateriformes Clypeaster prostratus (USNM E32920) 002.jpeg|Clypeaster prostratus Clypeaster rarispinus.jpg|Clypeaster rarispinus (MNHN) Clypeaster raveneli (USNM E41072) 002.jpeg|Clypeaster raveneli Clypeaster reticulatus test upperside.JPG|Clypeaster reticulatus Clypeaster rosaceus (San Salvador Island, Bahamas) 3.jpg|Test de Clypeaster rosaceus aux Bahamas. Clypeaster riisei - ECH-000292 hab-dor.tif|Clypeaster rotundus Clypeaster speciosus - ECH-000307 hab-dor 2.tif|Clypeaster speciosus Clypeaster subdepressus MN 01.jpg|Clypeaster subdepressus Clypeaster telurus (Clark, 1914) Plate XXIII.jpg|Clypeaster telurus ==Gallery==
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 (1904). Image:Clypeaster japonicus - Osaka Museum of Natural History - DSC07832.JPG|Clypeaster japonicus. ==References==
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