Schizaster

Schizaster is a genus of heart urchins belonging to the family Schizasteridae. The type species of the genus is Schizaster studeri.

Species
Extant and extinct species within this genus include:


 * Schizaster alcaldei Sánchez Roig, 1949 †
 * Schizaster alsiensis Maccagno, 1947 †
 * Schizaster altissimus Arnold & H. L. Clark, 1927 †
 * Schizaster bathypetalus Arnold & H. L. Clark, 1927 †
 * Schizaster beckeri Cooke, 1942 †
 * Schizaster brachypetalus Arnold & H. L. Clark, 1927 †
 * Schizaster caobaense Sánchez Roig, 1949 †
 * Schizaster cojimarensis Sánchez Roig, 1949 †
 * Schizaster compactus (Koehler, 1914)
 * Schizaster costaricensis Durham, 1961 †
 * Schizaster delorenzoi Checchia-Rispoli, 1950 †
 * Schizaster doederleini (Chesher, 1972)
 * Schizaster dumblei Israelsky, 1924 †
 * Schizaster duroensis Kier, 1957 †
 * Schizaster dyscritus Arnold & H. L. Clark, 1927 †
 * Schizaster edwardsi Cotteau, 1889 -
 * Schizaster eopneustes Lambert, 1933 †
 * Schizaster excavatus Martin, in Jeannet & Martin, 1937 †
 * Schizaster fernandezi Sánchez Roig, 1952 †
 * Schizaster floridiensis (Kier & Grant, 1965)
 * Schizaster gerthi Pijpers, 1933 †
 * Schizaster gibberulus L. Agassiz in L. Agassiz & Desor, 1847
 * Schizaster gigas Sánchez Roig, 1953 †
 * Schizaster granti Duncan & Sladen, 1883 †
 * Schizaster guirensis Sánchez Roig, 1949 †
 * Schizaster habanensis Sánchez Roig, 1949 †
 * Schizaster hexagonalis Arnold & H. L. Clark, 1927 †
 * Schizaster humei Lambert, 1932 †
 * Schizaster hunti Kier, 1957 †
 * Schizaster jeanneti Martin, in Jeannet & Martin, 1937 †
 * Schizaster karkarensis Kier, 1957 †
 * Schizaster kinasaensis Morishita, 1953 †
 * Schizaster lacunosus (Linnaeus, 1758)
 * Schizaster leprosorum Lambert, 1933 †
 * Schizaster llagunoi Lambert & Sánchez Roig, in Sánchez Roig, 1949 †
 * Schizaster marci Castex, 1930 †
 * Schizaster miyazakiensis Morishita, 1956 †
 * Schizaster morlini Grant & Hertlein, 1956 †
 * Schizaster moronensis Sánchez Roig, 1951 †
 * Schizaster munozi Sánchez Roig, 1949 †
 * Schizaster narindensis Lambert, 1933 †
 * Schizaster ocalanus Cooke, 1942 †
 * Schizaster orbignyanus A. Agassiz, 1880
 * Schizaster ovatus (Lindley, 2004)
 * Schizaster pappi Thirring, 1936 †
 * Schizaster pentagonalis Sánchez Roig, 1953 †
 * Schizaster persica Clegg, 1933 †
 * Schizaster portisi Serra, 1932 †
 * Schizaster pratti Israelsky, 1933 †
 * Schizaster riveroi Sánchez Roig, 1952 †
 * Schizaster rojasi Sánchez Roig, 1952 †
 * Schizaster rotundatus (Döderlein, 1906)
 * Schizaster salutis Sánchez Roig, 1949 †
 * Schizaster sanctamariae Sánchez Roig, 1949 †
 * Schizaster santanae Sánchez Roig, 1949 †
 * Schizaster schlosseri Traub, 1938 †
 * Schizaster taiwanicus Hayasaka, 1948 †
 * Schizaster vedadoensis Sánchez Roig, 1949 †

The fossil record of the genus dates back to the Paleocene (age range: 66.043 to 0.012 million years ago). These fossils have been found all over the world.