- S. studeri Agassiz, 1836; Upper Eocene (Priabonian), southern Europe (the type is from Verona, Italy).
- S. exoletus (Hutton 1873); Upper Eocene to Upper Oligocene, New Zealand.
- S. rotundatus (Doderlein, 1917); Recent, Galapagos Islands.
- S. gibberulus (Agassiz, 1847); Recent, Red Sea and Indian Ocean.
- S. compactus (Koehler, 1914); Recent, Indian Ocean.
- S. santamariai (Gauthier, in Fourtau, 1900); Lower Eocene, Egypt.
- S. zitteli (de Loriol, 1880); Lower Eocene, Egypt.
- S. delorenzoi (Checchia-Rispoli, 1950); Middle Eocene, Somalia, Qatar.
- S. ambulacrum (Deshayes, 1831); Lower Oligocene (Stampian), France.
- S. eurynotus Sismonda, 1842; Miocene, circum Mediterranean.
- S. fosteri McNamara & Philip, 1980; Miocene, Australia
- S. carinatus McNamara & Philip, 1980; Palaeocene-Eocene, Australia
- S. tatei McNamara & Philip, 1980; late Eocene, Australia
- S. abductus Tate, 1891; Miocene, Australia
- S. halli McNamara & Philip, 1980; Miocene, Tasmania
- S. sphenoides Hall, 1907; Miocene, Australia
- plus many more...
The number of genital pores in the type species, S. studeri, is not preserved in the holotype and was assumed by Mortensen (1951, p. 296) to be two in number based on a statement by Lambert. A well preserved specimen from the type locality, BMNH E2539 (illustrated above) shows four gonopores, with the anterior pair less well developed than the posterior pair. Mortensen (1951) maintained Schizaster and Paraster as discrete genera, on the mistaken belief that the type species of Schizaster had but two gonopores. It is now clear that there are no differences of any substance between Schizaster studeri Agassiz and Paraster gibberulus (Agassiz), so the two are here synonymized. The same apical disc structure is also seen in the type species of Aplospatangus, Schizaster eurynotus, which also falls into synonymy.
Schizasterids with well-developed latero-anal portion of the marginal fasicole and with two gonopores only are here treated as members of the genus Ova.