Traits Taxon list
Aarchaeocidaris Webster, 1997 † accepted as Palaechinus McCoy, 1844 †
Aarchaeocidaris strawberryensis Webster, 1997 †
Abatus Troschel, 1851
Abatus (Pseudabatus) Koehler, 1911
Abatus (Pseudabatus) nimrodi (Koehler, 1911)
Abatus agassizii Mortensen, 1910
Abatus beatriceae (Larrain, 1986)
Abatus cavernosus (Philippi, 1845)
Abatus cavernosus bidens Mortensen, 1910
Abatus cavernosus cavernosus (Philippi, 1845)
Abatus cordatus (Verrill, 1876)
Abatus curvidens Mortensen, 1936
Abatus elongatus (Koehler, 1908) accepted as Abatus koehleri (Thiéry, 1909)
Abatus ingens Koehler, 1926
Abatus kieri McKinney, McNamara & Wiedman, 1988 †
Abatus koehleri (Thiéry, 1909)
Abatus nimrodi (Koehler, 1911) accepted as Pseudabatus nimrodi Koehler, 1911 accepted as Abatus (Pseudabatus) nimrodi (Koehler, 1911)
Abatus philippii Lovén, 1871
Abatus shackletoni Koehler, 1911
Abelleicidaris Vadet, 1991 † accepted as Plegiocidaris Pomel, 1883 †
Abelleicidaris borjnadorensis Vadet, Marignac, Nicolleau & Reboul, 2007 †
Abertella Durham, 1953 †
Abertella aberti (Conrad, 1842) †
Abertella cazonesensis (Kew in Dickerson & Kew, 1917) †
Abertella complanata Brito, 1981 † accepted as Placatenella complanata (Brito, 1981) †
Abertella dengleri Osborne & Ciampaglio, 2010 †
Abertella floridana (Cooke, 1942) † accepted as Abertella aberti (Conrad, 1842) †
Abertella gualichensis Martínez, Reichler & Mooi, 2005 †
Abertella habanensis (Sanchez Roig, 1949) †
Abertella kewi Durham, 1957 †
Abertella miskellyi Kroh, Mooi, del Rió & Neumann, 2013 †
Abertella palmeri Durham, 1957 †
Abertella pirabensis (Marchesini Santos, 1958) †
Abertellidae Durham, 1955 †
Absurdaster Kroh, Lukeneder & Gallemí, 2014 †
Absurdaster hungaricus Kroh, Lukeneder & Gallemí, 2014 †
Absurdaster meriani (Ooster, 1865) †
Absurdaster puezensis Kroh, Lukeneder & Gallemí, 2014 †
Abyssocucumis Heding, 1942
Abyssocucumis abyssorum (Théel, 1886)
Abyssocucumis albatrossi (Cherbonnier, 1941)
Acanthechinus Duncan & Sladen, 1882 †
Acanthechinus dixiei (Cooke, 1941) †
Acanthocidaris Mortensen, 1903
Acanthocidaris curvatispinis (Bell, 1892)
Acanthocidaris hastigera A. Agassiz & H.L. Clark, 1907
Acanthocidaris maculicollis (de Meijere, 1904)
Acanthotrapeza Rowe, 1969 represented as Holothuria (Acanthotrapeza) Rowe, 1969
Acanthotrochus Danielssen & Koren, 1881
Acanthotrochus antarcticus Belyaev & Mironov, 1981
Acanthotrochus mirabilis Danielssen & Koren, 1881
Acanthotrochus multispinus Belyaev & Mironov, 1981
Acaudina H.L. Clark, 1908
Acaudina bacilla Cherbonnier & Féral, 1981
Acaudina demissa (Sluiter, 1901)
Acaudina leucoprocta (H.L. Clark, 1938)
Acaudina molpadioides (Semper, 1867)
Acaudina pellucida (Semper, 1867)
Acaudina punctata (Sluiter, 1887)
Acaudina rosettis O'Loughlin & Ong, 2015
Acaudina spinifera Teoh & Woo, 2022
Acaudina suspecta Cherbonnier & Féral, 1981
Aceste Thomson, 1877
Aceste bellidifera Thomson, 1877
Aceste ovata A. Agassiz & H.L. Clark, 1907
Aceste weberi Koehler, 1914
Achiridota H.L. Clark, 1908
Achiridota inermis (Fisher, 1907)
Achiridota profunda Heding, 1935
Achiridota smirnovi O'Loughlin & VandenSpiegel, 2010
Achlyonice Théel, 1879
Achlyonice ecalcarea Théel, 1879
Achlyonice gilpinbrowni (Pawson, 1965)
Achlyonice longicornis Bohn, 2006
Achlyonice margitae Gebruk, 1997
Achlyonice monactinica Ohshima, 1915
Achlyonice myriamae Gebruk, 1997
Achlyonice tui (Pawson, 1965)
Acriaster Smith in Smith & Bengtson, 1991 †
Acriaster sergipensis Smith in Smith & Benggtson, 1991 †
Acrocidaris L. Agassiz, 1840 †
Acrocidaris arginensis Weber, 1934 †
Acrocidaris borissiaki Weber, 1934 †
Acrocidaris cazioti Lambert, 1926 †
Acrocidaris crenulata Mercier, 1935 †
Acrocidaris marocense Vadet, Marignac, Nicolleau & Reboul, 2007 †
Acrocidaris nicolleaui Vadet & Nicolleau, 2000 †
Acroechinoidea (unaccepted )
Acrolusia Lambert, 1920 †
Acrolusiidae Mintz, 1968 †
Acropeltidae Lambert & Thiéry, 1914 †
Acropeltis L. Agassiz, 1838 †
Acropeltis atlantica Rey, Taj-Eddine & Witam, 1989 †
Acrosalenia L. Agassiz, 1840 †
Acrosalenia (Acrosalenia) L. Agassiz, 1840 †
Acrosalenia (Milnia) Haime, 1849 †
Acrosalenia arabica Kier, 1972a †
Acrosalenia basseae Lambert, 1936 †
Acrosalenia bowersi Kier, 1972a †
Acrosalenia dhrumaensis Kier, 1972a †