• Acanthaulax acanthosphaera (Sarjeant) Sarjeant †
• Acanthaulax aceras (Eisenack) Stover & Evitt †
• Acanthaulax aculeata (Klement) Stover & Evitt †
• Acanthaulax angulosa (Gitmez) Stover & Evitt †
• Acanthaulax paliuros (Sarjeant) Sarjeant †
• Acanthaulax senta Drugg, 1978 †
• Acanthaulax spinosissima (Deflandre) Sarjeant †
• Acanthaulax venusta (Klement, 1960) Sarjeant †
• Acanthodinium caryophyllum Kofoid
• Acanthodinium spinosum Kofoid, 1907
• Acanthogonyaulax paliuros (Sargeant) Sargeant
• Acanthogonyaulax spinifera (Murray & Whitting) H.W. Graham, 1942
• Acanthogonyaulax venusta (Klement) Sarjeant
• Achilleodinium biformoides (Eisenack, 1958) Eaton, 1976 †
• Achomosphaera alcicornu (Eisenack, 1954) Davey & Williams †
• Achomosphaera andalousiensis Jan du Chêne, 1977 †
• Achomosphaera antleriformis P. Schiøler, 1993 †
• Achomosphaera argesensis E. Demetrescu, 1989 †
• Achomosphaera bulla Cookson & Eisenack †
• Achomosphaera crassipellis (Deflandre & Cookson) Stover & Evitt †
• Achomosphaera gralliforme (Brosius) Davey & Williams †
• Achomosphaera heterostylis (Heisecke) Stover & Evitt †
• Achomosphaera hirundo (Eisenack) Davey & Williams †
• Achomosphaera hyperacantha (Deflandre & Cookson) Davey & Williams †
• Achomosphaera linifera (Cookson & Eisenack) Stover & Evil †
• Achomosphaera membraniphora (Agelopoulos) Eaton †
• Achomosphaera neptuni (Eisenack, 1958) Davey & Williams, 1966 †
• Achomosphaera ramulifera (G.V. Deflandre, 1937) W.R. Evitt, 1963 †
• Achomosphaera recurvata K.P. Jain, S.C.D. Sah & R.Y. Singh, 1975 †
• Achomosphaera regiensis Corradini, 1972 †
• Achomosphaera reticulata Clarke & Verdier †
• Achomosphaera sagena Davey & Williams †
• Achomosphaera septata (Cookson & Eisenack) Stover & Evitt †
• Achomosphaera triangulata (Gerlach) Davey & Williams †
• Actinotheca aphroditae Cookson & Eisenack, 1960 †
• Actinotheca ornata Cookson & Eisenack, 1970 †
• Actinotheca rara Corradini, 1972 †
• Aiora fenestrata (Deflandre & Cookson) Cookson & Eisenack †
• Aiora perforare R.J. Davey
• Aireiana verrucosa Cookson & Eisenack, 1965 †
• Alaskadinium wigginsii Duxbury, 1977 †
• Aldorfia aldorfensis (Gocht, 1970) Stover & Evitt †
• Aldorfia deflandrei (Clarke & Verdier, 1967) Stover & Evitt †
• Aldorfia dictyophora (Deflandre) Stover & Evitt
• Aldorfia dictyota (Cookson & Eisenack) R.J. Davey
• Aldorfia spongiosa (D.J. McIntyre & W.W. Brideaux) R.J. Davey †
• Alexandrium acatenella (Whedon & Kofoid) Balech, 1985
• Alexandrium affine (H. Inoue & Y. Fukuyo) Balech, 1995
• Alexandrium andersoni Balech, 1990
• Alexandrium andersonii Balech, 1990
• Alexandrium angustitabulatum F.J.R. Taylor, 1995
• Alexandrium balechii (Steidinger) F.J.R. Taylor, 1979
• Alexandrium camurascutulum MacKenzie & Todd, 2002
• Alexandrium catenella (Whedon & Kofoid) Balech, 1985
• Alexandrium cohorticula (Balech) Balech, 1985
• Alexandrium compressum (Y. Fukuyo, K. Yoshida & H. Inoue) Balech, 1995
• Alexandrium concavum (K.R. Gaarder) E. Balech, 1985
• Alexandrium depressum (Gaarder) Balech & Tangen, 1985
• Alexandrium excavatum (Braarud) Balech & Tangen, 1985 accepted as Alexandrium tamarense (Lebour) E. Balech, 1995
• Alexandrium foedum Balech, 1990
• Alexandrium fraterculus (Balech) Balech, 1985
• Alexandrium fukuyoi E. Balech, 1985 accepted as Alexandrium affine (H. Inoue & Y. Fukuyo) Balech, 1995
• Alexandrium fundyense Balech, 1985
• Alexandrium gaarderae Nguyen-Ngoc & Larsen, 2004
• Alexandrium globosum Nguyen-Ngoc & Larsen, 2004
• Alexandrium hiranoi Kita & Fukuyo, 1988
• Alexandrium ibericum E. Balech, 1985 accepted as Alexandrium minutum Halim, 1960
• Alexandrium insuetum E. Balech, 1985
• Alexandrium kutnerae (E. Balech) E. Balech, 1985
• Alexandrium leei E. Balech, 1985
• Alexandrium lusitanicum E. Balech, 1985
• Alexandrium margalefi E. Balech, 1994
• Alexandrium margalefii E. Balech, 1994
• Alexandrium minutum Halim, 1960
• Alexandrium monilatum (J.F. Howell) Balech, 1995
• Alexandrium ostenfeldii (Paulsen) Balech & Tangen, 1985
• Alexandrium peruvianum (Balech & Mendiola) Balech & Tangen, 1985
• Alexandrium pseudogoniaulax (Biecheler, 1952) Horiguchi, 1983 ex Kita & Fukuyo, 1992 accepted as Alexandrium pseudogonyaulax (Biecheler) Horiguchi ex Kita & Fukuyo, 1992
• Alexandrium pseudogonyaulax (Biecheler) Horiguchi ex Kita & Fukuyo, 1992
• Alexandrium satoanum K. Yuki & Y. Fukuyo, 1992
• Alexandrium tamarense (Lebour) E. Balech, 1995
• Alexandrium tamiyavanichii Balech, 1994
• Alexandrium tamutum M. Montresor, A. Beran & U. John, 2004
• Alexandrium taylori Balech, 1994
• Alexandrium taylorii Balech, 1994
• Alexandrium tropicale E. Balech, 1985
• Alisocysta circumtabulata (Drugg) Stover & Evitt †
• Alisocysta margarita (Harland, 1979) Lentin & Williams †
• Alisocysta ornata (Cookson & Eisenack) Stover & Evitt †
• Amiculosphaera umbracula R. Harland, 1979 †
• Amphiceratium fusus (Ehrenberg) Vanhoeffen, 1896
• Amphidoma acuminata Stein, 1883
• Amphidoma biconica Kofoid, 1907 accepted as Oxytoxum biconicum (Kofoid) Dodge & Saunders, 1984
• Amphidoma caudata Halldal, 1953
• Amphidoma curtata Kofoid & Swezy, 1911
• Amphidoma depressa Kofoid & Swezy, 1911
• Amphidoma elongata Kofoid & Swezy, 1911
• Amphidoma laticincta Kofoid & Swezy, 1911
• Amphidoma nucula Stein, 1883
• Amphidoma obtusa Kofoid & Swezy, 1911