• Acanthophora aokii Okamura, 1934: non-calcified
• Acanthophora dendroides Harvey, 1855: non-calcified
• Acanthophora muscoides (Linnaeus) Bory de Saint-Vincent, 1828: non-calcified
• Acanthophora nayadiformis (Delile) Papenfuss, 1968: non-calcified
• Acanthophora pacifica (Setchell) Kraft, 1979: non-calcified
• Acanthophora ramulosa Lindenberg ex Kützing, 1843: non-calcified
• Acanthophora spicifera (M.Vahl) Børgesen, 1910: non-calcified
• Acinetospora asiatica Yaegashi, Yamagishi & Kogame, 2015: non-calcified
• Acinetospora crinita (Carmichael) Sauvageau, 1899: non-calcified
• Acinetospora filamentosa (Noda) Yaegashi, Uwai & Kogame, 2015: non-calcified
• Acinetospora nicholsoniae Hollenberg, 1971: non-calcified
• Acrochaetium actinocladum I.A.Abbott, 1962: non-calcified
• Acrochaetium affine M.A.Howe & Hoyt, 1916: non-calcified
• Acrochaetium agardhiellae A.B.Joly & Cordeiro, 1963: non-calcified
• Acrochaetium alariae (Jónsson) Bornet, 1904: non-calcified
• Acrochaetium alcyonidiae C.C.Jao: non-calcified
• Acrochaetium angustum (K.M.Drew) Papenfuss, 1945: non-calcified
• Acrochaetium antillarum W.R.Taylor, 1942: non-calcified
• Acrochaetium arcuatum (K.M.Drew) C.K.Tseng, 1945: non-calcified
• Acrochaetium armoricanum Feldmann, 1954: non-calcified
• Acrochaetium armoricum Feldmann, 1954: non-calcified
• Acrochaetium arnoldii Weber-van Bosse, 1921: non-calcified
• Acrochaetium avrainvilleae Børgesen, 1915: non-calcified
• Acrochaetium bahreinii Børgesen, 1939: non-calcified
• Acrochaetium balliae (Stegenga) Stegenga, Bolton & R.J.Anderson, 1997: non-calcified
• Acrochaetium balticum (Rosenvinge) Aleem & Schulz, 1952: non-calcified
• Acrochaetium barbadense (Vickers) Børgesen, 1915: non-calcified
• Acrochaetium barbadensis (Vickers) Borgesen, 1915: non-calcified
• Acrochaetium battersianum Hamel, 1927: non-calcified
• Acrochaetium bengalicum A.K.Islam & A.Aziz, 1987: non-calcified
• Acrochaetium blomquistii Aziz, 1965: non-calcified
• Acrochaetium boergesenii Schiffner, 1931: non-calcified
• Acrochaetium brebneri (Batters) Hamel, 1928: non-calcified
• Acrochaetium bulbosa G.Hamel, 1927: non-calcified
• Acrochaetium bulbosum Hamel: non-calcified
• Acrochaetium byssaceum (Kützing) Nägeli, 1862: non-calcified
• Acrochaetium caesareae Feldmann, 1931: non-calcified
• Acrochaetium caespitiforme Børgesen, 1920: non-calcified
• Acrochaetium callopodum (Rosenvinge) Hamel: non-calcified
• Acrochaetium canariense Børgesen, 1927: non-calcified
• Acrochaetium candelabrum Børgesen, 1942: non-calcified
• Acrochaetium carneum J.Agardh: non-calcified
• Acrochaetium catenulatum M.Howe, 1914: non-calcified
• Acrochaetium chaetomorphae (Tanaka & P.H.Hô) Heerebout, 1968: non-calcified
• Acrochaetium champiae P.Anand, 1943: non-calcified
• Acrochaetium chondriae Aziz, 1965: non-calcified
• Acrochaetium cladestinum (Mont.) Howe: non-calcified
• Acrochaetium clandestinum (Montagne) M.Howe, 1914: non-calcified
• Acrochaetium colaconemoides P.H.Hô, 1969: non-calcified
• Acrochaetium collopodum (Rosenvinge) Hamel, 1927: non-calcified
• Acrochaetium concavum (F.Schmitz & Heydrich) Setchell & Gardner: non-calcified
• Acrochaetium crassipes (Børgesen) Børgesen, 1915: non-calcified
• Acrochaetium curtum Baardseth, 1941: non-calcified
• Acrochaetium cymopoliae Børgesen, 1927: non-calcified
• Acrochaetium cytophagum (Rosenvinge) Hamel, 1927: non-calcified
• Acrochaetium delisea Aziz, 1965: non-calcified
• Acrochaetium discoideum Børgesen, 1924: non-calcified
• Acrochaetium distichosporum E.Y.Dawson, Acleto & Foldvik, 1964: non-calcified
• Acrochaetium dotyi I.A.Abbott, 1962: non-calcified
• Acrochaetium doumerquei Hamel & Hamel-Joukov, 1931: non-calcified
• Acrochaetium drewii Baardseth: non-calcified
• Acrochaetium duboscqii Feldmann, 1935: non-calcified
• Acrochaetium dumontiae (Rosenvinge) Hamel, 1927: non-calcified
• Acrochaetium dwarkense Børgesen, 1932: non-calcified
• Acrochaetium eastwoodae (Setchell & N.L.Gardner) Papenfuss, 1945: non-calcified
• Acrochaetium effusum Levring, 1953: non-calcified
• Acrochaetium endozoicum (Darbishire) Batters, 1902: non-calcified
• Acrochaetium entophyticum Batters, 1902: non-calcified
• Acrochaetium epispiculum A.B.Joly & Cordeiro, 1963: non-calcified
• Acrochaetium epizooicum A.A.Aleem, 1980: non-calcified
• Acrochaetium erectum Børgesen, 1932: non-calcified
• Acrochaetium ernothrix Børgesen, 1915: non-calcified
• Acrochaetium extensum Ercegovic, 1957: non-calcified
• Acrochaetium fernandezianum (Levring) Papenfuss, 1947: non-calcified
• Acrochaetium flexuosum Vickers, 1905: non-calcified
• Acrochaetium fuegiense Kylin, 1919: non-calcified
• Acrochaetium galaxaurae Aziz, 1965: non-calcified
• Acrochaetium globosum Børgesen, 1915: non-calcified
• Acrochaetium grande (Levring) Papenfuss, 1947: non-calcified
• Acrochaetium grateloupiae E.Y.Dawson, 1950: non-calcified
• Acrochaetium hamelii Feldmann, 1931: non-calcified
• Acrochaetium hauckii Schiffner, 1916: non-calcified
• Acrochaetium hirsutum (K.M.Drew) P.W.Gabrielson, 2000: non-calcified
• Acrochaetium hlulekaense Stegenga, 1985: non-calcified
• Acrochaetium homorhizum Børgesen: non-calcified
• Acrochaetium hormorhizum Børgesen, 1915: non-calcified
• Acrochaetium howei (Yamada) Papenfuss, 1945: non-calcified
• Acrochaetium hoytii F.S.Collins, 1908: non-calcified
• Acrochaetium humile (Rosenvinge) Børgesen, 1915: non-calcified
• Acrochaetium hummii Aziz, 1965: non-calcified
• Acrochaetium imitator I.A.Abbott, 1962: non-calcified
• Acrochaetium immersum (Rosenvinge) Hamel, 1927: non-calcified
• Acrochaetium inclusum (Levring) Papenfuss, 1945: non-calcified
• Acrochaetium incrassatum Ercegovic, 1957: non-calcified
• Acrochaetium inkyui Y.-P.Lee, 1987: non-calcified
• Acrochaetium interpositum (Heydrich) Børgesen, 1915: non-calcified
• Acrochaetium irregulare (Reinsch): non-calcified
• Acrochaetium islamii Aziz, 1965: non-calcified
• Acrochaetium iyengarii Børgesen, 1933: non-calcified
• Acrochaetium jamaicense V.J.Chapman, 1963: non-calcified