• Abakana macrospina (Schoenmann, 1926) †
• Abditoporella dimorpha Sosa-Yañez, Vieira & Solís-Marín, 2015
• Abditoporella turrita (Osburn, 1952)
• Abdomenopora schumacheri Voigt, 1995 †
• Aberrodomus candidus Gordon, 1988
• Aberrodomus pocillifer (Harmer, 1957)
• Aberrodomus sinuatus (Harmer, 1957)
• Abyssoecia elevata Grischenko, Gordon & Melnik, 2018
• Acamarchis bertholletii Audouin, 1826 accepted as Cradoscrupocellaria bertholletii (Audouin, 1826)
• Acamarchis brasiliensis d'Orbigny, 1841 (uncertain > nomen dubium)
• Acamarchis dentata Lamouroux, 1816 accepted as Virididentula dentata (Lamouroux, 1816)
• Acamarchis geoffroyi Audouin, 1826 accepted as Cradoscrupocellaria reptans (Linnaeus, 1758)
• Acamarchis jolloisii Audouin, 1826 accepted as Licornia jolloisii (Audouin, 1826)
• Acamarchis multiserialis d'Orbigny, 1841 accepted as Bugulina multiserialis (d'Orbigny, 1841)
• Acamarchis tridentatus Krauss, 1837 accepted as Bugula dentata (Lamouroux, 1816) accepted as Virididentula dentata (Lamouroux, 1816)
• Acanthionella angustidens (Levinsen, 1925) † accepted as Psilosecos angustidens (Levinsen, 1925) †
• Acanthionella oecioporosa Canu & Bassler, 1920 † accepted as Hoplocheilina oecioporosa (Canu & Bassler, 1920) †
• Acanthionella simplex Canu & Bassler, 1920 † accepted as Hoplocheilina simplex (Canu & Bassler, 1920) †
• Acanthionella typica (Gabb & Horn, 1860) † accepted as Hoplocheilina typica (Gabb & Horn, 1860) †
• Acanthobaktron spinosum Voigt, 1999 †
• Acanthocella clypeata Canu & Bassler, 1928 accepted as Corbulipora clypeata (Canu & Bassler, 1928)
• Acanthocella erinacea Canu & Bassler, 1917 † accepted as Castanopora (Castanoporina) erinacea (Canu & Bassler, 1917) †
• Acanthocella tubulifera (Hincks, 1881) accepted as Corbulipora tubulifera (Hincks, 1881)
• Acanthoceramoporella brestica Pushkin, 2002 †
• Acanthoceramoporella crassimuralis (Bassler, 1911) † accepted as Anolotichiina crassimuralis (Bassler, 1911) †
• Acanthoceramoporella granulosa (Ulrich, 1890) †
• Acanthoceramoporella granulosa minor (Bassler, 1911) †
• Acanthoceramoporella spinigera Ernst & Munnecke, 2009 †
• Acanthoceramoporella triloba (Cumings & Galloway, 1913) †
• Acanthoceramoporella valliensis Karklins, 1984 †
• Acanthocladia acuticosta Bassler, 1929 † accepted as Ramipora ambrosioides (Bretnall, 1926) †
• Acanthocladia anceps (Schlotheim, 1820) †
• Acanthocladia anceps laxa Korn, 1930 †
• Acanthocladia antiqua Nekhoroshev, 1956 †
• Acanthocladia biserialis Chronic, 1949 †
• Acanthocladia ciscoensis Moore, 1929 †
• Acanthocladia ciscoensis granulosa Moore, 1929 †
• Acanthocladia ciscoensis irregularis Moore, 1929 †
• Acanthocladia crebriramosa Trizna, 1939 †
• Acanthocladia fruticosa Ulrich, 1890 †
• Acanthocladia guadalupensis Girty, 1908 †
• Acanthocladia macer Trizna, 1950 †
• Acanthocladia minor Korn, 1930 †
• Acanthocladia morozovae Popeko, 1967 †
• Acanthocladia multipora Fritz, 1932 †
• Acanthocladia ouachitensis Harlton, 1933 †
• Acanthocladia pampinosa Trizna, 1950 †
• Acanthocladia peculiaris Sakagami, 1962 † accepted as Arborocladia peculiaris (Sakagami, 1962) †
• Acanthocladia pinnata Rogers, 1900 †
• Acanthocladia rectangulata Xia & Liu, 1986 †
• Acanthocladia rectifurcata Bassler, 1929 †
• Acanthocladia regularis Bassler, 1929 †
• Acanthocladia rhombicellata Shulga-Nesterenko, 1955 †
• Acanthocladia robusta Yang & Lu, 1962 †
• Acanthocladia simplex Moore, 1929 †
• Acanthocladia sparsifurcata Shulga-Nesterenko, 1941 †
• Acanthocladia sparsifurcata tenuis Nikiforova, 1938 †
• Acanthocladia striata Bolkhowitinova & Markoff, 1926 †
• Acanthocladia thaiensis Sakagami, 1968 †
• Acanthocladia tumulosa Morozova, 1970 †
• Acanthocladia tundrica Kruchinina, 1986 †
• Acanthoclema alternatum (Hall, 1883) †
• Acanthoclema asperum (Hall, 1852) †
• Acanthoclema confluens (Ulrich, 1888) †
• Acanthoclema distilum Bigey, 1988 †
• Acanthoclema divergens Hall & Simpson, 1887 †
• Acanthoclema elegantula Ernst, 2008 †
• Acanthoclema irregularis Ernst, 2011 †
• Acanthoclema junggarensis Xia, 1997 †
• Acanthoclema lineatum McNair, 1937 †
• Acanthoclema ohioense McNair, 1937 †
• Acanthoclema ovatum Hall & Simpson, 1887 †
• Acanthoclema parva Ernst, 2011 †
• Acanthoclema parvula Ernst, Dorsch & Keller, 2011 †
• Acanthoclema sulcatum Hall & Simpson, 1887 †
• Acanthoclema triangularis Ernst & Königshof, 2010 †
• Acanthoclema triseriale (Hall, 1883) †
• Acanthodesia ancestra Ducasse, 1958 † (uncertain > taxon inquirendum)
• Acanthodesia arborescens Canu & Bassler, 1928 accepted as Biflustra arborescens (Canu & Bassler, 1928)
• Acanthodesia arctata Harmer, 1926 accepted as Nelliella arctata Harmer, 1926
• Acanthodesia bifloris Wang & Tung, 1976 accepted as Membraniporopsis bifloris (Wang & Tung, 1976)
• Acanthodesia bifossata Brown, 1952 † accepted as Biflustra bifossata (Brown, 1952) †
• Acanthodesia bocki Silen, 1941 accepted as Quadricellaria bocki (Silén, 1941)
• Acanthodesia chainei Vigneaux, 1949 † accepted as Biflustra chainei (Vigneaux, 1949) †
• Acanthodesia commensalis (Kirkpatrick & Metzelaar, 1922) accepted as Conopeum commensale Kirkpatrick & Metzelaar, 1922
• Acanthodesia crenulata (Okada, 1923) accepted as Biflustra crenulata (Okada, 1923) accepted as Biflustra okadai Almeida, Souza & Vieira, 2017
• Acanthodesia falsitenuis (Liu, 1992) accepted as Biflustra falsitenuis (Liu, 1992)
• Acanthodesia grandicella Canu & Bassler, 1929 accepted as Biflustra grandicella (Canu & Bassler, 1929)
• Acanthodesia irregulata (Liu, 1991) accepted as Biflustra irregulata (Liu, 1991)
• Acanthodesia lamellosa Canu & Bassler, 1929 accepted as Biflustra lamellosa (Canu & Bassler, 1929)
• Acanthodesia limosa (Waters, 1909) accepted as Membranipora limosa Waters, 1909 accepted as Biflustra limosa (Waters, 1909)
• Acanthodesia nelliiformis Harmer, 1926 accepted as Nelliella nelliiformis (Harmer, 1926)
• Acanthodesia paulensis Marcus, 1937 accepted as Biflustra paulensis (Marcus, 1937)
• Acanthodesia perambulata (Louis & Menon, 2009) accepted as Biflustra perambulata Louis & Menon, 2009
• Acanthodesia quadrata Canu & Bassler, 1929 accepted as Biflustra quadrata Canu & Bassler, 1929
• Acanthodesia quadrilatera Canu & Bassler, 1935 † accepted as Biflustra quadrilatera (Canu & Bassler, 1935) †
• Acanthodesia regularis Canu & Bassler, 1935 † accepted as Biflustra regularis (Canu & Bassler, 1935) †
• Acanthodesia savartii (Audouin, 1826) accepted as Biflustra savartii (Audouin, 1826)
• Acanthodesia savartii cetrata (Harmer, 1926) accepted as Biflustra cetrata (Harmer, 1926)
• Acanthodesia savartii monilifera † accepted as Biflustra monilifera (Canu & Bassler, 1919) †