• [non-Uristidae] albinus (K.H. Barnard, 1932): Exoskeleton (including shells)
• [non-Uristidae] dawsoni Hurley, 1963: Exoskeleton (including shells)
• [non-Uristidae] georgianus (Schellenberg, 1931): Exoskeleton (including shells)
• [non-Uristidae] natalensis K.H. Barnard, 1916: Exoskeleton (including shells)
• Aahithis erraticus (Schallreuter, 1985) †: Exoskeleton (including shells)
• Aahithis vanspronsenae Schallreuter, 1988 †: Exoskeleton (including shells)
• Aaleniella (Aaleniella) compressa Plumhoff, 1963 †: Exoskeleton (including shells)
• Aaleniella (Danocythere) gracilis Christensen & Kilenyi, 1970 †: Exoskeleton (including shells)
• Aaleniella (Danocythere) inornata (Kilenyi, 1969) †: Exoskeleton (including shells)
• Aaleniella cuneata Wakefield, 1994 †: Exoskeleton (including shells)
• Aaleniella franzi Tesakova, E. M. †: Exoskeleton (including shells)
• Aaleniella reticulata Knitter, 1983 †: Exoskeleton (including shells)
• Aaleniella volganica Tesakova, E. M. †: Exoskeleton (including shells)
• Aatolana rapax Bruce, 1993: Exoskeleton (including shells)
• Aatolana schioedtei (Miers, 1884): Exoskeleton (including shells)
• Aatolana springthorpei Keable, 1998: Exoskeleton (including shells)
• Abatetia robusta (Parent, 1933): Exoskeleton (including shells)
• Abathescalpellum fissum (Hoek, 1907): Exoskeleton (including shells)
• Abathescalpellum koreanum (Hiro, 1933): Exoskeleton (including shells)
• Abathomphalus asteroidalis Salaj, 1983 †: Exoskeleton (including shells)
• Abathomphalus intermedius (Bolli, 1951) †: Exoskeleton (including shells)
• Abathomphalus mayaroensis (Bolli, 1951) †: Exoskeleton (including shells)
• Abathomphalus salajensis Solakius, 1983 †: Exoskeleton (including shells)
• Abdia latipalpus (Walker & Scott, 1903): Exoskeleton (including shells)
• Abditacythere subterranea Hartmann, 1964: Exoskeleton (including shells)
• Abditodentrix pseudothalmanni (Boltovskoy & Guissani de Kahn, 1981): Exoskeleton (including shells)
• Abditoloculina filaloculina Tillman & Murphy, 1978 †: Exoskeleton (including shells)
• Abebaioscia troglodytes Vandel, 1973: Exoskeleton (including shells)
• Aberisphaera gambanica Wan, 1991 †: Exoskeleton (including shells)
• Aberomysis muranoi Bacescu & Iliffe, 1986: Exoskeleton (including shells)
• Aberratylus aberrantis (J.L. Barnard, 1962): Exoskeleton (including shells)
• Aberroconcha plicata Adamczak, 1961 †: Exoskeleton (including shells)
• Abgrallaspis cyanophylli (Signoret, 1869): Exoskeleton (including shells)
• Ablabesmyia mala (Hutton, 1902): Exoskeleton (including shells)
• Abludogammarus flavus (Dybowsky, 1874): Exoskeleton (including shells)
• Abludomelita aculeata (Chevreux, 1911): Exoskeleton (including shells)
• Abludomelita amoena (Hansen, 1888): Exoskeleton (including shells)
• Abludomelita breviarticulata (Ren, 2012): Exoskeleton (including shells)
• Abludomelita denticulata (Nagata, 1965): Exoskeleton (including shells)
• Abludomelita gladiosa (Spence Bate & Westwood, 1862): Exoskeleton (including shells)
• Abludomelita huanghaiensis (Ren, 2012): Exoskeleton (including shells)
• Abludomelita japonica (Nagata, 1965): Exoskeleton (including shells)
• Abludomelita klitinii Labay, 2016: Exoskeleton (including shells)
• Abludomelita machaera (K.H. Barnard, 1955): Exoskeleton (including shells)
• Abludomelita mucronata (Griffiths, 1975): Exoskeleton (including shells)
• Abludomelita obtusata (Montagu, 1813): Exoskeleton (including shells)
• Abludomelita okhotensis Labay, 2016: Exoskeleton (including shells)
• Abludomelita richardi (Chevreux, 1900): Exoskeleton (including shells)
• Abludomelita rotundactyla (Ren, 2012): Exoskeleton (including shells)
• Abludomelita somovae (Bulyčeva, 1952): Exoskeleton (including shells)
• Abludomelita unamoena (Hirayama, 1987): Exoskeleton (including shells)
• Aboilia blessi Becker & Adamczak, 1993 †: Exoskeleton (including shells)
• Abormon capillosum Mitra, Pati & Ng, 2021: Exoskeleton (including shells)
• Abormon praecalvum Mitra, Pati & Ng, 2021: Exoskeleton (including shells)
• Aborolobatea insidiosa Hughes & Lowry, 2009: Exoskeleton (including shells)
• Aborolobatea paracheliformis Ledoyer, 1984: Exoskeleton (including shells)
• Abortelphusa namdaphaensis Mitra, 2020: Exoskeleton (including shells)
• Abortivelum truncatum Berdan & Copeland, 1973 †: Exoskeleton (including shells)
• Abrocythereis feishania Hu & Tao, 2008: Exoskeleton (including shells)
• Abrocythereis guangdongensis Gou in Gou, Zheng & Huang, 1983 †: Exoskeleton (including shells)
• Abrocythereis jyhemouia Hu & Tao, 2008: Exoskeleton (including shells)
• Abrocythereis keyi (Kingma, 1948) †: Exoskeleton (including shells)
• Abrocythereis malaysiana Malz & Tabuki, 1988: Exoskeleton (including shells)
• Abrocythereis punctata (Hu, 1986) †: Exoskeleton (including shells)
• Abrocythereis ryukyuensis Malz & Tabuki, 1988 †: Exoskeleton (including shells)
• Abrocythereis taiwanica Malz & Tabuki, 1988 †: Exoskeleton (including shells)
• Abrocythereis tungyei Hu & Tao, 2008 †: Exoskeleton (including shells)
• Abroscelis anchoralis (Chevrolat, 1845): Exoskeleton (including shells)
• Abrotanais geniculum Gellert & Błażewicz, 2018: Exoskeleton (including shells)
• Absonocytheropteron carinatum Puri, 1957 †: Exoskeleton (including shells)
• Absonocytheropteron watervalleyense Krutak, 1961 †: Exoskeleton (including shells)
• Abyssamina incisa Schnitker & Tjalsma, 1980 †: Exoskeleton (including shells)
• Abyssamina poagi Schnitker & Tjalsma, 1980 †: Exoskeleton (including shells)
• Abyssamina quadrata Schnitker & Tjalsma, 1980 †: Exoskeleton (including shells)
• Abyssaranea minuta Golovan & Malyutina in Golovan, Malyutina & Sharina, 2023: Exoskeleton (including shells)
• Abyssaranea rupis Wilson & Hessler, 1974: Exoskeleton (including shells)
• Abyssarcturella cidaris Poore & Bardsley, 1992: Exoskeleton (including shells)
• Abyssarcturella panope Poore & Bardsley, 1992: Exoskeleton (including shells)
• Abyssarcturus averincevi Kussakin & Vasina, 1995: Exoskeleton (including shells)
• Abyssianira acutilobi Doti & Roccatagliata, 2006: Exoskeleton (including shells)
• Abyssianira argentenensis Menzies, 1962: Exoskeleton (including shells)
• Abyssianira bathyalis Just, 1990: Exoskeleton (including shells)
• Abyssianira dentifrons Menzies, 1956: Exoskeleton (including shells)
• Abyssianira lingula Doti & Roccatagliata, 2006: Exoskeleton (including shells)
• Abyssianira tasmaniensis Just, 1990: Exoskeleton (including shells)
• Abyssicaprella galatheae McCain, 1966: Exoskeleton (including shells)
• Abyssobairdia anisovalva Coles & Whatley, 1989 †: Exoskeleton (including shells)
• Abyssobythere guttata Ayress & Whatley, 1989 †: Exoskeleton (including shells)
• Abyssobythere inequivalva Ayress, Correge, Passlow & Whatley, 1996: Exoskeleton (including shells)
• Abyssocypris (Abyssocypris) tipica Bold, 1974 †: Exoskeleton (including shells)
• Abyssocypris abyssophilia (Maddocks, 1969): Exoskeleton (including shells)
• Abyssocypris adunca (Esker, 1968) †: Exoskeleton (including shells)
• Abyssocypris atlantica (Maddocks, 1977): Exoskeleton (including shells)
• Abyssocypris boldi Colin, 1987 †: Exoskeleton (including shells)
• Abyssocypris palavensis Pokorny, 1979 †: Exoskeleton (including shells)
• Abyssocypris tipica Bold, 1974 †: Exoskeleton (including shells)
• Abyssocythere atlantica Benson, 1971: Exoskeleton (including shells)
• Abyssocythere australis Benson, 1971: Exoskeleton (including shells)
• Abyssocythere bensoni Brandão, Stuhlmann, Vital & Brandt, 2016: Exoskeleton (including shells)
• Abyssocythere bilobata Colin, 1987 †: Exoskeleton (including shells)