• Thyasira Lamarck, 1818
• Thyasira (Axinulus) A. E. Verrill & K. J. Bush, 1898 accepted as Axinulus A. E. Verrill & K. J. Bush, 1898
• Thyasira (Axinulus) cycladia (S. V. Wood, 1848) accepted as Axinulus cycladius (S. V. Wood, 1848)
• Thyasira (Conchocele) Gabb, 1866 accepted as Conchocele Gabb, 1866
• Thyasira (Conchocele) australosulcata Stilwell, 2000 † accepted as Conchocele australosulcata (Stilwell, 2000) †
• Thyasira (Leptaxinus) A. E. Verrill & K. J. Bush, 1898 accepted as Leptaxinus A. E. Verrill & K. J. Bush, 1898
• Thyasira (Maorithyas) C. A. Fleming, 1950 accepted as Maorithyas C. A. Fleming, 1950
• Thyasira (Maorithyas) miyadii T. Habe, 1951 accepted as Thyasira miyadii T. Habe, 1951
• Thyasira (Mendicula) Iredale, 1924 accepted as Mendicula Iredale, 1924
• Thyasira (Mendicula) ferruginea (Locard, 1886) accepted as Mendicula ferruginosa (Forbes, 1844)
• Thyasira (Mendicula) inflata Payne & J. A. Allen, 1991 accepted as Mendicula inflata (Payne & J. A. Allen, 1991)
• Thyasira (Mendicula) ockelmanni Keuning & Schander, 2010 accepted as Mendicula ockelmanni (Keuning & Schander, 2010)
• Thyasira (Mendicula) transversa Payne & J. A. Allen, 1991 accepted as Adontorhina transversa (Payne & J. A. Allen, 1991)
• Thyasira (Parathyasira) Iredale, 1930 accepted as Parathyasira Iredale, 1930
• Thyasira (Parathyasira) dunbari Lubinsky, 1976 accepted as Parathyasira dunbari (Lubinsky, 1976)
• Thyasira (Parathyasira) hexangulata Okutani, 1962 accepted as Thyasira hexangulata Okutani, 1962
• Thyasira (Parathyasira) kawamurai T. Habe, 1951 accepted as Thyasira kawamurai T. Habe, 1951
• Thyasira (Parathyasira) notosulca Stilwell & Zinsmeister, 1992 † accepted as Parathyasira austrosulca (Stilwell, Zinsmeister & Oleinik, 2004) †
• Thyasira (Parathyasira) resupina (Iredale, 1930) accepted as Parathyasira resupina Iredale, 1930
• Thyasira (Philis) P. Fischer, 1861 accepted as Philis P. Fischer, 1861
• Thyasira (Philis) imamurai Okutani, 1962 accepted as Thyasira imamurai Okutani, 1962
• Thyasira (Philis) kanamarui T. Habe, 1951 accepted as Philis kanamarui (T. Habe, 1951)
• Thyasira (Thyasira) Lamarck, 1818 represented as Thyasira Lamarck, 1818
• Thyasira (Thyasira) adelaideana Iredale, 1930 accepted as Channelaxinus adelaideanus (Iredale, 1930)
• Thyasira (Thyasira) baca Devjatilova, 1981 † represented as Thyasira baca Devjatilova, 1981 †
• Thyasira (Thyasira) bartrumi A. W. B. Powell, 1935 † represented as Thyasira bartrumi A. W. B. Powell, 1935 †
• Thyasira (Thyasira) beui Amano, C. Little, K. A. Campbell, R. G. Jenkins & Saether, 2015 † represented as Thyasira beui Amano, C. Little, K. A. Campbell, R. G. Jenkins & Saether, 2015 †
• Thyasira (Thyasira) gouldii (R. A. Philippi, 1845) represented as Thyasira gouldii (R. A. Philippi, 1845)
• Thyasira (Thyasira) marwicki Amano, C. Little, K. A. Campbell, R. G. Jenkins & Saether, 2015 † represented as Thyasira marwicki Amano, C. Little, K. A. Campbell, R. G. Jenkins & Saether, 2015 †
• Thyasira (Thyasira) minoensis Itoigawa, 1960 † represented as Thyasira minoensis Itoigawa, 1960 †
• Thyasira (Thyasira) mironovi Kalishevich, 1981 † represented as Thyasira mironovi Kalishevich, 1981 †
• Thyasira (Thyasira) motutaraensis A. W. B. Powell, 1935 † represented as Thyasira motutaraensis A. W. B. Powell, 1935 †
• Thyasira (Thyasira) nakazawai E. Matsumoto, 1971 † represented as Thyasira nakazawai E. Matsumoto, 1971 †
• Thyasira (Thyasira) nana Khomenko, 1929 † represented as Thyasira nana Khomenko, 1929 †
• Thyasira (Thyasira) obtusa (Beyrich, 1848) † represented as Thyasira obtusa (Beyrich, 1848) †
• Thyasira (Thyasira) oliveri Amano & R. G. Jenkins, 2018 † represented as Thyasira oliveri Amano & R. G. Jenkins, 2018 †
• Thyasira (Thyasira) ozawai Yokoyama, 1926 † represented as Thyasira ozawai Yokoyama, 1926 †
• Thyasira (Thyasira) peregrina (Iredale, 1930) accepted as Prothyasira peregrina Iredale, 1930
• Thyasira (Thyasira) peruviana Olsson, 1931 † represented as Thyasira peruviana Olsson, 1931 †
• Thyasira (Thyasira) polygona (Jeffreys, 1864) represented as Thyasira polygona (Jeffreys, 1864)
• Thyasira (Thyasira) tanabei Kiel, Amano & R. G. Jenkins, 2008 † represented as Thyasira tanabei Kiel, Amano & R. G. Jenkins, 2008 †
• Thyasira (Thyasira) tokunagai (Kuroda & Habe, 1951) represented as Thyasira tokunagai Kuroda & Habe, 1951
• Thyasira (Thyasira) uncinata Kalikevich, 1981 † represented as Thyasira uncinata Kalikevich, 1981 †
• Thyasira (Thyasira) xylodia Kiel & Goedert, 2007 † represented as Thyasira xylodia Kiel & Goedert, 2007 †
• Thyasira acuticarinata (E. A. Smith, 1895)
• Thyasira aequatorialis Jaeckel & Thiele, 1931
• Thyasira albigena Hedley, 1907 accepted as Genaxinus albigena (Hedley, 1907)
• Thyasira alleni Carrozza, 1981 accepted as Axinulus alleni (Carrozza, 1981)
• Thyasira anassa P. G. Oliver, 2015
• Thyasira atlantica Payne & J. A. Allen, 1991 accepted as Thyasira tortuosa (Jeffreys, 1881)
• Thyasira austrosulca Stilwell, Zinsmeister & Oleinik, 2004 † accepted as Parathyasira austrosulca (Stilwell, Zinsmeister & Oleinik, 2004) †
• Thyasira baca Devjatilova, 1981 †
• Thyasira barbarensis (Dall, 1890)
• Thyasira bartrumi A. W. B. Powell, 1935 †
• Thyasira benedenii (De Koninck, 1838) †
• Thyasira beui Amano, C. Little, K. A. Campbell, R. G. Jenkins & Saether, 2015 †
• Thyasira biplicata (R. A. Philippi, 1836)
• Thyasira biscayensis Payne & J. A. Allen, 1991 accepted as Parathyasira biscayensis (Payne & J. A. Allen, 1991)
• Thyasira bisecta (Conrad, 1849) accepted as Conchocele bisecta (Conrad, 1849)
• Thyasira bisecta alta Krishtofovich, 1936 accepted as Conchocele bisecta (Conrad, 1849)
• Thyasira bisecta humila Krishtofovich, 1936 accepted as Conchocele bisecta (Conrad, 1849)
• Thyasira bisecta nipponica Yabe & Nomura, 1925 accepted as Conchocele bisecta (Conrad, 1849)
• Thyasira bongraini (E. Lamy, 1910) accepted as Genaxinus bongraini (E. Lamy, 1910)
• Thyasira borshengi Okutani & Lan, 1999
• Thyasira brevis (A. E. Verrill & K. J. Bush, 1898) accepted as Axinulus brevis (A. E. Verrill & K. J. Bush, 1898)
• Thyasira brongniarti (Deshayes, 1857) †
• Thyasira bushae Payne & J. A. Allen, 1991 accepted as Mendicula bushae (Payne & J. A. Allen, 1991)
• Thyasira capitanea Åström & P. G. Oliver, 2017
• Thyasira carrozae Payne & J. A. Allen, 1991 accepted as Mendicula carrozae (Payne & J. A. Allen, 1991)
• Thyasira chilensis R. A. Philippi, 1887 † (uncertain > unassessed)
• Thyasira compacta Ishizaki, 1942 accepted as Thyasira koyamai (Habe, 1981)
• Thyasira conia Dall & C. T. Simpson, 1901 accepted as Axinus conia (Dall & C. T. Simpson, 1901)
• Thyasira conradii Rosenkrantz, 1942 † accepted as Channelaxinus conradii (Rosenkrantz, 1942) †
• Thyasira crassiuscula Yokoyama, 1927 †
• Thyasira croulinensis (Jeffreys, 1847) accepted as Axinulus croulinensis (Jeffreys, 1847)
• Thyasira cycladia (S. V. Wood, 1848) accepted as Axinulus cycladius (S. V. Wood, 1848)
• Thyasira cygnus Dall, 1916 accepted as Thyasira barbarensis (Dall, 1890)
• Thyasira dearborni Nicol, 1965 accepted as Parathyasira dearborni (Nicol, 1965)
• Thyasira debilis (Thiele, 1912)
• Thyasira dilatata Gaglini, 1992 (uncertain > taxon inquirendum)
• Thyasira disjuncta (Gabb, 1866) accepted as Conchocele bisecta (Conrad, 1849)
• Thyasira disjuncta var. ochotica Krishtofovich, 1936 accepted as Conchocele ochotica (Krishtofovich, 1936)
• Thyasira dubia (Dautzenberg & Fischer, 1897) accepted as Leptaxinus incrassatus (Jeffreys, 1876)
• Thyasira dubia ionica F. Nordsieck, 1974 accepted as Leptaxinus incrassatus (Jeffreys, 1876)
• Thyasira dunbari Lubinsky, 1976 accepted as Parathyasira dunbari (Lubinsky, 1976)
• Thyasira elliptica (A. E. Verrill & K. J. Bush, 1898) accepted as Axinodon ellipticus A. E. Verrill & K. J. Bush, 1898
• Thyasira equalis (A. E. Verrill & K. J. Bush, 1898) accepted as Parathyasira equalis (A. E. Verrill & K. J. Bush, 1898)
• Thyasira eumyaria (M. Sars, 1870) accepted as Axinulus eumyarius (M. Sars, 1870) accepted as Genaxinus eumyarius (M. Sars, 1870)
• Thyasira eutornus (Tomlin, 1921) accepted as Afrophysema eutornus (Tomlin, 1921)
• Thyasira excavata Dall, 1901 accepted as Channelaxinus excavatus (Dall, 1901)
• Thyasira excavata plicata (A. E. Verrill, 1885) accepted as Channelaxinus perplicatus (C. Salas, 1996)
• Thyasira falklandica (E. A. Smith, 1885)
• Thyasira fernandezensis Zelaya, Güller & Bieler, 2024
• Thyasira ferruginea (Locard, 1886) accepted as Mendicula ferruginosa (Forbes, 1844)
• Thyasira ferruginea Winckworth, 1932 accepted as Mendicula ferruginosa (Forbes, 1844)
• Thyasira ferruginosa (Forbes, 1844) accepted as Mendicula ferruginosa (Forbes, 1844)
• Thyasira flexuosa (Montagu, 1803)
• Thyasira flexuosa flexuosa (Montagu, 1803)
• Thyasira flexuosa laevis (Zhizhchenko, 1934) †
• Thyasira flexuosa var. rotunda Jeffreys, 1881 accepted as Thyasira flexuosa (Montagu, 1803)