• Leptoclinum Milne Edwards, 1842 accepted as Didemnum Savigny, 1816
• Leptoclinum africanus (Michaelsen, 1914) accepted as Didemnum candidum Savigny, 1816
• Leptoclinum albidum (Verrill, 1871) accepted as Didemnum albidum (Verrill, 1871)
• Leptoclinum album Oka, 1927 accepted as Didemnum moseleyi (Herdman, 1886)
• Leptoclinum annectens Herdman, 1886 accepted as Didemnum candidum Savigny, 1816
• Leptoclinum asperum Sluiter, 1900 accepted as Didemnum tenue (Herdman, 1886)
• Leptoclinum atropunctatum (Van Name, 1902) accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum biglans Sluiter, 1906 accepted as Didemnum biglans (Sluiter, 1906)
• Leptoclinum bistratum (Sluiter, 1905) accepted as Lissoclinum bistratum (Sluiter, 1905)
• Leptoclinum calificiforme Sluiter, 1909 accepted as Diplosoma virens (Hartmeyer, 1909)
• Leptoclinum candidum (Savigny, 1816) accepted as Didemnum candidum Savigny, 1816
• Leptoclinum carpenteri Herdman, 1886 accepted as Didemnum carpenteri (Herdman, 1886)
• Leptoclinum ceylonicum Herdman, 1906 (uncertain > nomen dubium)
• Leptoclinum cineraceum Sluiter, 1898 accepted as Didemnum cineraceum (Sluiter, 1898)
• Leptoclinum clavatum Sars, 1851 accepted as Distaplia clavata (Sars, 1851)
• Leptoclinum coccineum Drasche, 1883 accepted as Didemnum coccineum (Drasche, 1883)
• Leptoclinum commune Della Valle, 1877 accepted as Didemnum commune (Della Valle, 1877)
• Leptoclinum conchyliatum Sluiter, 1898 accepted as Didemnum conchyliatum (Sluiter, 1898)
• Leptoclinum coriaceum Drasche, 1883 accepted as Didemnum coriaceum (Drasche, 1883)
• Leptoclinum cretaceum Sluiter, 1898 accepted as Didemnum candidum Savigny, 1816
• Leptoclinum densum Nott, 1892 accepted as Didemnum densum (Nott, 1892)
• Leptoclinum discrepans Sluiter, 1909 accepted as Trididemnum discrepans (Sluiter, 1909)
• Leptoclinum durum Milne Edwards, 1841 accepted as Didemnum maculosum (Milne Edwards, 1841)
• Leptoclinum edwardsi Herdman, 1886 accepted as Didemnum edwardsi (Herdman, 1886)
• Leptoclinum fulgens Milne Edwards, 1841 accepted as Didemnum fulgens (Milne Edwards, 1841)
• Leptoclinum fulgidum Giard, 1872 accepted as Didemnum fulgens (Milne Edwards, 1841)
• Leptoclinum gelatinosum Milne Edwards, 1841 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum glaciale Herdman, 1910 (uncertain > nomen dubium)
• Leptoclinum grande Herdman, 1886 accepted as Didemnum grande (Herdman, 1886)
• Leptoclinum granulosum Drasche, 1883 accepted as Didemnum granulosum (Drasche, 1883)
• Leptoclinum ianthimum Sluiter, 1898 accepted as Didemnum psammatode (Sluiter, 1895) accepted as Didemnum psammatodes (Sluiter, 1895)
• Leptoclinum ianthinum Sluiter, 1898 accepted as Didemnum psammatode (Sluiter, 1895) accepted as Didemnum psammatodes (Sluiter, 1895)
• Leptoclinum incanum Herdman, 1899 accepted as Didemnum incanum (Herdman, 1899)
• Leptoclinum japonicum Herdman, 1886 accepted as Didemnum japonicum (Herdman, 1886)
• Leptoclinum jeffreysi Herdman, 1886 accepted as Didemnum jeffreysi (Herdman, 1886)
• Leptoclinum jugosum Herdman & Riddell, 1913 accepted as Polysyncraton jugosum (Herdman & Riddell, 1913)
• Leptoclinum lacazei Giard, 1872 accepted as Polysyncraton lacazei (Giard, 1872)
• Leptoclinum lacteum (Van Name, 1902) accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum lambitum (Sluiter, 1900) accepted as Didemnum lambitum (Sluiter, 1900)
• Leptoclinum listerianum Milne Edwards, 1841 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum lividum Sars, 1851 accepted as Distaplia livida (Sars, 1851)
• Leptoclinum longinquum Sluiter, 1912 accepted as Diplosoma longinquum (Sluiter, 1912)
• Leptoclinum luteolum Verrill, 1871 accepted as Didemnum albidum (Verrill, 1871)
• Leptoclinum macdonaldi (Herdman, 1886) accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum macrolobium Tokioka, 1949 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum maculatum Nott, 1892 accepted as Didemnum maculatum (Nott, 1892)
• Leptoclinum maculosum Milne Edwards, 1841 accepted as Didemnum maculosum (Milne Edwards, 1841)
• Leptoclinum margaritiferae Herdman, 1906 accepted as Leptoclinides dubius (Sluiter, 1909)
• Leptoclinum marginatum Drasche, 1883 accepted as Didemnum coriaceum (Drasche, 1883)
• Leptoclinum marmoratum Sluiter, 1909 accepted as Trididemnum marmoratum (Sluiter, 1909)
• Leptoclinum midori Tokioka, 1954 accepted as Diplosoma simile (Sluiter, 1909)
• Leptoclinum mitsukurii (Oka, 1892) accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum molle (Herdman, 1886) accepted as Didemnum molle (Herdman, 1886)
• Leptoclinum moseleyi Herdman, 1886 accepted as Didemnum moseleyi (Herdman, 1886)
• Leptoclinum multifidum Sluiter, 1909 accepted as Diplosoma multifidum (Sluiter, 1909)
• Leptoclinum neglectum Herdman, 1886 accepted as Didemnum neglectum Herdman, 1886
• Leptoclinum niveum Nott, 1892 accepted as Didemnum candidum Savigny, 1816
• Leptoclinum octogesimum Hartmeyer, 1905 (uncertain > nomen dubium)
• Leptoclinum okai Tokioka, 1949 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum ostrearium (Michaelsen, 1930) accepted as Lissoclinum ostrearium (Michaelsen, 1930)
• Leptoclinum papyraceum Sluiter, 1909 (uncertain > nomen dubium)
• Leptoclinum patella (Gottschaldt, 1898) accepted as Lissoclinum patella (Gottschaldt, 1898)
• Leptoclinum patulum Herdman, 1899 accepted as Didemnum patulum (Herdman, 1899)
• Leptoclinum perforatum Giard, 1872 accepted as Lissoclinum perforatum (Giard, 1872)
• Leptoclinum perspicuum Sluiter, 1909 accepted as Diplosoma translucidum (Hartmeyer, 1909)
• Leptoclinum peyrefittense (Brement, 1913) accepted as Didemnum peyrefittense Brément, 1913
• Leptoclinum polare Hartmeyer, 1903 accepted as Didemnum albidum (Verrill, 1871)
• Leptoclinum propinquum Herdman, 1886 accepted as Trididemnum propinquum (Herdman, 1886)
• Leptoclinum protectum Daumézon, 1908 accepted as Didemnum protectum (Daumézon, 1908)
• Leptoclinum psamathodes Sluiter, 1895 accepted as Didemnum psammatode (Sluiter, 1895) accepted as Didemnum psammatodes (Sluiter, 1895)
• Leptoclinum psammathodes Sluiter, 1895 accepted as Didemnum psammatode (Sluiter, 1895) accepted as Didemnum psammatodes (Sluiter, 1895)
• Leptoclinum psammatodes Sluiter, 1895 accepted as Didemnum psammatode (Sluiter, 1895) accepted as Didemnum psammatodes (Sluiter, 1895)
• Leptoclinum pseudoleptoclinum (Drasche, 1883) accepted as Lissoclinum perforatum (Giard, 1872)
• Leptoclinum punctatum Forbes, 1848 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum pustulosum Sluiter, 1895 (uncertain > nomen dubium)
• Leptoclinum ramosum Herdman, 1906 accepted as Trididemnum sibogae (Hartmeyer, 1910)
• Leptoclinum rayneri Macdonald, 1859 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum roseum (Sars, 1851) accepted as Didemnum roseum Sars, 1851
• Leptoclinum rubicundum Herdman, 1886 accepted as Polysyncraton chondrilla (Michaelsen, 1924)
• Leptoclinum scidula Sluiter, 1900 accepted as Didemnum tuberatum (Nott, 1892)
• Leptoclinum simile Sluiter, 1909 accepted as Diplosoma simile (Sluiter, 1909)
• Leptoclinum siphoniatum Sluiter, 1895 accepted as Didemnum psammatode (Sluiter, 1895) accepted as Didemnum psammatodes (Sluiter, 1895)
• Leptoclinum speciosum Herdman, 1886 accepted as Didemnum speciosum (Herdman, 1886)
• Leptoclinum structum Gottschaldt, 1894 accepted as Didemnum roseum Sars, 1851
• Leptoclinum subflavum Herdman, 1886 accepted as Didemnum subflavum (Herdman, 1886)
• Leptoclinum subviridis Sluiter, 1909 accepted as Leptoclinides subviridis (Sluiter, 1909)
• Leptoclinum takeharai Tokioka, 1951 accepted as Diplosoma listerianum (Milne Edwards, 1841)
• Leptoclinum tenue Herdman, 1886 accepted as Didemnum tenue (Herdman, 1886)
• Leptoclinum thomsoni Herdman, 1886 accepted as Didemnum thomsoni Herdman, 1886
• Leptoclinum tonga Herdman, 1886 accepted as Didemnum tonga (Herdman, 1886)
• Leptoclinum torresii Sluiter, 1895 accepted as Didemnum torresii (Sluiter, 1895)
• Leptoclinum translucidum Hartmeyer, 1909 accepted as Diplosoma translucidum (Hartmeyer, 1909)
• Leptoclinum tridentatum Drasche, 1883 accepted as Didemnum maculosum (Milne Edwards, 1841)
• Leptoclinum tuberatum Nott, 1892 accepted as Didemnum tuberatum (Nott, 1892)
• Leptoclinum varium Sluiter, 1909 accepted as Diplosoma virens (Hartmeyer, 1909)
• Leptoclinum verrucosum Heiden, 1893 (uncertain > nomen dubium)
• Leptoclinum virens Hartmeyer, 1909 accepted as Diplosoma virens (Hartmeyer, 1909)
• Leptoclinum viride Herdman, 1906 accepted as Didemnum viride (Herdman, 1906)