• Leucas Brandt, 1873 (uncertain) [Family: Mammalia (awaiting allocation)]
• Leucas R. Brown, 1810 [Family: Lamiaceae]
• Leucas martinicensis (Jacq.) Ait. f.
• Leucascandra Borojevic & Klautau, 2000
• Leucascandra caveolata Borojevic & Klautau, 2000
• Leucascidae Dendy, 1893
• Leucascus Dendy, 1892
• Leucascus albus Cavalcanti, Rapp & Klautau, 2013
• Leucascus amitsbo (Hôzawa, 1929) accepted as Ascoleucetta amitsba (Hôzawa, 1929)
• Leucascus clavatus Dendy, 1893
• Leucascus compressa (Dendy & Frederick, 1924) accepted as Ascoleucetta compressa Dendy & Frederick, 1924
• Leucascus compressus Dendy & Frederick, 1924 accepted as Ascoleucetta compressa Dendy & Frederick, 1924
• Leucascus flavus Cavalcanti, Rapp & Klautau, 2013
• Leucascus insignis (Row & Hôzawa, 1931)
• Leucascus leptoraphis (Jenkin, 1908)
• Leucascus lobatus Rapp, 2004
• Leucascus neocaledonicus Borojevic & Klautau, 2000
• Leucascus protogenes (Haeckel, 1872 sensu Dendy 1891)
• Leucascus roseus Lanna, Rossi, Cavalcanti, Hajdu & Klautau, 2007
• Leucascus simplex Dendy, 1893
• Leucasia Rafinesque, 1837 (uncertain)
• Leucasiella Krotov & Deliamure, 1952 accepted as Synthesium Stunkard & Alvey, 1930
• Leucasiella deliamurei Raga, 1988 accepted as Synthesium deliamurei (Raga, 1988)
• Leucaspidopsis Lindinger, 1932
• Leucaspidopsis crataegi Bodenheimer, 1943 accepted as Salicicola archangelskyae (Lindinger, 1929)
• Leucaspidopsis vayssièrei Lindinger, 1932 accepted as Salicicola vayssierei (Balachowsky, 1928)
• Leucaspis Burmeister, 1835 accepted as Leucospis Fabricius, 1775 [Family: Leucospidae]
• Leucaspis Targioni-Tozzetti, 1869 [Family: Diaspididae]
• Leucaspis affinis Danzig & Pellizzari, 1998 accepted as Leucaspis podocarpi Green, 1929
• Leucaspis affinis Leonardi, 1906 accepted as Leucaspis pini (Hartig, 1839)
• Leucaspis africana Koroneos, 1934 accepted as Salicicola kermanensis (Lindinger, 1905)
• Leucaspis archangelskyae Lindinger, 1929 accepted as Salicicola archangelskyae (Lindinger, 1929)
• Leucaspis bambusae Kuwana, 1902 accepted as Kuwanaspis pseudoleucaspis (Kuwana, 1923)
• Leucaspis bambusicola Takahashi, 1930 accepted as Mixaspis bambusicola (Takahashi, 1930)
• Leucaspis brittini Green, 1929
• Leucaspis bugnicourti Cohic, 1958
• Leucaspis candida Lindinger, 1906 accepted as Leucaspis pini (Hartig, 1839)
• Leucaspis candida Targioni Tozzetti, 1868 accepted as Leucaspis pini (Hartig, 1839)
• Leucaspis carpodeti Brittin, 1937
• Leucaspis cinnamomi Chou, 1985 accepted as Leucaspis einnamomum (Tang, 1977)
• Leucaspis cinnamomum Chou, 1985 accepted as Leucaspis einnamomum (Tang, 1977)
• Leucaspis cockerelli Leonardi, 1903 accepted as Lopholeucaspis cockerelli (Grandpré & Charmoy, 1899)
• Leucaspis coniferarum Hall & Williams, 1962
• Leucaspis cordylinidis Maskell, 1893
• Leucaspis corsa Lindinger, 1905 accepted as Leucaspis signoreti Signoret, 1870
• Leucaspis cupressi Coleman, 1903 accepted as Cupidaspis cupressi (Coleman, 1903)
• Leucaspis einnamomum (Tang, 1977)
• Leucaspis elaeocarpi Brittin, 1937
• Leucaspis ephedrae Marchal, 1909 accepted as Leucaspis riccae Targioni Tozzetti, 1881
• Leucaspis epidaurica Gennadius, 1883 accepted as Leucaspis riccae Targioni Tozzetti, 1881
• Leucaspis formosanus Takahashi, 1931 accepted as Formosaspis formosana (Takahashi, 1931)
• Leucaspis fulchironiae (Boisduval, 1867)
• Leucaspis gigas (Maskell, 1879)
• Leucaspis greeni Brittin, 1937
• Leucaspis hoheriae Brittin, 1937
• Leucaspis hydrangeae Takahashi, 1939 accepted as Lopholeucaspis japonica (Cockerell, 1897)
• Leucaspis incisa Takagi, 1969
• Leucaspis indiae-orientalis Sasscer, 1911 accepted as Salicicola indiaeorientalis (Lindinger, 1911)
• Leucaspis indica Marlatt, 1908 accepted as Radionaspis indica (Marlatt, 1908)
• Leucaspis indica Merrill, 1953 accepted as Radionaspis indica (Marlatt, 1908)
• Leucaspis japonica Fernald, 1903 accepted as Lopholeucaspis japonica (Cockerell, 1897)
• Leucaspis japonica Lindinger, 1906 accepted as Lopholeucaspis japonica (Cockerell, 1897)
• Leucaspis japonicus Cockerell, 1897 accepted as Lopholeucaspis japonica (Cockerell, 1897)
• Leucaspis kelloggi Coleman, 1903 accepted as Stramenaspis kelloggi (Coleman, 1903)
• Leucaspis kermanensis Lindinger, 1905 accepted as Salicicola kermanensis (Lindinger, 1905)
• Leucaspis knemion Hoke, 1925
• Leucaspis lemmeti Balachowsky, 1927 accepted as Leucaspis riccae Targioni Tozzetti, 1881
• Leucaspis leonardi Coleman, 1903 accepted as Leucaspis pusilla Löw, 1883
• Leucaspis leonardii Lindinger, 1907 accepted as Leucaspis pusilla Löw, 1883
• Leucaspis limoniae Rutherford, 1915 accepted as Lopholeucaspis limoniae (Rutherford, 1915)
• Leucaspis loevi Dziedzicka, 1970 accepted as Leucaspis lowi Colvée, 1882
• Leucaspis lowi Colvée, 1882
• Leucaspis löwi Lindinger, 1906 accepted as Leucaspis lowi Colvée, 1882
• Leucaspis löwii Löw, 1883 accepted as Leucaspis lowi Colvée, 1882
• Leucaspis machili Takagi, 1969
• Leucaspis mangiferae Wester, 1920 accepted as Parlatoria pseudaspidiotus Lindinger, 1905
• Leucaspis manii (Borchsenius, 1964)
• Leucaspis maskelli (Brittin, 1915)
• Leucaspis melicyrtides Lindinger, 1957 accepted as Leucaspis melicytidis Brittin, 1937
• Leucaspis melicytidis Brittin, 1937
• Leucaspis menoni Takagi, 1969 accepted as Lopholeucaspis japonica (Cockerell, 1897)
• Leucaspis mixta Boer & Valentine, 1977
• Leucaspis morrisi (Brittin, 1915)
• Leucaspis myersi Green, 1929 accepted as Leucaspis gigas (Maskell, 1879)
• Leucaspis newsteadi Soria et al., 2000 accepted as Lepidosaphes newsteadi (Šulc, 1895)
• Leucaspis nigra Takahashi, 1931 accepted as Formosaspis takahashii (Lindinger, 1932)
• Leucaspis ohakunensis Brittin, 1937
• Leucaspis oleae Lindinger, 1912 accepted as Leucaspis riccae Targioni Tozzetti, 1881
• Leucaspis perezi Green, 1915 accepted as Leucaspis pusilla Löw, 1883
• Leucaspis pini (Hartig, 1839)
• Leucaspis pini Morgan, 1892 accepted as Leucaspis lowi Colvée, 1882
• Leucaspis pini Newstead, 1894 accepted as Leucaspis lowi Colvée, 1882
• Leucaspis pinifoliae García Mercet, 1912 accepted as Chionaspis pinifoliae (Fitch, 1856)
• Leucaspis pistaciae Beccari, 1959 accepted as Salicicola pistaciae (Lindinger, 1906)
• Leucaspis pistaciae Lindinger, 1906 accepted as Salicicola pistaciae (Lindinger, 1906)
• Leucaspis pittospori Brittin, 1937
• Leucaspis podocarpi Green, 1929
• Leucaspis portaeaureae Ferris, 1942
• Leucaspis pusilla Löw, 1883
• Leucaspis quadrispinosa Green, 1934 accepted as Mongrovaspis quadrispinosa (Green, 1934)