• Spicellum Nicot & Roquebert, 1976
• Spinellus Van Tieghem, 1875
• Spiralum J.L. Mulder, 1975
• Spirella Costantin in Lecomte, 1912 accepted as Tylophora R. Brown, 1810 [Family: Apocynaceae, Class: Magnoliopsida]
• Spirella Hagenow, 1851 (uncertain) [Family: Bryozoa (awaiting allocation), Class: Bryozoa (awaiting allocation)]
• Spirella Vdovenko in Vdovenko, Gibshman, Lipina & Reitlinger, 1996 † (uncertain) [Family: , Class: Foraminifera (awaiting allocation)]
• Spirellea E. Knobloch & D.H. Mai, 1984 †
• Spirellus Jiang in Luo et al., 1982 †
• Spirillium Zittel, 1880 † (unaccepted)
• Spirillum Diesing, 1848 (uncertain) [Class: Protozoa (awaiting allocation), Family: ]
• Spirillum Ehrenberg, 1832 (Approved Lists, 1980) [Class: Betaproteobacteria, Family: Spirillaceae]
• Spirillum Hassall, 1845 accepted as Spirulina Turpin ex Gomont, 1892 [Class: Cyanophyceae, Family: Spirulinaceae]
• Spirillum Oken, 1807 accepted as Circeis Saint-Joseph, 1894 [Class: Polychaeta, Family: Serpulidae]
• Spirillus J. Gay, 1854 (uncertain) [Family: Potamogetonaceae]
• Spirillus Schlüter, 1838 (uncertain) [Family: Fasciolariidae]
• Spirilum Rafinesque, 1815 † (unaccepted)
• Sterellum P.A. Karsten, 1889 accepted as Peniophora Cooke, 1879