• Theonella Gray, 1868
• Theonella alexandriae Lukowiak, 2021 †
• Theonella annulata Lendenfeld, 1907
• Theonella atlantica van Soest & Stentoft, 1988
• Theonella calyx (Döderlein, 1884) accepted as Discodermia calyx Döderlein, 1884
• Theonella complicata (Carter, 1880)
• Theonella conica (Kieschnick, 1896)
• Theonella cupola Burton, 1928
• Theonella cylindrica Wilson, 1925
• Theonella deliqua Hall, Ekins & Hooper, 2014
• Theonella discifera Lendenfeld, 1907 accepted as Discodermia discifera (Lendenfeld, 1907)
• Theonella ferruginea Zittel, 1878
• Theonella incerta Thiele, 1900
• Theonella invaginata Wilson, 1925
• Theonella lacerata Lendenfeld, 1907
• Theonella laena Lim & Tan, 2016
• Theonella levior Lendenfeld, 1907
• Theonella maricae Hall, Ekins & Hooper, 2014
• Theonella mirabilis (de Laubenfels, 1954)
• Theonella pratti (Bowerbank, 1869) accepted as Theonella swinhoei Gray, 1868
• Theonella prattii (Bowerbank, 1869) accepted as Theonella swinhoei Gray, 1868
• Theonella pulchrifolia Dendy, 1922
• Theonella swinhoei Gray, 1868
• Theonella swinhoei var. verrucosa Wilson, 1925 accepted as Theonella swinhoei Gray, 1868
• Theonella timmi Samaai, Pillay & Janson, 2019
• Theonella wrightae Pisera & Pomponi, 2015
• Theonella xantha (Sutcliffe, Hooper & Pitcher, 2010)