• Bansella Fitzhugh, 2010
• Barsella Schischkinskaja, 1964 †
• Basella Linnaeus, 1753
• Bassiella Wenz in Schindewolf, 1941 † accepted as Hexaplex Perry, 1810
• Beanella Dall, 1882 accepted as Lepidochitona Gray, 1821
• Beanella Thiele, 1893
• Bedella Trouessart, 1892 accepted as Bdella Latreille, 1795
• Beella Banner & Blow, 1960
• Beerella Wainstein, 1961
• Beiselia L.L. Forman, 1987
• Beisselia Holzapfel, 1889 †
• Bekella Nikitina, Popov, Neuman, Bassett & Holmer, 2006 †
• Beltella Lake, 1919 †
• Bemella Missarzhevsky, 1969 †
• Benella Kirkaldy, 1906
• Beresella V.N. Makhaev ex V.P. Maslov & E.L. Kulik, 1956 †
• Bergella (A. Gray) Schnizlein, 1843-1870 accepted as Bergia Linnaeus, 1771
• Berkella R. Ross & P.A. Sims, 1978
• Bertella Paetel, 1875 accepted as Berthella Blainville, 1824 [Family: Pleurobranchidae]
• Bertella Pietsch, 1973 [Family: Oneirodidae]
• Beselia Brandt, 1835 (uncertain)
• Besselia H. Nøhr-Hansen & E.B. Koppelhus, 1988 † (uncertain)
• Bessera J.A. Schultes, 1809 (unaccepted) [Family: Boraginaceae]
• Bessera J.H. Schultes, 1829 [Family: Asparagaceae]
• Bessera K.P.J. Sprengel, 1815 accepted as Flueggea Willdenow, 1806 [Family: Phyllanthaceae]
• Bessera Vellozo, 1829 (unaccepted) [Family: Nyctaginaceae]
• Besseria Robineau-Desvoidy, 1830
• Besseya Rydberg, 1903
• Bessiella Conil & Hance in Groessens, Conil & Hennebert, 1979 † (uncertain)
• Bessula Grote, 1881 (uncertain)
• Beszella Hippa, 1968 (uncertain)
• Beuella Lesport, Cluzaud & Verhecken, 2015 †
• Bewsiella Domrow, 1958
• Beziella Enderlein, 1937
• Bissulla Soares & Soares, 1954 accepted as Bissula Roewer, 1929
• Bistella Adanson, 1763 accepted as Vahlia Thunberg, 1782
• Bosasella Bonaduce, 1985
• Bossiella P.C. Silva, 1957
• Buesiella C. Schweinfurth, 1952 (uncertain)
• Bursella Schmidt, 1921 [Family: Holophryidae]
• Bursella Turpin, 1828 (uncertain) [Family: Rotifera (awaiting allocation)]
• Busella Gray, 1870 accepted as Gorgonia Linnaeus, 1758
• Busseella P. Hennings, 1902 accepted as Cephaleuros Kunze ex E.M. Fries, 1832
• Busseëlla Hennings, 1902 represented as Busseella P. Hennings, 1902 accepted as Cephaleuros Kunze ex E.M. Fries, 1832
• Gessella C. Poulsen, 1974 †
• Hessella Brady, 1883 accepted as Pennella Oken, 1815
• Tessella Breyer, 1957 [Family: Erebidae]
• Tessella C.G. Ehrenberg, 1836 accepted as Rhabdonema Kützing, 1844 [Family: Rhabdonemataceae]
• Tessella G. Playfair, 1915 accepted as Neotessella B.Y. Jo, J.I. Kim, W. Shin, P. Škaloud & P. Siver, 2016 [Family: Neotessellaceae]