• Biformites Linck, 1949 †
• Bigotites Nicolesco, 1918 †
• Bihorites Jeannel, 1923 accepted as Drimeotus Miller, 1856
• Bilobites J.E. Dekay, 1824 † [Family: Conocardiidae]
• Bilobites Quenstedt, 1869 † accepted as Dicoelosia † [Family: Dicoelosiidae]
• Bilobites Rafinesque, 1831 † (uncertain) [Family: Trilobita (awaiting allocation)]
• Biparetis Amsden, 1974 †
• Bipidites Rafinesque, 1831 (uncertain)
• Diporites T. van der Hammen, 1954 †