Baldia johnstoni Garwood & Bamber, 1988 – synonym of Baldia johnstoni
Bathychaetus heptapous Faubel, 1978 – synonym of Bathychaetus heptapous
Bathynerilla marina – synonym of Nerillidium marinum
Bathynerilla marina Faubel, 1978 – synonym of Nerillidium marinum
Bispira crassicornis Knight-Jones & Perkins, 1998 – synonym of Bispira crassicornis
Bispira volutacornis Fauvel, 1927 – synonym of Bispira volutacornis
Boccardia ligerica – synonym of Polydora ligerica
Boccardia ligerica Ferronière, 1898 – synonym of Polydora ligerica
Boccardia redeki – synonym of Polydora ligerica
Boccardia redeki Kirkegaard, 1996 – synonym of Polydora ligerica
Boccardiella ligerica – synonym of Polydora ligerica
Boccardiella ligerica Blake, 1983 – synonym of Polydora ligerica
Brada granulata – synonym of Brada inhabilis
Brada granulata Haase, 1915 – synonym of Brada inhabilis
Brada inhabilis Støp-Bowitz, 1948 – synonym of Brada inhabilis
Brada villosa Haase, 1915 – synonym of Brada villosa
Branchiomma bombyx Hartmann-Schröder, 1971 – synonym of Branchiomma bombyx
Branchiomma dalyelli – synonym of Branchiomma bombyx
Branchiomma dalyelli Kölliker, 1858 – synonym of Branchiomma bombyx
Branchiomma inconspicua Hartmann-Schröder, 1971 – synonym of Branchiomma inconspicua
Brania limbata Hartmann-Schröder, 1971 – synonym of Brania limbata
Brania pusilla Hartmann-Schröder, 1971 – synonym of Brania pusilla
Bylgia elegans – synonym of Bylgides elegans
Bylgia elegans Théel, 1879 – synonym of Bylgides elegans
Bylgides elegans Chamberlin, 1919 – synonym of Bylgides elegans
Bylgides groenlandicus Pettibone, 1993 – synonym of Bylgides groenlandicus
Bylgides sarsi Pettibone, 1993 – synonym of Bylgides sarsi