Biddulphia granulata Roper, 1859 † accepted as
Cerataulus granulatus (Roper) P.A. Sims & D.M. Williams, 2018 † (original description)
Biddulphia indica (Ehrenberg) Roper, 1859 accepted as
Denticella indica Ehrenberg, 1845 (new combination reference)
Biddulphia laevis Ehrenberg, 1843 (taxonomy source)
Biddulphia radiata W.Smith accepted as
Eupodiscus radiatus W. Smith, 1853 (new combination reference)
Biddulphia reticulata f. reticulata Roper, 1859 (original description)
Biddulphia reticulata var. beta Roper, 1859 (original description)
Biddulphia tumida var. tumida (Ehrenberg) Roper, 1859 accepted as
Denticella tumida Ehrenberg, 1844 (1845) (new combination reference)
Biddulphia tuomeyi f. tuomeyi (J.W. Bailey) Roper, 1859 accepted as
Zygoceros tuomeyi J.W.Bailey, 1844 (new combination reference)