In synonymy:
Acracanthostoma Mello-Leitão, 1917 = Bucranium O. Pickard-Cambridge, 1881 (Teixeira, Campos & Lise, 2014: 73)
Majella O. Pickard-Cambridge, 1896 = Bucranium O. Pickard-Cambridge, 1881 (Teixeira, Campos & Lise, 2014: 73, preoccupied, replaced by Majellula)
Majellula Strand, 1932 = Bucranium O. Pickard-Cambridge, 1881 (Teixeira, Campos & Lise, 2014: 73)
In synonymy:
Bucranium nigritarse (Caporiacco, 1947, T from Acracanthostoma) = Bucranium taurifrons O. Pickard-Cambridge, 1881 (Teixeira, Campos & Lise, 2014: 73)
Nomen dubium:
Bucranium bicornutum (Mello-Leitão, 1917c: 117, f. 8, 1929d: 27, f. 1, f, Brazil, originally in Acracanthostoma) -- Teixeira, Campos & Lise, 2014: 73