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)

type Bucranium taurifrons O. Pickard-Cambridge, 1881; gender neuter

N.B.: removed from the synonymy of Aphantochilus O. Pickard-Cambridge, 1870 by Teixeira, Campos & Lise, 2014: 73 (contra Benjamin, 2011: 11); considered a senior synonym of Acracanthostoma Mello-Leitão, 1917c: 117 [urn:lsid:nmbe.ch:spidergen:02627] (type A. bicornuta Mello-Leitão, 1917) and Majellula Strand, 1932: 140 [urn:lsid:nmbe.ch:spidergen:02694] by Teixeira, Campos & Lise, 2014: 73; Majellula is a replacement name for Majella O. Pickard-Cambridge, 1896a: 191 [urn:lsid:nmbe.ch:spidergen:05797] (type M. affinis O. Pickard-Cambridge, 1896), preoccupied in Crustacea by Ortmann, 1893.

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.

Majella affinis O. Pickard-Cambridge, 1896a: 191, pl. 24, f. 3 (Df).
Majella affinis F. O. Pickard-Cambridge, 1900: 165, pl. 11, f. 6 (f).
Majellula affinis Strand, 1932: 140 (generic replacement name).
Bucranium affinis Teixeira, Campos & Lise, 2014: 73 (T from Majellula).

Majellula pulchra Bryant, 1940: 417, pl. 14, f. 190, 197 (Dm).
Bucranium pulchra Teixeira, Campos & Lise, 2014: 73 (T from Majellula).

Bucranium spinigerum O. Pickard-Cambridge, 1891a: 87, pl. 11, f. 11 (Df).
Majella spinigera F. O. Pickard-Cambridge, 1900: 165, pl. 11, f. 7 (f).
Bucranium spinigera Teixeira, Campos & Lise, 2014: 73 (T from Majellula).

Bucranium taurifrons O. Pickard-Cambridge, 1881d: 772, pl. 66, f. 5 (Dj).
Bucranium taurifrons Simon, 1895a: 957, f. 1026-1027, 1031 (Dmf).
Bucranium taurifrons Canals, 1933b: 4, f. 1-5 (mf).
Acracanthostoma nigritarsis Caporiacco, 1947a: 29 (Dm) [urn:lsid:nmbe.ch:spidersp:030141].
Acracanthostoma nigritarsis Caporiacco, 1948a: 691, f. 113-115 (m).
Aphantochilus taurifrons Benjamin, 2011: 11, f. 7H, 15A-D, 16A-F, 17A-F (mf).
Bucranium taurifrons Teixeira, Campos & Lise, 2014: 73, f. 7B, 9F, H, 10B, 11B, 12B, 13B, G, 14B-C, 15E-F, 17D-F (mf, S of Acracanthostoma nigritarsis).
Bucranium taurifrons Carvalho & Gasnier, 2019: CB49, f. 237-240 (mf).