[1] William Broderip described the species as Mitra testacea in 1836; the holotype had been collected by Hugh Cuming.

[2] Heinrich Wolfgang Ludwig Dohrn described M. antoni in 1860 from a specimen also in Cuming's collection.

[4] Dohrn's M. antoni should not be confused with M. antonii Küster, 1839, sometimes taken to be its senior homonym.

[6][1] Walter O. Cernohorsky proposed that M. obliqua Lesson, 1842 was a junior synonym of M. testacea,[6] but this also has not been accepted.

[6] Its shell is a light reddish brown color,[8] and can grow to a length of 32 mm (1.3 in).