Tanquana in Bot. Jahrb. Syst. 106: 479. 1986 sec. Hartmann (2001b)
- Type: Tanquana archeri
Based on differences in fruit morphology, Hartmann & Liede (1986) excluded three species from Pleiospilos and established a new genus for them, Tanquana. However, its previously recognised close relationship to Pleiospilos was confirmed by Klak & al. (2013), and is also corroborated by leaf-morphological characters (Hartmann & Liede 1986).