Epithelantha petri Halda & Horáček in Acta Mus. Richnov., Sect. Nat., 7: 72. 2000
Epithelantha petri in Acta Mus. Richnov., Sect. Nat., 7: 72. 2000
Holotype: Mexico, Coahuila: Mexico septentrionalis, (Cerro Bala [Bola]), 1985, J. J. Halda & L. Horáček 850513 (PR: 751519)