Neolloydia matehualensis Backeb. Neolloydia matehualensis Backeb. in Spine 1: 108. 1948 sec. Hunt 2016=Neolloydia conoidea var. matehualensis (Backeb.) Kladiwa & Fittkau, Kakteen 48-49: C VIIIb, 15. 1. 1971 syn. sec. Guzmán & al. 2003