Synonyms: Echinocactus sanjuanensis; Eriosyce megliolii; Eriosyce vertongenii; Malacocarpus sanjuanensis; Neoporteria megliolii (homotypic); Neoporteria sanjuanensis; Neoporteria umadeave marayesensis; Neoporteria umadeave var. marayesensis; Neoporteria villicumensis (homotypic); Pyrrhocactus marayesensis; Pyrrhocactus megliolii (homotypic); Pyrrhocactus sanjuanensis; Pyrrhocactus strausianus var. sanjuanensis; Pyrrhocactus umadeave var. marayesensis; Pyrrhocactus vertongenii; Pyrrhocactus villicumensis (homotypic)