Masdevallia murex is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Epidendreae, subtribe: Pleurothallidinae,  
Genus Masdevallia   subgenus Masdevallia  section: Coriaceae   subsection: Coriaceae 
Infraspecific taxa recognized within Masdevallia murex: infraspecific taxa
This species is found in Ecuador (Zamora-Chinchipe).