Catasetum tenebrosum is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Cymbidieae, subtribe: Catasetinae,  
Genus Catasetum   subgenus Catasetum  section: Isoceras   subsection: Convergentes 
Infraspecific taxa recognized within Catasetum tenebrosum: infraspecific taxa
This species is found in SE. Ecuador to Peru and Brazil (Pará).