(syn. Aegolius Ϯ Tengmalm's Owl A. funereus) Gr. κρυπτος kruptos  hidden; γλαυξ glaux, γλαυκος glaukos  owl; "The generic name of Richardson's and the Saw-whet Owls, Nyctala Brehm, 1828, is preoccupied by Nyctalus Bowdish [sic], 1825, for a genus of mammals, and as no other term appears to be available I will propose Cryptoglaux (κρυπτος, hidden, and γλαυξ, an owl), with Strix tengmalmi Gmelin as the type" (Richmond 1901).

Search for more names on the Key to Scientific Names in Ornithology by James A. Jobling.
Recommended citation
Jobling, J. A. (2019). Key to Scientific Names in Ornithology. In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.) (2019). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 19 January 2019).