Unspotted Saw-whet Owl

SCI Name:  Aegolius ridgwayi
Protonym:  Cryptoglaux ridgwayi Proc.Biol.Soc.Wash. 18 p.217
Taxonomy:  Strigiformes / Strigidae / Aegolius
Taxonomy Code:  uswowl1
Type Locality:  Cerro de la Candelaria, -near Escasu, Costa Rica.
Author:  Alfaro
Publish Year:  1905
IUCN Status:  Least Concern

DEFINITIONS

AEGOLIUS
(Strigidae; Ϯ Tengmalm's Owl A. funereus) L. aegolius  screech owl  < Gr. αιγωλιος aigōlios  bird of ill omen living in rocks and caves, probably some sort of owl; "11. Strix Tengmalmi.   ...   11. Bergkauz. Aegolius. (Strix Tengmalmi.)  Entw[ickelung]. Die Fußwurzeln und die verkürzten Zehen werden befiedert, Flügel und Schwanz kürzer, der Kopf dicker, und die Ohröffnungen sehr groß.   Char[akter]. Käuze mit dick befiederten Fußwurzeln und Zehen, und großen Ohröffnungen.   Leb[ensart]. Sie lieben Gebirgswaldung und leben wie die übrigen kleinen Eulen, von Mäusen." (Kaup 1829); "Aegolius Kaup, Skizz. Entw.-Gesch. Eur. Thierw., 1829, p. 34. Type, by monotypy, Strix tengmalmi Gmelin = Strix funereus Linné, 1758." (Peters 1940, IV, p. 171).
Var. Aegolia.
Synon. Cryptoglaux, Gisella, Glaux, Microscops, Nudipedes, Nyctala, Nyctalatinus, Ptilipedes, Scotophilus.

aegolius
L. aegolius  screech owl  < Gr. αιγωλιος aigōlios  bird of ill omen living in rocks and caves, probably some sort of owl (syn. Asio flammeus).

ridgway / ridgwayi
Robert Ridgway (1850-1929) US ornithologist, Smithsonian Curator of Birds 1880-1929 (Aegolius, syn. Amazona leucocephala, subsp. Anous stolidus, Antrostomus, subsp. Arremonops rufivirgatus, Baeolophus, syn. Basileuterus culicivorus, Buteo, subsp. Buteogallus urubitinga, subsp. Camptostoma imberbe, subsp. Certhidea fusca, subsp. Chasiempis sandwichensis, subsp. Cochlearius cochlearius, subsp. Colinus virginianus, Cotinga, subsp. Cyanocitta stelleri, subsp. Dendrocincla fuliginosa, syn. Dendrocolaptes certhia concolor, syn. Dryobates scalaris parvus, subsp. Fregata minor, subsp. Geothlypis poliocephala, Glaucidium, subsp. Icterus icterus, subsp. Jacamerops aureus, subsp. Lagopus muta, subsp. Leiothlypis ruficapilla (ex Helmithophaga ruficapilla gutturalis Ridgway, 1874), subsp. Loxigilla noctis, syn. Megascops trichopsis, subsp. Myiobius atricaudus, Nesotriccus, subsp. Pandion haliaetus, syn. Passerella iliaca insularis, subsp. Pheugopedius coraya, Plegadis, subsp. Psarocolius wagleri, subsp. Scardafella squammata, Stelgidopteryx, Thalurania, subsp. Thryorchilus browni, subsp. Xenops genibarbis).

SUBSPECIES

Unspotted Saw-whet Owl (tacanensis)
SCI Name: Aegolius ridgwayi tacanensis
tacanensis
Volcán Tacaná, Chiapas, southern Mexico.

Unspotted Saw-whet Owl (rostratus)
SCI Name: Aegolius ridgwayi rostratus
rostratum / rostratus
L. rostratus  beaked, large-billed  < rostrum  beak.
● “nearly allied to Timalia, but having a moderately stout warbler’s bill” (Blyth 1842) (Trichastoma).

Unspotted Saw-whet Owl (ridgwayi)
SCI Name: Aegolius ridgwayi ridgwayi
ridgway / ridgwayi
Robert Ridgway (1850-1929) US ornithologist, Smithsonian Curator of Birds 1880-1929 (Aegolius, syn. Amazona leucocephala, subsp. Anous stolidus, Antrostomus, subsp. Arremonops rufivirgatus, Baeolophus, syn. Basileuterus culicivorus, Buteo, subsp. Buteogallus urubitinga, subsp. Camptostoma imberbe, subsp. Certhidea fusca, subsp. Chasiempis sandwichensis, subsp. Cochlearius cochlearius, subsp. Colinus virginianus, Cotinga, subsp. Cyanocitta stelleri, subsp. Dendrocincla fuliginosa, syn. Dendrocolaptes certhia concolor, syn. Dryobates scalaris parvus, subsp. Fregata minor, subsp. Geothlypis poliocephala, Glaucidium, subsp. Icterus icterus, subsp. Jacamerops aureus, subsp. Lagopus muta, subsp. Leiothlypis ruficapilla (ex Helmithophaga ruficapilla gutturalis Ridgway, 1874), subsp. Loxigilla noctis, syn. Megascops trichopsis, subsp. Myiobius atricaudus, Nesotriccus, subsp. Pandion haliaetus, syn. Passerella iliaca insularis, subsp. Pheugopedius coraya, Plegadis, subsp. Psarocolius wagleri, subsp. Scardafella squammata, Stelgidopteryx, Thalurania, subsp. Thryorchilus browni, subsp. Xenops genibarbis).