NATURAL HISTORY · CATALOGUE RECORD
Unspotted Saw-whet Owl
Aegolius ridgwayi (Alfaro, 1905)
Source-backed taxonomic record
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Identity & source status
- Scientific name
- Aegolius ridgwayi (Alfaro, 1905)
- Name authority
- (Alfaro, 1905)
- Common name
- Unspotted Saw-whet Owl
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Strigiformes
- Family
- Strigidae
- Genus
- Aegolius
- Extinction status
- Recorded extant
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classAves
- orderStrigiformes
- familyStrigidae
- subfamilySurniinae
- genusAegolius Kaup, 1829
- speciesAegolius ridgwayi (Alfaro, 1905)
Close classified relatives
These entries share the source’s genus, Aegolius. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Buff-fronted OwlAegolius harrisii (Cassin, 1849) | StrigidaeChordata | Accepted speciesRecorded extant |
| Northern Saw-whet OwlAegolius acadicus (J. F. Gmelin, 1788) | StrigidaeChordata | Accepted speciesRecorded extant |
| Boreal OwlAegolius funereus (Linnaeus, 1758) | StrigidaeChordata | Accepted speciesRecorded extant |
| Bermuda Saw-whet OwlAegolius gradyi Olson, 2012 | StrigidaeChordata | Accepted speciesRecorded extinct |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Aegolius ridgwayi ridgwayi (Alfaro, 1905) (Alfaro, 1905) | synonym |
| Aegolius ridgwayi tacanensis R. T. Moore, 1947 R. T. Moore, 1947 | synonym |
| Aegolius ridgwayi rostratus (Griscom, 1930) (Griscom, 1930) | synonym |
| Cryptoglaux ridgwayi Alfaro, 1905 Alfaro, 1905 | synonym |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=686697 Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:64X4K. Classification follows source parent identifiers. English common names may vary by region.