Cyornis ruckii (Oustalet, 1881)
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.
Open encyclopedia reference
Rück's blue flycatcher (Cyornis ruckii) is a passerine bird in the Old World flycatcher family Muscicapidae. It is known from only four specimens and is endemic to a small area in northeast Sumatra, Indonesia, inhabiting primary lowland forest. Although all specimens share common characteristics, such as a black bill, brown iris, and black feet, two of the collected specimens show some physical discrepancy with the other two. They were initially described as Cyornis vanheysti before being accepted as specimens of C. ruckii. Rück's blue flycatcher has also been compared to other species of Cyornis.
The species is listed as "Critically Endangered" by the International Union for Conservation of Nature as it has not been recorded since 1918. It has been protected by Indonesian law since 1972. It also might have been affected by the 2004 Indian Ocean tsunami.
Wikipedia contributors, Rück's blue flycatcher; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T13:56:57.100898+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Cyornis ruckii (Oustalet, 1881)
- Name authority
- (Oustalet, 1881)
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Aves
- Order
- Passeriformes
- Family
- Muscicapidae
- Genus
- Cyornis
- 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
- orderPasseriformes
- familyMuscicapidae Fleming, 1822
- genusCyornis Blyth, 1843
- speciesCyornis ruckii (Oustalet, 1881)
Close classified relatives
These entries share the source’s genus, Cyornis. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| White-bellied Blue FlycatcherCyornis pallipes (Jerdon, 1840) | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Blue-throated Blue FlycatcherCyornis rubeculoides (Vigors, 1831) | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Matinan Blue FlycatcherCyornis sanfordi Stresemann, 1931 | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Pale Blue FlycatcherCyornis unicolor Blyth, 1843 | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Hill Blue FlycatcherCyornis banyumas (Horsfield, 1821) | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Blue-breasted Blue FlycatcherCyornis herioti R. G. W. Ramsay, 1886 | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Tickell's Blue FlycatcherCyornis tickelliae Blyth, 1843 | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Palawan Blue FlycatcherCyornis lemprieri (Sharpe, 1884) | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Cyornis djampeanus (Hartert, 1896) | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Pale-chinned Blue FlycatcherCyornis poliogenys W. E. Brooks, 1880 | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Cyornis rufigastra (Raffles, 1822) | MuscicapidaeChordata | Accepted speciesRecorded extant |
| Bornean Blue FlycatcherCyornis superbus Stresemann, 1925 | MuscicapidaeChordata | Accepted speciesRecorded extant |
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=559664 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:33BB5. Classification follows source parent identifiers. English common names may vary by region.