duckbill sleeper
Butis butis (Hamilton, 1822)
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
Butis butis, the crazy fish, duckbill sleeper, or upside-down sleeper, Ikan Ubi is a species of sleeper goby that are native to brackish and freshwater coastal habitats of the Indian Ocean and the western Pacific Ocean from the African coast to the islands of Fiji. They prefer well-vegetated waters and can frequently be found in mangrove swamps. They are small, drably-colored fish, reaching a maximum length of only 15 cm (5.9 in). They are predatory and are known for their behavior of swimming vertically – or even upside down – while hunting.
Wikipedia contributors, Crazy fish; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T05:59:58.985332+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Butis butis (Hamilton, 1822)
- Name authority
- (Hamilton, 1822)
- Common name
- duckbill sleeper
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Teleostei
- Order
- Gobiiformes
- Family
- Butidae
- Genus
- Butis
- Extinction status
- Not supplied by this source
Source habitat flags: Marine: yes · Freshwater: yes · Terrestrial: no. These do not form a complete habitat description.
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
- gigaclassActinopterygii
- superclassActinopteri
- classTeleostei
- orderGobiiformes
- familyButidae Bleeker, 1874
- genusButis Bleeker, 1856
- speciesButis butis (Hamilton, 1822)
Close classified relatives
These entries share the source’s genus, Butis. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Butis prismatica (Bleeker, 1849) | ButidaeChordata | Accepted speciesExtinction status not supplied |
| Butis amboinensis (Bleeker, 1853) | ButidaeChordata | Accepted speciesExtinction status not supplied |
| Butis bargabhimae Maiti, Mandal, Das, Pahari & Bhattacharya, 2026 | ButidaeChordata | Accepted speciesExtinction status not supplied |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Eleotris butis (Hamilton, 1822) (Hamilton, 1822) | synonym |
| Elestris butis (Hamilton, 1822) (Hamilton, 1822) | synonym |
| Cheilodipterus butis Hamilton, 1822 Hamilton, 1822 | synonym |
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.marinespecies.org/aphia.php?p=taxdetails&id=219351 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:NZ3X. Classification follows source parent identifiers. English common names may vary by region.