Gymnocharacinus bergii Steindachner, 1903
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
The naked characin (Gymnocharacinus bergii) is a species of freshwater ray-finned fish, a characin belonging to the suborder Characoidei. It is the only species in the genus Gymnocharacinus. This taxon has not been assigned to a particular family within the Characoidei and is considered to be incertae sedis, i.e. its taxonomic affinities are, as yet, unclear. This taxon is the southernmost member of the family (together with some Cheirodon species from Chile) and it is endemic to the headwaters of a stream near Valcheta in northern Patagonia, Argentina, which flow from a thermal spring. It is endangered because of competition from the Uruguay tetra (Cheirodon interruptus) and predation from the rainbow trout (Oncorhynchus mykiss), both being invasive species within the naked tetra's restricted range. The naked tetra attains a maximum total length of 7.5 cm (3.0 in). Adults have no scales.
Wikipedia contributors, Naked characin; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T22:40:45.107461+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Gymnocharacinus bergii Steindachner, 1903
- Name authority
- Steindachner, 1903
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Teleostei
- Order
- Characiformes
- Family
- Characidae
- Genus
- Gymnocharacinus
- Extinction status
- Not supplied by this source
Source habitat flags: Marine: no · 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
- orderCharaciformes
- suborderCharacoidei
- familyCharacidae Latreille, 1825
- subfamilyCharacidae_incertae_sedis
- genusGymnocharacinus Steindachner, 1903
- speciesGymnocharacinus bergii Steindachner, 1903
Close classified relatives
No other member of this genus is present in the selected snapshot.
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Gymnocharacinus bergi Steindachner, 1903 Steindachner, 1903 | 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.
- Steindachner, F. (1903). Über einige neue Fisch- und Reptilienarten des k. k. naturhistorischen Hofmuseums. Anzeiger Der Akademie Der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Klasse, v. 40 (no. 3) (for 22 Jan. 1903): 17–18. 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:3HR32. Classification follows source parent identifiers. English common names may vary by region.