''Pristella'' is a

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

fish Fish are aquatic, craniate, gill-bearing animals that lack limbs with digits. Included in this definition are the living hagfish, lampreys, and cartilaginous and bony fish as well as various extinct related groups. Approximately 95% of li ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Characidae Characidae, the characids or characins is a family of freshwater subtropical and tropical fish, belonging to the order Characiformes. The name "characins" is the historical one, but scientists today tend to prefer "characids" to reflect their st ...

. It was formerly a

monotypic taxon In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispe ...

only containing ''

Pristella maxillaris ''Pristella maxillaris'' is a species of characin in the genus '' Pristella'', and is commonly known as the X-ray fish or X-ray tetra because of its translucent body. Description It is a widely distributed and adaptable fish, found in the Am ...

'', but in 2019 a second species, '' Pristella ariporo,'' was described.

Taxonomy

Until 2019, ''Pristella'' was a monotypic genus, but ''P. ariporo'' was described in 2019. Additionally, '' Hyphessobrycon axelrodi'' may belong in ''Pristella'' due to its conical teeth, but further genetic studies are needed to confirm this.

Species

There are currently 3 described species: * '' Pristella ariporo'' * '' Pristella crinogi'' F.C.T. Lima, Caires, R.A., Conde-Saldaña, C.C., Mirande, J.M. & Carvalho, F.R. (2021): ''A new miniature Pristella (Actinopterygii: Characiformes: Characidae) with reversed sexual dimorphism from the rio Tocantins and rio São Francisco basins, Brazil.'' Canadian Journal of Zoology, 99: 339-348. doi: 10.1139/cjz-2020-0241 * ''

References

{{Taxonbar, from=Q3404028 Characidae Ray-finned fish genera Taxa named by Carl H. Eigenmann