Hemigrammus hyanuary

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Hemigrammus hyanuary
Hemigrammus hyanuary thomnight 001.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Characiformes
Family: Acestrorhamphidae
Genus: Hemigrammus
Species:
H. hyanuary
Binomial name
Hemigrammus hyanuary
Durbin, 1918

Hemigrammus hyanuary, the January tetra or Costello tetra, is a species of freshwater ray-finned fish belonging to the family Acestrorhamphidae. This fish is found in the Amazon Basin in South America. This species is uncommonly found in the aquarium trade.

Contents

Taxonomy

Hemigrammus hyanuary was first formally described in 1918 by the American entomologist and ichthyologist Marion Durbin Ellis with its type locality given as Lake Hyanuary in Brazil. This species belongs to the genus Hemigrammus which is classified in the subfamily Pristellinae of the American characin family Acestrorhamphidae. [2] [3] This family is classified within the suborder Characoidei of the order Characiformes. [4]

Distribution

Costello tetras are found in the Amazon Basin.

In the aquarium

Costello tetras have been kept in the aquarium hobby. Some foods aquarists feed them include flakes, pellets, and live foods. Wild caught specimens sport a characteristic golden sheen to their scales, this is due to the presence of a parasite found within their native range that causes the unusual pigmentation, captive bred Costello tetra do not display this coloration, and instead present with a silver iridescent scalation, more typical of many others within the Characidae family. [5]

References

  1. ↑ Lima, F.; Reis, R. (2023). "Hemigrammus hyanuary". IUCN Red List of Threatened Species . 2023 e.T167683A53822345. doi: 10.2305/IUCN.UK.2023-1.RLTS.T167683A53822345.en . Retrieved 23 June 2024.
  2. ↑ Fricke, Ron; Eschmeyer, William N. & van der Laan, Richard (eds.). "Species in the genus Hemigrammus". Catalog of Fishes . California Academy of Sciences . Retrieved 25 October 2025.
  3. ↑ Melo, Bruno F; Ota, Rafaela P; Benine, Ricardo C; et al. (2024-09-01). "Phylogenomics of Characidae, a hyper-diverse Neotropical freshwater fish lineage, with a phylogenetic classification including four families (Teleostei: Characiformes)" . Zoological Journal of the Linnean Society. 202 (1) zlae101. doi:10.1093/zoolinnean/zlae101. ISSN   0024-4082.
  4. ↑ R. Fricke; W. N. Eschmeyer; R. Van der Laan (2025). "ESCHMEYER'S CATALOG OF FISHES: CLASSIFICATION". California Academy of Sciences. Retrieved 25 October 2025.
  5. ↑ "Hemigrammus". Aquarium Glaser GmbH. Retrieved 2024-11-30.


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