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Ancistrus formoso
Conservation status
Vulnerable  (IUCN 3.1)
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Siluriformes
Family:	Loricariidae
Genus:	Ancistrus
Species:	A. formoso
Binomial name
Ancistrus formoso Sabino & Trajano, 1997

Ancistrus formoso is a species of catfish in the family Loricariidae. It is native to South America, where it occurs only in the cave of Buraco do Ducho in the Formoso phreatic system in Brazil. It is a stygobitic species that is known to lack eyes and body pigmentation, which indicate a high level of specialization to living in a subterranean, lightless environment. It is one of three known stygobitic members of Ancistrus, alongside A. cryptophthalmus and A. galani. The species reaches 7.9 cm (3.1 in) SL.

References

1. Instituto Chico Mendes de Conservação da Biodiversidade (ICMBio) (2021). "Ancistrus formoso". IUCN Red List of Threatened Species (in Portuguese). 2021: e.T134660173A134660177. doi:10.2305/IUCN.UK.2021-1.RLTS.T134660173A134660177.pt. Retrieved 22 February 2024.
2. "Ancistrus formoso". Integrated Taxonomic Information System. Retrieved 2022-03-15.
3. Froese, Rainer; Pauly, Daniel, eds. (2021). "Ancistrus formoso". FishBase.

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• IUCN Red List vulnerable species
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• Cave fish
• Suckermouth catfish of Brazil
• Endemic fish of Brazil
• Fish described in 1997
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