Knodus ytuanama

Knodus ytuanama Ferreira & Ohara, 2023

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Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Teleostei (teleosts) > Characiformes (Characins) > Stevardiidae (Stevardiids) > Diapominae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); ytuanama: Name 'ytuanama' from the Tupi words 'ytu' and 'anama', meaning 'waterfall' and 'friend', in reference to the fast-flowing habitat of the new species. A noun in apposition.

Environment: milieu / climate zone / depth range / distribution range Ecology

Freshwater; benthopelagic. Tropical

Distribution Territories | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

South America: Brazil.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 8.3 cm SL male/unsexed; (Ref. 128404)

Short description Identification keys | Morphology | Morphometrics

Dorsal soft rays (total): 8; Anal soft rays: 15 - 19; Vertebrae: 37. This species is distinguished from its congeners by the following set of characters: interradial membranes of the caudal fin thickened, forming folds between the branched rays of the upper and lower lobes; absence of a humeral blotch; presence of a dark, wide midlateral stripe extending along the sides of body from the posterior region of opercle to the middle caudal-fin rays; lateral line complete; absence of a dark blotch on the basis of the first five branched dorsal-fin rays; absence of two symmetric, large dark blotches basally on caudal fin lobes absence of lateral line interrupted many times; absence of midlateral stripe extending to lower lobe of caudal fin; a smaller eye, 28.3-35.0% HL; anal-fin length short, 21.4-24.9% SL; and the absence of a modified glandular tissue on the anal-fin lobe in mature males (Ref. 128404).
Body shape (shape guide): fusiform / normal; Cross section: compressed.

Biology     Glossary (e.g. epibenthic)

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator | Collaborators

Ferreira, K.M. and W.M. Ohara, 2023. A new rheophilic species of Knodus Eigenmann (Characiformes: Characidae: Stevardiinae) from the upper rio Juruena, rio Tapajós basin, Chapada dos Parecis, Mato Grosso, Brazil. Zootaxa 5227(3):365-377. (Ref. 128404)

IUCN Red List Status (Ref. 130435: Version 2025-2)

Not Evaluated 

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

Fisheries: of no interest
FAO - Publication: search | FishSource |

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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GloBI | Google Books | Google Scholar | Google | IGFA World Record | OneZoom | Open Tree of Life | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | TreeBase | Tree of Life | Wikipedia: Go, Search |