Classificatie / Namen
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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.
Milieu: milieu / Klimaatzone / Diepte / verspreidingsgebied
Ecologie
; zoet water benthopelagisch. Tropical
South America: Brazil.
Grootte / Gewicht / Leeftijd
Maturiteit: Lm ?  range ? - ? cm
Max length : 8.3 cm SL mannelijk / geslacht onbekend; (Ref. 128404)
Korte beschrijving
Determinatiesleutels | Morfologie | Morfometrie
Dorsale zachte stralen (totaal) : 8; Anale zachte stralen: 15 - 19; Wervels: 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.
Levenscyclus en paargedrag
Maturiteit | Voortplanting | Paaien | Eieren | Fecunditeit | Larven
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)
Status op de Rode Lijst van het IUCN (Ref. 130435: Version 2025-2 (Global))
Gevaar voor de mens
Harmless
Gebruik door de mens
Visserij: van geen belang
Tools
Speciale rapporten
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Schattingen op basis van modellen
Fylogenetische diversiteitsindex (Ref. 82804) |
PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high]. |
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Bayesian length-weight
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a=0.01259 (0.00551 - 0.02875), b=3.01 (2.82 - 3.20), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245). |
Trofisch niveau (Ref. 69278) |
3.3 ±0.4 se; based on size and trophs of closest relatives |
Kwetsbaarheid van de visserij (Ref. 59153) |
Low vulnerability (10 of 100). 🛈 |