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Characiformes (Characins) >
Stevardiidae (Stevardiids) > Diapominae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); borari: Name 'borari' in honor of Boraris, the indigenous group inhabiting the lower Rio Tapajos. A noun of apposition.
Environnement : milieu / zone climatique / profondeur / gamme de distribution
Écologie
; eau douce benthopélagique. Tropical
South America: Brazil.
Taille / Poids / Âge
Maturité: Lm ?  range ? - ? cm
Max length : 3.5 cm SL mâle / non sexé; (Ref. 137788)
Description synthétique
Clés d'identification | Morphologie | Morphométrie
Rayons mous dorsaux (Total) : 8; Rayons mous anaux: 17 - 19; Vertèbres: 35. This species is distinguished from its congeners by the following set of characters: presence of only conical to tricuspid teeth in the inner pre maxillary row and dentary teeth; short maxilla, not exceeding the anterior margin of the orbit in a vertical plane; presence of a black blotch at the base of caudal fin and i,6,i pelvic-fin rays; 6 scales between dorsal-fin origin and lateral line; 13-14 circumpeduncular scales; and short snout(19.6%-22.5%LH) (Ref. 137788).
Body shape (shape guide): elongated; Cross section: compressed.
This species inhabits a moderately fast-flowing stream, 13 meters wide and 1-3 meters deep, with a substrate predominantly composed of rocks, gravel and sand (Ref. 137788).
Cycle de vie et comportement reproducteur
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Silva-Oliveira, C., A.L.C. Canto and F.R.V. Ribeiro, 2023. Knodus borari, a new species from the lower Rio Tapajos basin (Characiformes: Characidae). J Fish Biol. 103:136-142. (Ref. 137788)
Statut dans la liste rouge de l'IUCN (Ref. 130435: Version 2025-2 (Global))
Menace pour l'homme
Harmless
Utilisations par l'homme
Pêcheries: sans intérêt
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Estimations basées sur des modèles
Indice de diversité phylogénétique (Réf.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00343 - 0.01757), b=3.10 (2.91 - 3.29), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Réf.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Vulnérabilité de la pêche (Ref.
59153): Low vulnerability (10 of 100).
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