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Characiformes (Characins) >
Stevardiidae (Stevardiids) > Diapominae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); guajajara: Name 'guajajara' in honor of Guajajara indigenous tribe, which is one of the most numerous indigenous peoples in Brazil. A noun in 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 : 3.7 cm SL mâle / non sexé; (Ref. 128405)
Description synthétique
Clés d'identification | Morphologie | Morphométrie
Rayons mous dorsaux (Total) : 7 - 8; Rayons mous anaux: 20 - 25; Vertèbres: 33 - 35. This species is distinguished from its congeners by the following set of characters: complete lateral line; caudal fin lobes with sparse chromatophores and absence of basal blotches; 20-25 branched rays in the anal-fin (mode 23); single humeral spot; conspicuous round humeral blotch; hyaline dorsal-fin; 4 or 5 rows of scales between the lateral line and the dorsal-fin origin; 12 or 13 scales in the median series between the tip of the supraoccipital spine and the dorsal-fin origin; 3 to 5 maxillary teeth; 3 or 4 tricuspid teeth in the premaxillary outer row; 3 to 5 maxillary teeth; 3 to 5 cusps on the teeth of the inner row of the premaxilla; 12 circumpeduncular scales; and total vertebrae 33-35, mode 34 (Ref. 128405).
Body shape (shape guide): elongated.
Cycle de vie et comportement reproducteur
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Aguiar, R.G., E.C. Guimarães, P.S. de Brito, J.P. Santos, A.M. Katz, L.J.B. da S. Dias, L.F. Carvalho-Costa and F.P. Ottoni, 2022. A new species of Knodus (Characiformes: Characidae), with deep genetic divergence, from the Mearim and Munim river basins, Northeastern Brazil, and evidence for hidden diversity in adjacent river basins. Neotrop. Ichthyol. 20(2):1-27. (Ref. 128405)
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
Outils
Articles particuliers
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Sources Internet
Estimations basées sur des modèles
Indice de diversité phylogénétique (Réf. 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=0.00776 (0.00346 - 0.01741), 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). 🛈 |