Classification / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Stevardiinae
Etymology: Knodus: Greek, knodon, -ontos = knife, sword (Ref. 45335); figueiredoi: Named for Dr. José Lima de Figueiredo of MZUSP, in appreciation for his contribution to the taxonomic studies of Neotropical fishes..
Environment: milieu / climate zone / depth range / distribution range
Écologie
; eau douce benthopélagique. Tropical
South America: Rio das Gasças, upper Rio Araguaia basin in Brazil.
Taille / Poids / Âge
Maturity: Lm ? range ? - ? cm
Max length : 3.2 cm SL mâle / non sexé; (Ref. 97362)
Description synthétique
Morphologie | Morphométrie
Rayons mous dorsaux (Total): 10; Vertèbres: 37 - 39. Knodus figueiredoi differs from all other species of the genus by having only tricuspid teeth in the inner premaxillary row (vs. teeth with 5 or 7 cusps). It can be further distinguished from all its congeners by having i,5,i (vs. i,6,i or i,7) pelvic-fin rays. It can be diagnosed from K. breviceps and K. savannensis in having a conspicuous, round humeral blotch (vs. inconspicuous, vertically elongate). It can be further distinguished from K breviceps in having five (vs. six) longitudinal scale rows between the dorsal-fin origin and lateral line, and from K. savannensis in having branched anal-fin rays 15-17 (vs. 20-21), and a hyaline caudal fin (vs. dark longitudinal band on lower caudal-fin lobe). It can be differentiated from Bryconamericus novae, the only species of the genus in the Araguaia-Tocantins basin, in having a conspicuous, round (vs. inconspicuous, vertically elongate) humeral blotch, 15-17 branched anal-fin rays (vs.18-20); five (vs. four) longitudinal scale rows between the dorsal-fin origin and lateral line; four large tricuspid teeth in the dentary (vs. pentacuspid); and presence of scale rows covering the basal portions of the caudal-fin lobe (vs. absence) (Ref. 97362).
The type locality, Rio das Gasças, is a large and relatively deep river characterized by rapid waters and riffles, marginal sandbanks, and transparent water. The bottom of the river consists of stones, sand and moderate amount of the vegetal debris (Ref. 97362).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Esguícero, A.L.H. and R.M.C. Castro, 2014. Knodus figueiredoi, a new characid from the Rio das Garças, upper Rio Araguaia basin, Brazil, with comments on the taxonomic limits with comments on the taxonomic limits Knodus and Bryconamericus (Teleostei: Characidae). Ichthyol. Explor. Freshwat. 25(1):39-48. (Ref. 97362)
Statut dans la liste rouge de l'IUCN (Ref. 130435)
Menace pour l'homme
Harmless
Utilisations par l'homme
Plus d'informations
Noms communsSynonymesMétabolismePrédateursÉcotoxicologieReproductionMaturitéFraiRassemblement de ponteFéconditéŒufsDéveloppement de l'œuf
Taille/ÂgeCroissanceLongueur-poidsLongueur-longueurFréquences de longueursMorphométrieMorphologieLarvesDynamique des populations larvairesRecrutementAbondanceBRUVS
RéférencesAquacultureProfil d'aquacultureSouchesGénétiqueElectrophoresesHéritabilitéPathologiesTraitementNutrientsMass conversion
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01479 (0.00653 - 0.03348), b=2.96 (2.77 - 3.15), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 3.0 ±0.4 se; based on size and trophs of closest relatives
Résilience (Ref.
120179): Haut, temps minimum de doublement de population inférieur à 15 mois (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
