Classification / Names
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Characiformes (Characins) >
Anostomidae (Headstanders)
Etymology: Pseudanos: Derived from Greek, pseudes = false (Ref. 45335); varii: Named for Richard P. Vari, ichthyologist from the National Museum of Natural History, Washington D.C., in recognition of his vast, invaluable contribution to the knowledge of systematics of characiform fishes, particularly the anostomoid fishes..
Environment: milieu / climate zone / depth range / distribution range
Écologie
; eau douce benthopélagique. Tropical
South America: Rio Negro basin in Brazil, Río Síapa and Río Atabapo in Venezuela.
Taille / Poids / Âge
Maturity: Lm ? range ? - ? cm
Max length : 21.0 cm SL mâle / non sexé; (Ref. 91907)
Description synthétique
Morphologie | Morphométrie
Rayons mous dorsaux (Total): 11-13; Vertèbres: 41 - 43. Distinguished from all other species of Pseudanos by having the following characters: three branchiostegal rays (vs. four in P. gracilis and most specimens of P. winterbottomi); dark transversal bars on dorsum absent (vs. present in P. trimaculatus); dark spots present on the center of each body scale, forming conspicuous, straight dark lines (vs. dark spots absent in P. gracilis; and in some specimens of P. trimaculatus), four midlateral dark blotches on body (vs. usually two, sometimes three or four in P. trimaculatus, or body lacking midlateral blotches and presenting instead a broad midlateral stripe in P. winterbottomi); angle of the dorsal and ventralmost radii of body scales between 40° and 90° (vs. angle between 110° and 180° in P. gracilis and P. trimaculatus); and cranial fontanel opened along its entire length (vs. cranial fontanel partially closed in P. trimaculatus) (Ref. 91907).
Adults occur in blackwater rivers and seasonally flooded forest on shores of river or oxbow lakes (Ref. 91907). Distinct pairs breed on densely grown weedy places (Ref. 205).
Life cycle and mating behavior
Maturité | Reproduction | Frai | Œufs | Fécondité | Larves
Distinct pairs breed on densely grown weedy places (Ref. 205).
Birindelli, J.L.O., F.C.T. Lima and H.A. Britski, 2012. New species of Pseudanos Winterbottom, 1980 (Characiformes: Anostomidae), with notes on the taxonomy of P. gracilis and P. trimaculatus. Zootaxa 3425:55-68. (Ref. 91907)
Statut dans la liste rouge de l'IUCN (Ref. 130435)
Menace pour l'homme
Harmless
Utilisations par l'homme
Plus d'informations
Taille/ÂgeCroissanceLongueur-poidsLongueur-longueurFréquences de longueursMorphométrieMorphologieLarvesDynamique des populations larvairesRecrutementAbondanceBRUVS
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5312 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01096 (0.00533 - 0.02257), b=3.06 (2.89 - 3.23), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Niveau trophique (Ref.
69278): 2.4 ±0.1 se; based on size and trophs of closest relatives
Résilience (Ref.
120179): Milieu, temps minimum de doublement de population : 1,4 à 4,4 années (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (16 of 100).
