Classification / Names
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Characiformes (Characins) >
Acestrorhamphidae (American tetras) > Acestrorhamphinae
Etymology: Psalidodon: Greek, psalis, -idos = scissors + Greek, odous = teeth (Ref. 45335); saguazu: Specific name derived from Guarani language word sa (eye) guazú (large).
Environment: milieu / climate zone / distribuzione batimetrica / distribution range
Ecologia
; acqua dolce benthopelagico. Subtropical
South America: Arroyos Once Vueltas and Shangay of the Río Uruguay in Argentina.
Size / Peso / Age
Maturità: Lm ?  range ? - ? cm
Max length : 9.2 cm SL maschio/sesso non determinato; (Ref. 94153)
Short description
Chiavi di identificazione | Morfologia | Morfometria
Raggi dorsali molli (totale) : 12; Raggi anali molli: 35; Vertebre: 31 - 33. Maxillary teeth two or three; third or fourth tooth of outer premaxillary series inserted posteriorly to the rest; large eye 41-45% HL; first anal fin ray inserted anterior to last dorsal fin ray; anal fin rays iv-vi, 25-29; and perforated scales in lateral line series 37-39 (Ref. 52391).
Inhabits streams with sandy-rocky bottom, riffles, small falls and pools (Ref. 52391).
Life cycle and mating behavior
Maturità | Riproduzione | Deposizione | Uova | Fecundity | Larve
Casciotta, J.R., A.E. Almiron and M.M. Azpelicueta, 2003. A new species of Astyanax from río Uruguay basin, Argentina (Characiformes: Characidae). Ichthyol. Explor. Freshwat. 14(4):329-334. (Ref. 52391)
IUCN Red List Status (Ref. 130435: Version 2025-1)
Threat to humans
Harmless
Human uses
Strumenti
Special reports
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Estimates based on models
Phylogenetic diversity index (Fonte Biblio.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01148 (0.00540 - 0.02440), b=3.09 (2.92 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Trophic level (Fonte Biblio.
69278): 3.0 ±0.3 se; based on size and trophs of closest relatives
Resilienza (Fonte Biblio.
120179): Alto, tempo minimo di raddoppiamento della popolazione meno di 15 mesi (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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