Classification / Names
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Characiformes (Characins) >
Characidae (Characins; tetras) > Tetragonopterinae
Etymology: Tetragonopterus: Name from Greek words: 'Tetra' meaning four; 'gonia' meaning angle; 'pteron' for fin; referring to the evident tetragonal shape of the body (Ref. 124043); araguaiensis: The specific name araguaiensis is in reference to the major drainage of the type-locality, the Rio Araguaia, a large tributary of the Amazon basin, central Brazil.
Environment: milieu / climate zone / depth range / distribution range
Ekologi
; sötvatten pelagiska. Tropical
South America: middle portion of the Rio Araguaia in Brazil.
Size / Vikt / Age
Maturity: Lm ? range ? - ? cm
Max length : 6.3 cm SL hane/ej könsbestämd; (Ref. 93280)
Mjukstrålar i ryggfenan (totalt) : 9; Mjukstrålar i analfenan: 37 - 40. This species is distinguished from its congeners except Tetragonopterus anostomus by the number of gill rakers on the upper and lower limbs of the first gill arch, 10-12 and 18-20, respectively (vs. 8-10 and 12-14); differs from T. anostomus by the terminal mouth (vs. subsuperior); differs from T. anostomus, T. kuluene, T. juruena, T. denticulatus in the number of principal teeth in the dentary 4 (vs. 5-6) and also by having larger and more robust teeth (vs. thinner and sharper teeth); differs from T. argenteus by the number of predorsal scales 7-9 (vs. 111-17); differs from T. carvalhoi by having a spot on the caudal peduncle that is round (vs. lozenge-shaped spot); differs from T. ommatus by the teeth on the maxilla 0-2 (vs. 7-8) and having a centered mark on the caudal peduncle (vs. limited to the posterior portion of the caudal peduncle); differs from T. rarus, T. georgiae by the scale rows between lateral line and pelvic-fin origin 3.5 (vs. 4.5-5.5); differs from T. rarus by the lack of dark stripes on the lateral surface of the body (vs. the presence of such stripes) (Ref. 124043).
Life cycle and mating behavior
Könsmognad | Reproduktion | Lek | Ägg | Fecundity | Larver
Silva, G.S.C., B.F. Melo, C. Oliveira and R.C. Benine, 2016. Revision of the South American genus Tetragonopterus Cuvier, 1816 (Teleostei: Characidae) with description of four new species. Zootaxa 4200(1):1-46. (Ref. 124043)
IUCN Red List Status (Ref. 130435: Version 2024-1)
Threat to humans
Harmless
Human uses
Verktyg
Special reports
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5020 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02951 (0.01224 - 0.07115), b=2.91 (2.71 - 3.11), in cm total length, based on LWR estimates for this Genus-body shape (Ref.
93245).
Trofisk nivå (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Resiliens (Ref.
120179): Hög, lägsta populationsfördubblingstid mindre än 15 månader (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
