Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Actinopterygii (ray-finned fishes) > Characiformes
(Characins) > Characidae
(Characins) > Tetragonopterinae
Etymology: Tetragonopterus: Greek, tetra = four + Greek, gonia = angle + Greek, pteron = wing, fin (Ref. 45335); 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
Freshwater; benthopelagic. Tropical
South America: middle portion of the Rio Araguaia in Brazil.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 6.3 cm SL male/unsexed; (Ref. 93280)
Morphology | Morphometrics
soft rays: 37 - 40. Diagnosed from all congeners except Tetragonopterus anostomus by the number of gill rakers on the upper and lower limbs of the first gill arch (18-20/10-12 vs. 12-14/8-10, respectively). Differs from T. anostomus byhaving terminal position of the mouth (vs. subsuperior). Can be futher distinguished from T. anostomus and T. denticulatus in the number of principal teeth in the dentary (four vs. five or six) and also by having relatively robust teeth with blunted cusps (vs. relatively smaller teeth with somewhat sharper cusps); from T. argenteus by the number of predorsal scales (7-9 vs. 12-16); from T. carvalhoi by having a rounded spot on the caudal peduncle (v. a lozenge-shaped spot); and from T. rarus by the lack of dark stripes on the lateral surface of the body (vs. the presence of such stripes) (Ref. 93280).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Silva, G.S.C., B.F. Melo, C. Oliveira and R.C. Benine, 2013. Morphological and molecular evidence for two new species of Tetragonopterus (Characiformes: Characidae) from central Brazil. J. Fish Biol. (Ref. 93280)
IUCN Red List Status (Ref. 115185)
CITES (Ref. 115941)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5020 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02239 (0.00845 - 0.05934), b=2.99 (2.76 - 3.22), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.2 ±0.4 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
Vulnerability (Ref. 59153
): Low vulnerability (10 of 100) .