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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); franciscoensis: Named for the Rio São Francisco, where the species is well known and abundant; an adjective.
Environment: milieu / climate zone / depth range / distribution range
Sinh thái học
; Nước ngọt gần đáy. Tropical
South America: Brazil.
Bộ gần gũi / Khối lượng (Trọng lượng) / Age
Maturity: Lm ?  range ? - ? cm
Max length : 11.7 cm SL con đực/không giới tính; (Ref. 130067); Khối lượng cực đại được công bố: 55.00 g (Ref. )
Short description
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Các vây lưng mềm (tổng cộng) : 9; Tia mềm vây hậu môn: 27 - 32; Động vật có xương sống: 30. This species is distinguished from its congeners, except T. anostomus, by the following characters: olfactory lamellae 11-17 (vs. 20-41); differs from T. anostomus, T. araguaiensis with gill rakers on lower limb 11-14 (vs. 17-20); differs from T. anostomus, T kuluene by having 2 distinct humeral marks (vs. 1); differs from T. ommatus by having maxillary teeth 1-4 (vs. 7-8) and by having a mark centered on the caudal peduncle (vs. mark on the posterior portion of the caudal peduncle); differs from T. rarus without dark stripes on the flank (vs. present); differs from T. georgiae, T. rarus by having 3.5 scale rows between lateral line and pelvic-fin origin (vs. 4.5-5.5); differs from T. argenteus by predorsal scales 7-9 (vs. 11-17); differs from T. denticulatus by having humeral marks separated by only one vertical scale row (vs. humeral marks separated by three vertical scale rows). differs from T. chalceus by dentary having thinner and sharper principal teeth (vs. more robust teeth) (Ref. 124043).
Life cycle and mating behavior
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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
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = No PD50 data [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.03311 (0.01690 - 0.06487), b=2.90 (2.73 - 3.07), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
Mức dinh dưỡng (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
Thích nghi nhanh (Ref.
120179): Chiêù cao, thời gian nhân đôi của chủng quần tối thiểu là dưới 15 tháng (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).