分類 / 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); georgiae: Named in honor of the wife of the describer (Ref. 27188).
Eponymy: Georgette Géry was the wife of the author Dr Jacques Géry (1917–2007) (q.v.). Although the original text was silent, the author later revealed that this was the lady honoured. (Also see Georgia) (Ref. 128868), visit book page.
More on author: Géry.
Issue
See Géry (1977: 446) for identification key.
Environment: milieu / climate zone / depth range / distribution range
生態学
; 新鮮な水 外洋の. Tropical
South America: Sipaliwini, Maroni, Mana, Sinamary, Comté, Approuagua, and Oyapock River basins.
サイズ / 重さ / 年齢
Maturity: Lm ? range ? - ? cm
Max length : 12.1 cm SL オス/雌雄の選別がない; (Ref. 101566)
簡単な記述
検索表 | 形態学 | 形態計測学
背鰭 (合計) : 9; 臀鰭: 23 - 27; 脊つい: 29. This species is distinguished from its congeners, except T. rarus, by the number of scale rows between lateral line and pelvic fin origin 4.5-5.5 (vs. 3.5 scale rows); differs from T. rarus by the longitudinal dark stripes on the trunk which is absent (vs. present); differs from T. anostomus, T. denticulatus, T. kuluene, T. juruena by the principal teeth in dentary 4 (vs. 5-6) with larger and more robust teeth (vs. thinner and sharper teeth); differs from T. anostomus, T. kuluene by the conspicuous humeral marks 2 (vs. 1 and inconspicuous); differs from T. anostomus by the mouth being terminal (vs. subsuperior); differs from T. anostomus, T. araguaiensis with gill rakers on the lower limb of the first gill arch 10-12 (vs. 17-20) and upper limb 7-8 (vs. 10-12); differs from T. argenteus by the predorsal scales 8 (vs. 11-17), and from T. carvalhoi by having a rounded dark mark on the caudal peduncle (vs. a lozenge-shaped); differs from T. ommatus by teeth on maxilla 1-4 (vs. 7-8) and with a dark mark centered on caudal peduncle (vs. mark limited to the posterior portion of the caudal peduncle) (Ref. 124043).
Occupies the counter current zones of rivers where it hides under the rocks. It is constantly on the look out for food items that fall into the water (Ref. 12225).
Life cycle and mating behavior
成熟 | 繁殖 | 放精 | 卵 | 生産力 | 幼生
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のレッドリストの状況は (Ref. 130435: Version 2024-2)
Human uses
用具
特記事項
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インターネットの情報源
Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02692 (0.01380 - 0.05249), b=2.94 (2.77 - 3.11), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
栄養段階 (Ref.
69278): 3.2 ±0.4 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高い, １５か月以下の倍増期間の最小個体群 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
