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Teleostei >
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).
More on authors: Spix & Agassiz.
环境：氛围 / 气候带 / 深度上下限 / 分布范围
生态学
; 淡水 大洋性; pH range: 5.0 - 7.5; dH range: ? - 20. 熱帶; 20°C - 28°C (Ref. 1672)
South America: Amazon basin (including rio Tocantins), Orinoco and the Atlantic drainages of the Guianas (Essequibo, Corantijn and Marowijne river basins).
南美洲: 亞馬遜河流域， Rio 舊金山，委內瑞拉, 與圭亞那。
大小 / 重量 / 年龄
成熟度: Lm ? range ? - ? cm
Max length : 12.7 cm TL 雄鱼/尚未辨别雌雄; (Ref. 111518); 最大体重: 40.20 g (Ref. 111518)
背的软条 (总数) : 9; 臀鳍软条: 26 - 33; 脊椎骨: 30 - 31. This species is distinguished from T. anostomus, T. denticulatus, T. juruena, T. kuluene by the principal teeth on dentary 4 (vs. 5-6), and having larger and more robust teeth (vs. thinner and sharper teeth); differs from T. anostomus, T. araguaiensis by the gill-rakers on lower limb of the first gill arch 11-14 (vs. 17-20); differs from T. carvalhoi by the rounded dark mark on the caudal peduncle (vs. lozenge-shaped); differs from T. anostomus by having a terminal mouth (vs. subsuperior); differs from T. anostomus, T. kuluene by the conspicuous humeral marks 2 (vs. 1); differs from T. argenteus by the predorsal scales 7-9 (vs. 11-17); differs from T. franciscoensis by the number of olfactory lamellae 20-40 (vs. 11-17) and by having more robust teeth on dentary (vs. thinner and sharper teeth); differs from T. denticulatus by having humeral marks separated by a single vertical scale row (vs. marks separated by three vertical scale rows); differs from T. rarus by lacking the longitudinal dark stripes on the trunk (vs. presence); 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. ommatus by the teeth on the maxilla 1-4 (vs. 7-8) and by having a conspicuous dark mark on the caudal peduncle (vs. inconspicuous and limited to the posterior part of the caudal peduncle) (Ref. 124043)
Cross section: compressed.
Occurs in creeks with rapidly flowing water over sandy areas and slow flowing water over plant debris (Ref. 12225).
用在植物残枝上的在沙地与慢流动的水上快速流动的水出现于小溪。 (参考文献 12225)
生命周期和交配行为
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
南美洲: 亞馬遜河流域， Rio 舊金山，委內瑞拉, 與圭亞那。
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)
世界自然保护联盟红皮书 (Ref. 130435: Version 2025-2 (Global))
人类利用
渔业: 商业性; 水族馆: 商业性
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特别资料
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基于模型的估算
系统发育多样性指数 (参考文献
82804): PD
50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.02399 (0.01447 - 0.03977), b=3.01 (2.87 - 3.15), in cm total length, based on LWR estimates for this species & Genus-body shape (Ref.
93245).
营养阶层 (参考文献
69278): 3.6 ±0.4 se; based on size and trophs of closest relatives
渔业脆弱性 (Ref.
59153): Low vulnerability (10 of 100).
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