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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); 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.

环境：氛围 / 气候带 / 深度上下限 / 分布范围生态学

; 淡水大洋性.

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South America: middle portion of the Rio Araguaia in Brazil.

大小 / 重量 / 年龄

成熟度: L_m ? range ? - ? cm
Max length : 6.3 cm SL 雄鱼/尚未辨别雌雄; (Ref. 93280)

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背的软条 (总数) : 9; 臀鳍软条: 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).
Body shape (shape guide): short and / or deep; Cross section: compressed.

系统发育多样性指数 (参考文献 82804)	PD₅₀ = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight	a=0.02570 (0.01057 - 0.06253), b=2.98 (2.79 - 3.17), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245).
营养阶层 (参考文献 69278)	3.4 ±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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Tetragonopterus araguaiensis Silva, Melo, Oliveira & Benine, 2013

分类 / 名称 俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa

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世界自然保护联盟红皮书 (Ref. 130435: Version 2025-2 (Global))

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CMS (Ref. 116361)

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分类 / 名称俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa

环境：氛围 / 气候带 / 深度上下限 / 分布范围生态学

分布领土 | FAO区域 | 生态系 | 标本纪录 | 分布图 | 简介 | Faunafri

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