分类 / 名称
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Characiformes (Characins) >
Stevardiidae (Stevardiids) > Hemibryconinae
Etymology: Hemibrycon: Greek, hemi = half + Greek, bryko = to bite (Ref. 45335); sanjuanensis: Named for the San Juan River Basin, where the type series was collected.
环境：氛围 / 气候带 / 深度上下限 / 分布范围
生态学
; 淡水 底中水层性; pH range: 6.3 - 7.7; 深度上下限 0 - 3 m (Ref. 98056). 17°C - 22°C (Ref. 98056)
South America: upper San Juan River Basin, Tatamá River drainage in Colombia.
大小 / 重量 / 年龄
成熟度: Lm ? range ? - ? cm
Max length : 8.5 cm SL 雄鱼/尚未辨别雌雄; (Ref. 98056)
简单描述
检索表 | 型态特徵 | 形态测量图
背的软条 (总数) : 10 - 11; 脊椎骨: 39 - 41. Hemibrycon sanjuanensis can be distinguished from H. boquiae, H. brevispini, H. cairoense, H. colombianus, H. mikrostiktos, H. metae, H. palomae, H. rafaelense and H. tridens by having a circular or oblong humeral spot located two scales posterior to the opercle (vs. 3-4 scales in H. palomae, H. rafaelense, H. brevispini and H. cairoense, and 0-1 scales in H. metae and H. boquiae). It further differs from H. colombianus in having a round or oblong humeral spot (vs. rectangular). It can be diagnosed from H. beni, H. dariensis, H. divisorensis, H. helleri, H. huambonicus, H. inambari, H. jabonero, H. jelskii, H. mikrostiktos, H. polyodon, H. quindos, H. raqueliae, H. santamartae, H. surinamensis, H. taeniurus, H. tridens and H. yacopiae by the presence of melanophores on the posterior margins of the scales all along the sides of body (vs. absence of melanophores from margins of scales along entire length of sides of body). It is further distinguished from all congeners mentioned above by having the following characters: a wide, concave pelvicbone (vs. narrow and straight); middle part of the dorsal margin of the orbitosphenoid bone flattened and not in contact with frontal (vs. dorsal margin straight and in contact with frontal); ventral tip of supracleithrum bifurcate (vs. not bifurcate); six teeth in the outer premaxillary row arranged in a straight line (vs. five or fewer teeth in outer premaxillary row and not arranged in straight line, except H. cairoense with two to six teeth in the outer premaxillary row) (Ref. 98056).
Body shape (shape guide): elongated.
Found in streams characterized by relatively rapid water running over rocky and sandy substrates with high transparency. Occurs syntopically with Bryconamericus emperador, Astroblepus sp., Pimelodella sp. and Characidium sp. Feeds on adult and larval insects, nematodes, isopods, and unidentified arthropod fragments. The presence of autochthonous and some allochthonous items in the guts suggests that this species is insectivorous with considerable plasticity in its diet (Ref. 98056).
生命周期和交配行为
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
Román-Valencia, C., R.I. Ruiz-C., D.C. Taphorn and C.A. García-Alzate, 2014. A new species of Hemibrycon (Characiformes, Characidae) from the upper San Juan River drainage, Pacific versant, Colombia. ZooKeys 454:109-125. (Ref. 98056)
世界自然保护联盟红皮书 (Ref. 130435: Version 2025-2 (Global))
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特别资料
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网络资源
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=0.01122 (0.00514 - 0.02450), b=3.04 (2.87 - 3.21), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
营养阶层 (参考文献
69278): 3.0 ±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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