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Teleostei > Characiformes (Characins) > Acestrorhamphidae (American tetras) > Acestrorhamphinae
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mythology (Ref. 45335); eremus: From the Latin adjective eremus, meaning alone or uninhabited, in allusion to the absence of other fish species in the type locality.
Eponymy: Astyanax was the son of Hector in Greek mythology. See Homer’s Iliad for details. The reasoning for its use for a genus of characins is not explained. (Ref. 128868), visit book page.
Etymology: Astyanax: The name of Astyanax, Hector´s son in the Greek mythology (Ref. 45335); eremus: From the Latin adjective eremus, meaning alone or uninhabited, in allusion to the absence of other fish species in the type locality.
Eponymy: Astyanax was the son of Hector in Greek mythology. See Homer’s Iliad for details. The reasoning for its use for a genus of characins is not explained. (Ref. 128868), visit book page.
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.
分布 领土 | FAO区域 | 生态系 | 标本纪录 | 分布图 | 简介 | Faunafri
South America: Rio Canivete, upper rio Iguaçu, rio Paraná drainage in Brazil.
首次成熟时的长度 / 大小 / 重量 / 年龄
简单描述 检索表 | 型态特徵 | 形态测量图
背的软条 (总数) : 11; 脊椎骨: 38. Astyanax eremus belongs to A. scabripinnis species complex . It differs from all members of this species complex by having a subterminal mouth in specimens larger than 4.82 cm SL (vs. mouth terminal in all species). It is further distinguished from all species from this complex, except A. guaricana, A. gymnogenys, A. laticeps, A. obscurus, A. paranae, A. pirabitira A. scabripinnis, A. serratus, and A. varzeae by having 39-41 lateral line scales (vs. 31-38). It can be diagnosed from A. gymnogenys A. laticeps, A. obscurus, A. scabripinnis and A. serratus by its shallower body depth (27.3-31.3% vs. 35.7-39.0%, 35.3-40.6%, 31.6-40.8%, 33% and 34.2-39.7% of SL, respectively). It differs from A. paranae by its longer snout length (21.8-26.8% vs. 16.0-20.4% of HL); from A. guaricana by its shorter interorbital width (23.5-28.4% vs. 32.7-40.9% of HL) and shorter head length (27.1-32.5% vs. 23.9-26.6% of SL); from A. varzeae by its shorter interorbital width (23.5-28.4% vs. 29.8-37.7% of HL), by relatively shorter caudal peduncle length (13.3-16.3%, modally 14.9%, vs. 10.5- 13.9%, modally 12.4%, of SL) and relatively longer snout length (21.8-26.8%, modally 24.5%, vs. 16.4-23.3%, modally 20.1%, of HL); from A. pirabitira by having four to five cusps on the second to fourth tooth in the inner premaxillary series (vs. seven cusps). It can be distinguished from A. burgerai, A. intermedius, A. jacobinae, A. leonidas, A. microschemos, A. ojiara, A. turmalinensis, A. laticeps, A. obscurus, A. pirapuan, A. rivularis, A. serratus, and A. troya by the shape of humeral spot (straight, very narrow and height, occupying two or two and a half scales wide and about six scales height, vs. wide and short with curved or rounded portions, occupying three or more scales wide and less than six scales height in the former seven species and with upper portion wide and something rounded with a vertical projection in A. laticeps, A. obscurus, A. pirapuan, A. serratus, and A. troya) (Ref. 96865).
Body shape (shape guide): elongated.
Body shape (shape guide): elongated.
Occurs in Rio Canivete that runs through a grove of about 1,000 m long and 150 m wide, where the sampling point is located. The sample site was located within the grove with about 0.5-1.0 m depth and about 5 m width, lentic transparent water and sandy and clay bottom variably covered by fallen trees, branches and leaves (Ref. 96865).
生命周期和交配行为 成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
主要参考文献
上传您的参考资料 | 参考文献 | 合作者 | 合作者
Ingenito, L.F.S. and L.F. Duboc, 2014. A new species of Astyanax (Ostariophysi: Characiformes: Characidae) from the upper rio Iguaçu basin, southern Brazil. Neotrop. Ichthyol. 12(2):281-290. (Ref. 96865)
世界自然保护联盟红皮书 (Ref. 130435: Version 2025-2 (Global))
极度濒危 (CR) (B2ab(iii)); Date assessed: 07 November 2018
CITES
Not Evaluated
对人类的威胁
人类利用
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遗传学
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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): PD50 = 0.5000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01047 (0.00452 - 0.02424), b=3.11 (2.93 - 3.29), in cm total length, based on LWR estimates for this Genus-body shape (Ref. 93245).
营养阶层 (参考文献 69278): 2.9 ±0.4 se; based on size and trophs of closest relatives
回复力 (参考文献 120179): 高度, 族群倍增时间少于 15个月 (Preliminary K or Fecundity.).