分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Gymnotiformes (Knifefishes) >
Gymnotidae (Naked-back knifefishes) > Gymnotinae
Etymology: Gymnotus: Greek, gymnos = naked (Ref. 45335); varzea: Named for the whitewater várzea floodplain, which this species is restricted to..
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 底中水层性. 热带
South America: Amazon basin in Brazil and Peru.
南美洲: 在巴西与秘鲁的亚马孙河流域。
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 28.5 cm TL 雄鱼/尚未辨别雌雄; (Ref. 55508); 最大体重: 65.00 g (Ref. 55508)
简单描述
检索表 | 型态特徵 | 形态测量图
背棘 (总数) : 0; 背的软条 (总数) : 0; 臀鳍软条: 230 - 310. Distinguished from its congeners endemic to the Amazon and Orinoco Basins and the Guyana Shield in having a color pattern of 16-22 oblique dark pigment bands with wavy and irregular margins in which the majority of bands at midbody form X-shaped patterns (resembling metaphase chromosomes) and in which the dark bands are about twice as broad as the pale interbands. Further differs from its congeners in having the following unique combination of characters: clear (unpigmented) patch at the caudal end of the anal-fin membrane in specimens 6.0-23.7 cm; and bands never divided to form band pairs (Ref. 55508).
用波浪状而不规则的边缘在有一个方面与它的同类区分了亚马孙河的特有种与奥里诺科河流域与盖亚那盾甲 16-22 斜角的彩色斑纹深色的条纹在那一个在身体中央形式 x 的多数条纹-形状的图案 (与中期染色体相似) 与在那一个深色条纹是像灰白的 interbands 一样的宽大约两倍于。 进一步有别于它的同类有下列的独特组合特征: 在臀鳍薄膜的尾鳍末端在标本 6.0-23.7 公分的清澈的 (没有颜色) 小区块; 而且条纹从不分开形成条纹对.(参考文献 55508)
Facultative air-breathing in the genus (Ref. 126274); Found in root mats of floating meadows in floodplains (Ref. 55508). Gulps atmospheric air into the hypervascularized posterior chamber of its gas bladder (Ref. 55508). Feeds on small aquatic invertebrates such as chironomid larvae, insect nymphs and microcrustaceans (Ref. 55508).
在洪泛区中发现于漂浮草地的簇根了。 (参考文献 55508) 吞大气的空气进入它的气鳔的 hypervascularized 后室。 (参考文献 55508) 吃小的水生无脊椎动物例如宝刀鱼仔鱼, 昆虫的蛹与小型甲壳类动物。 (参考文献 55508)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
南美洲: 在巴西与秘鲁的亚马孙河流域。
Crampton, W.G.R., D.H. Thorsen and J.S. Albert, 2005. Three new species from a diverse, sympatric assemblage of the electric fish Gymnotus (Gymnotiformes: Gymnotidae) in the lowland Amazon basin, with notes on ecology. Copeia 2005(1):82-99. (Ref. 55508)
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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=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref.
93245).
营养阶层 (Ref.
69278): 3.2 ±0.40 se; based on food items.
回复力 (Ref.
120179): 高度, 族群倍增时间少于 15个月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (19 of 100).
