分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Gymnotiformes (Knifefishes)
電鰻目 (Knifefishes) >
Hypopomidae (Bluntnose knifefishes)
無齒刀魚科 (Bluntnose knifefishes)
Eponymy: Dr Janis Rácenis (1915–1980) was a Latvian-born Venezuelan entomologist and ornithologist. [...] (Ref. 128868), visit book page.
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 底中水層性. 熱帶
South America: known only from localities around San Fernando de Atabapo and San Carlos de Rio Negro, Territorio Amazonas, Venezuela.
南美洲: 桑河 Fernando de Atabapo 與桑河卡洛斯 de 尼格羅河， Territorio Amazonas ，委內瑞拉的周圍已知只來自地點了。
大小 / 重量 / 年齡
Maturity: Lm ? range ? - ? cm
Max length : 11.7 cm TL 雄魚/尚未辨別雌雄; (Ref. 26457)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
背棘 (總數) : 0; 背的軟條 (總數) : 0; 臀鰭軟條: 171 - 193; 脊椎骨: 94 - 97. Body abruptly attenuated caudally; 23 precaudal vertebrae; cranium higher than in other members of the family; anal rays covered by a thick tissue, giving an undulated shape to the anal fin; basibranchials not ossified (cartilaginous matrices); tail about 1/5 of anal fin base; lateral line incomplete; no scalation on dorsoanteriorly and middorsally.
身體突然地尾部地變細; 23個尾前椎; 頭蓋比較高的超過在該科的其他成員中; 臀鰭鰭條被一個厚的組織蓋著了, 給一個被波動的形狀到臀鰭; 基鰓骨不鈣化 (軟骨的矩陣); 尾部大約 1/5 臀鰭基底; 側線不完全的; 背面前面地與背面中央地上沒有鱗片。
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
南美洲: 桑河 Fernando de Atabapo 與桑河卡洛斯 de 尼格羅河， Territorio Amazonas ，委內瑞拉的周圍已知只來自地點了。
Albert, J.S., 2003. Hypopomidae (Bluntnose knifefishes). p. 494-496. In R.E. Reis, S.O. Kullander and C.J. Ferraris, Jr. (eds.) Checklist of the Freshwater Fishes of South and Central America. Porto Alegre: EDIPUCRS, Brasil. (Ref. 37053)
IUCN 瀕危狀態 (Ref. 130435: Version 2024-1)
無危 (LC) ; Date assessed: 01 September 2020
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00617 (0.00198 - 0.01923), b=3.06 (2.81 - 3.31), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (Ref.
69278): 3.1 ±0.4 se; based on size and trophs of closest relatives
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
