分類 / Names
俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa
Teleostei >
Siluriformes (Catfishes)
鯰形目 (Catfishes) >
Pimelodidae (Long-whiskered catfishes)
油鯰科 (Long-whiskered catfishes)
Etymology: Megalonema: Greek, megas, megalos = great + Greek, nema = filament (Ref. 45335); orixanthum: The specific name is in reference to the distribution of the species in the Orinoco basin and its relationship to the species Megalonema xanthum.
Environment: milieu / climate zone / 深度上下限 / distribution range
生態學
; 淡水 居於水底的.
South America: Orinoco River basin in Colombia and Venezuela.
大小 / 重量 / 年齡
成熟度: Lm ? range ? - ? cm
Max length : 11.6 cm SL 雄魚/尚未辨別雌雄; (Ref. 79495)
簡短描述
檢索表 | 型態特徵 | 形態測量圖
背棘 (總數) : 1; 背的軟條 (總數) : 7; 臀鰭軟條: 12 - 15; 脊椎骨: 43 - 45. Vertebrae including the Weberian complex (Ref. 79495).
Body shape (shape guide): elongated.
Life cycle and mating behavior
成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚
Lundberg, J.G. and W.M. Dahdul, 2008. Two new cis-Andean species of the South American catfish genus Megalonema allied to trans-Andean Megalonema xantum, with description of a new subgenus (Siluriformes: Pimelodidae). Neotrop. Ichthyol. 6(3):439-454. (Ref. 79495)
IUCN 瀕危狀態 (Ref. 130435: Version 2025-1)
無危 (LC) ; Date assessed: 25 November 2020
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Estimates based on models
Phylogenetic diversity index (參考文獻
82804): PD
50 = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00589 (0.00278 - 0.01246), b=3.09 (2.92 - 3.26), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
營養階層 (參考文獻
69278): 3.6 ±0.7 se; based on size and trophs of closest relatives
回復力 (參考文獻
120179): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low vulnerability (10 of 100).
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