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); amaxanthum: The specific name refers to the distribution of the species in the Amazon basin and its relationship to the species Megalonema xanthum..
Environment: milieu / climate zone / depth range / distribution range
生態學
; 淡水 居於水底的.
South America: Amazon River basin, Brazil, Guyana, Peru, Bolivia and probably Colombia and Ecuador.
大小 / 重量 / 年齡
Maturity: Lm ?  range ? - ? cm
Max length : 24.1 cm SL 雄魚/尚未辨別雌雄; (Ref. 125983); 31.2 cm SL (female); 最大體重: 221.09 g (Ref. 125983); 最大體重: 221.09 g
簡短描述
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 - 16; 脊椎骨: 42 - 45. Total vertebrae including Weberian complex (Ref. 79495).
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)
無危 (LC) ; Date assessed: 29 December 2020
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00776 (0.00501 - 0.01204), b=3.18 (3.05 - 3.31), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref.
93245).
營養階層 (Ref.
69278): 4.0 ±0.7 se; based on size and trophs of closest relatives
回復力 (Ref.
120179): 高度, 族群倍增時間少於 15個月 (Preliminary K or Fecundity.).
Fishing Vulnerability (Ref.
59153): Low to moderate vulnerability (28 of 100).