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> Siluriformes (Catfishes) > Pimelodidae (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 / Tiefenbereich / distribution range Ökologie

; süßwasser demersal. Tropical

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South America: Amazon River basin, Brazil, Guyana, Peru, Bolivia and probably Colombia and Ecuador.

Size / Gewicht / Alter

Geschlechtsreife: L_m ? range ? - ? cm
Max length : 24.1 cm SL Männchen/unbestimmt; (Ref. 125983); 31.2 cm SL (female); max. veröff. Gewicht: 221.09 g (Ref. 125983); max. veröff. Gewicht: 221.09 g

Kurzbeschreibung Bestimmungsschlüssel | Morphologie | Morphometrie

Rückenflossenstacheln (insgesamt) : 1; Rückenflossenweichstrahlen (insgesamt) : 7; Afterflossenweichstrahlen: 12 - 16; Wirbelzahl: 42 - 45. Total vertebrae including Weberian complex (Ref. 79495).
Body shape (shape guide): elongated.

Life cycle and mating behavior Geschlechtsreife | Fortpflanzung | Ablaichen | Eier | Fecundity | Larven

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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 Rote Liste Status (Ref. 130435: Version 2024-2)

nicht bedroht (LC) ; Date assessed: 29 December 2020

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Bedrohung für Menschen

Harmless

Nutzung durch Menschen

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Estimates based on models

Phylogenetic diversity index (Ref. 82804): PD₅₀ = 0.5039 [Uniqueness, from 0.5 = low to 2.0 = high].

Bayesian length-weight: a=0.00813 (0.00524 - 0.01261), b=3.17 (3.04 - 3.30), in cm total length, based on LWR estimates for this species & (Sub)family-body (Ref. 93245).

Trophic level (Ref. 69278): 4.0 ±0.7 se; based on size and trophs of closest relatives

Widerstandsfähigkeit (Ref. 120179): hoch, Verdopplung der Population dauert weniger als 15 Monate. (Preliminary K or Fecundity.).

Fishing Vulnerability (Ref. 59153): Low to moderate vulnerability (28 of 100). 🛈

Megalonema amaxanthum Lundberg & Dahdul, 2008