Megalonema Xanthum (Megalonema xanthum) is a ray-finned fish of the family Pimelodidae. It inhabits freshwater waters in benthic environments. This species can reach a maximum total length of 15.9 cm. With a trophic level of 3.8, it is a mid-level predator. It is assessed as Least Concern on the IUCN Red List.
Dorsal spines (total): 1; Dorsal soft rays (total): 7; Anal soft rays: 13 - 16; Vertebrae: 45 - 48. Total vertebrae 45-48 including Weberian complex .: elongated.
Behavioural data for Megalonema Xanthum is currently being reviewed.
Freshwater; demersal. Tropical South America: endemic to the Magdalena River basin in Colombia.
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