Taxonomy & naming
Ageneiosus magoi was described by Castillo and Brull in 1989 from the flooded esteros of Camaguán in Guárico, Venezuela. The Catalog of Fishes treats it as valid in the family Auchenipteridae. The genus is often called the bagre-style or tigerhead group in Spanish-speaking regions, and several species look alike, so identification needs preserved specimens.
Morphology
FishBase gives a maximum of 7 in SL. Members of the genus have a wide, terminal mouth, small eyes and a smooth skin without scales, and lack the long chin barbels typical of other catfishes. Specific colour pattern details for this species are not recorded in the sources used here.
Habitat
FishBase lists the species from the Orinoco basin in Venezuela and classifies it as a freshwater, pelagic, tropical fish. The type locality is a seasonally flooded wetland of the Venezuelan llanos. No temperature, pH or hardness values are recorded.
Feeding
Diet is not recorded in the FishBase entry. The genus as a whole includes fish-eating and invertebrate-eating species, so keepers should treat it as a carnivore.
Mating
Courtship and pairing are not recorded for this species. Auchenipterids in general fertilise internally, but that is documented for the family rather than this species.
Breeding
Breeding in captivity is not recorded for Ageneiosus magoi.
In the aquarium
Ageneiosus magoi is rarely kept. At 7 in SL it needs a large, long tank, dim light and driftwood or roots to retreat into by day. Keep it with fish too large to be swallowed. No water figures are recorded, so soft, slightly acidic, warm water typical of the Orinoco lowlands is a reasonable starting point.
Conservation
The IUCN Red List assessed Ageneiosus magoi as Least Concern in 2020. No species-specific threats are listed in the sources used here.