Taxonomy & naming
Notoglanidium macrostoma was described by Jacques Pellegrin in 1909 and is the valid name in the Catalog of Fishes. The parentheses in the authority show that it was first placed in a different genus. It sits in the Auchenoglanididae, a family of African catfishes once folded into the Bagridae, which is why the atlas shelves it with the bagrid cats. Wet Spot and Dan's Fish have both sold it under its scientific name.
Morphology
FishBase gives a maximum length of 11 in SL for males or unsexed fish, so this is a catfish for a large tank, not a dwarf. The epithet means large mouth, and the wide gape fits the varied animal diet FishBase records.
Habitat
The type locality is the Ogowe River at Ngomo in Gabon. FishBase lists the species as freshwater and tropical, with a temperature range of 73–81 °F, a pH of 6.5 to 8 and a hardness of 4 to 25 dH.
Feeding
FishBase reports a wide diet that includes fish fry and eggs, crustaceans, insect larvae and plant material. That describes an omnivorous, opportunistic feeder that will eat any tankmate small enough to fit its mouth.
Mating
Courtship has not been described.
Breeding
No spawning or egg information is recorded, and aquarium breeding is not documented.
In the aquarium
At close to 11 in SL it needs a large tank with caves or driftwood to rest in, and it should not be kept with small fish. Offer meaty sinking foods, with some vegetable matter, after lights-out. Keep the water within the FishBase ranges of 73–81 °F and pH 6.5 to 8.
Conservation
IUCN assessed the species as Least Concern on 16 February 2009. No specific threat is recorded for it.