Microglanis is a genus of small, secretive catfish in the family Pseudopimelodidae — sometimes called bumblebee or dwarf marbled catfish for their mottled black-and-cream or black-and-yellow patterning — distributed across the rivers and streams of South America, with the bulk of species recorded from Brazil and further records from Ecuador, Argentina, French Guiana, Guyana, Paraguay, Uruguay and Venezuela. They are short, broad-headed, wide-mouthed ambush predators with a squat, pimelodid-like build, rarely exceeding about 4.5 in, and spend their days tucked into cover before hunting small invertebrates and fish fry after dark.
A handful of species are genuinely popular in the aquarium trade under the bumblebee catfish name — M. iheringi and M. leptostriatus in particular are regularly available and valued for their bold pattern and manageable size, though their nocturnal, ambush-predator instincts mean they will take much smaller tankmates. Most Microglanis in the atlas are Least Concern or unassessed, with only single species flagged Near Threatened and Vulnerable, so the genus as a whole does not appear to be under heavy pressure, though data for many South American members remain thin.