Nuchequula mannusella is a small fish, growing to around 8 cm in length. They are completely covered in silvery scales with varying amounts of yellow coloration across all the fins. They have a darknuchalmarking.
Etymology
The specific name, mannusella, references the common name of the family by combining "mannus", Latin for "pony" in reference to the common name of the family, and "sella", Latin for "saddle", referencing the nuchal marking.