Trichomycterus davisi, for example, is an extreme case where the polymorphism was present within a single chimeric individual.
Most species of this genus have been reassigned to the genus Trichomycterus.
Species of Trichomycterus inhabit a diversity of habitats throughout South and Central America from Costa Rica in the north to Patagonia in the south, and from lowland Atlantic rainforest in the east to Andean streams in the west.