The Loricariidae are the largest family of catfish (order Siluriformes), with 92 genera and just over 680 species to date, with new species being described each year. Loricariids originate from fresh water habitats of Costa Rica, Panama, and tropical and subtropical South America. These fish are noted for the bony plates covering their bodies and their suckermouths. Several genera are sold as "plecos", notably the suckermouth catfish, Hypostomus plecostomus, and are popular as aquarium fish.

Read more about Loricariidae:  Common Names, Taxonomy and Evolution, Distribution and Habitat, Description and Biology, Genetics, Ecology, In The Aquarium

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Loricariidae - In The Aquarium
... Most species of loricariids are nocturnal and will shy away from bright light, appreciating some sort of cover to hide under throughout the day ... As they often originate from habitats with fast-moving water, filtration should be vigorous ...