Loricarioidei

Callichthyidae is a family of catfishes (order Siluriformes), called armored catfishes due to the two rows of bony plates (or scutes) along the lengths of their bodies. It contains some of the most popular freshwater aquarium fish, such as many species in the genus Corydoras.

Trichomycteridae is a family of catfishes commonly known as pencil catfishes or parasitic catfishes; though only certain species are parasitic, those are some of the few parasitic chordates known. This family is prohibited from being imported into various parts of the United States due to their reputation as parasites.

Astroblepus is a genus of freshwater ray-finned fishes belonging to the family Astroblepidae, the climbing catfishes or naked sucker-mouth catfishes. This genus is the only genus in its family. These catfishes are primarily found in torrential streams in the Andean area. Astroblepus pholeter and A. riberae are troglobites adapted to living in subterranean water systems. These species are typically small, less than . The largest species reaches . These fish have suckermouths like those of loricariids. They have two pairs of barbels, maxillary and nasal. The dorsal fin spine lacks a locking mech

Scoloplax is a genus of freshwater ray-finned fishes, it is the only genus in the monotypic family Scoloplacidae, the spiny dwarf catfishes. The catfishes in this genus are found in South America.

species of fish