Cranoglanis is a small genus of large freshwater catfish native to rivers in China and Vietnam, and it is usually treated as the sole genus in its own family, Cranoglanididae — a lineage set apart from the more familiar bagrid and ictalurid catfishes by details of its skull and fin-spine anatomy. The common name "helmet catfish" points to the heavily ossified, shield-like bones covering the head. Species in the atlas run from about 11.5–17 in, putting Cranoglanis among the larger river catfish of the region rather than a small ornamental type, and like most big Asian river catfish it is a bottom-oriented omnivore and scavenger found in the main channels and lower reaches of river systems.
Cranoglanis is essentially absent from the aquarium hobby — its size alone makes it impractical for home tanks, and none of the five species in the atlas carry an established trade name beyond bouderius's "helmet catfish" tag. It matters more as a food and subsistence fish in parts of its native range, and as a subject of regional ichthyological survey work, than as an ornamental animal. The IUCN picture is mixed: one species is ranked Vulnerable, one Least Concern, and three have not yet been formally evaluated, which is typical for a genus that has drawn far more taxonomic than conservation attention.