The Cyclopteridae are a family of marine fishes, commonly known as lumpsuckers or lumpfish, in the order Scorpaeniformes. They are found in the cold waters of the Arctic, North Atlantic, and North Pacific oceans. The greatest number of species are found in the North Pacific. The family name Cyclopteridae derives from the Greek words κύκλος (kyklos), meaning circle, and πτέρυξ (pteryx), meaning wing or fin, in reference to the circle-shaped pectoral fins of most of the fish in this family. Cyclopteridae includes the following valid genera: Aptocyclus De la Pylaie, 1835 Cyclopsis Popov, 1930 Cyclopteropsis Soldatov & Popov, 1929 Cyclopterus Linnaeus, 1758 Eumicrotremus Gill, 1862 Lethotremus Gilbert, 1896 Proeumicrotremus Voskoboinikova & Orlov, 2020
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