Sea devils are a family, Ceratiidae, of deep-sea anglerfishes.
They are among the most widespread of the anglerfishes, being found in all oceans, from tropical to Antarctic. They are large, elongate anglerfishes: females of the largest species, Krøyer's deep sea angler fish, Ceratias holboelli, reach 1.2 m in length. The males, by contrast, are dwarfed, reaching 14 cm. As in other anglerfishes, males spend much of their lives parasitically attached to the females, but they have a free-living adolescent stage in which they are very small (at most 1.3 cm), and have sharp, beak-like, toothless jaws.