see text Ronquils (sometimes spelt ronchils) is a small family marine ray-finned fish, the Bathymasteridae.

The Bathymasteridae was first proposed as a family in 1883 by the American ichthyologists David Starr Jordan and Charles Henry Gilbert.

The family name Bathymasteridae is derived from the type genus Bathymaster and this can be translated from the Greek to mean "deep searcher".

The lateral line is clearly visible and runs on the upper body, straight to the rear of the dorsal fin, and has between 75 and 105 scales.

[5] Ronqulis inhabit cold waters in the North Pacific where they have a wide range from Baja California to the Sea of Japan, ronquils are benthic animals, spending most of their time on or near the bottom.

[7] Ronquils feed primarily on small benthic crustaceans and mollusks, and the stomachs of some specimens sampled contained only nudibranch]s. Little is known about predators of ronqulis but it is presumed that most larger carnivores that occur in the same areas as them, especially predatory fishes, will prey on them.