Zoarcoidei

Pholidae is a family of marine ray-finned fishes, known as gunnels, in the scorpaeniform suborder Zoarcoidei. These are fishes of the littoral zone and are mainly found in North Pacific Ocean, with two species found in the North Atlantic Ocean and Arctic Ocean.

Stichaeidae, the pricklebacks or shannies, are a family of marine ray-finned fishes in the suborder Zoarcoidei of the order Scorpaeniformes. Most species are found in the North Pacific Ocean with a few in the North Atlantic Ocean.

Ronquils (sometimes spelt ronchils) is a small family marine ray-finned fish, the Bathymasteridae. These fishes are found only in Arctic and North Pacific waters. This family contains just seven species in three genera. The larger species are important to commercial fisheries as food fish. Ronquils are most closely related to the eelpouts and prowfish in the suborder Zoarcoidei of the order Scorpaeniformes.

Zoarcoidei is a suborder of marine ray-finned fishes belonging to the order Perciformes. The suborder includes the wolffishes, gunnels and eelpouts. The suborder includes about 400 species. These fishes are predominantly found in the boreal seas of the Northern Hemisphere but they have colonised the Southern Hemisphere. Many members of this suborder are extremophiles adapted to deepwater ecosystems (including hydrothermal vents) and polar waters.

The graveldiver (Scytalina cerdale) is a species of scorpaeniform fish, the only species in the genus Scytalina and the family Scytalinidae. Graveldivers are small, with snake-like heads (hence the generic name). Their bodies are compact, and lack pelvic fins, with very small pectoral fins. Their range encompasses the coastal area from the Bering Sea to central California.