Bathypterois grallator (Goode and Bean 1886; Sulak 1975; up to 43cm long excluding fin tips) is the extant tripod fish, so named because it stands on extended pelvic and caudal fin tips in the seafloor ooze, facing the current, waiting for tiny planktonic crustacean prey and conspecific mates to come by. If no mates come by, each individual is capable of producing both sperm and eggs. It is traditionally derived from Aulopus, but here nests closer to Rachycentron. Ossification is reduced at depth because calcium carbonate is not present at high pressures.

Eurypholis boissiieri (Smith Woodward 1901, Sepkoski 2002, Cretaceous, Cenomian, 12–17cm) has tiny marginal teeth and large palatal and dentary fangs. The traditional drawing (above) seems to exaggerate the skull size. Note the pointed operculum and primitive fins

Massamorichthys wilsoni (Murray 1996; up to 20cm; Paleocene) is a small extinct transitional taxa linking shallows dwelling Lepidogalaxias to deep sea Gonostoma.

Enchodus petrosus (Smith Woodward 1901, Late Cretaceous) is a predator fish with oversized palatal and dentary fangs. Complete specimens are rare.