The closest relative of Lasiognathus is Thaumatichthys, which also has enlarged and hinged premaxillaries, escal denticles, and a branched upper operculum.
The Lasiognathus amphirhamphus lives in the bathypelagic, marine, depth range 1200 - 1305 m environment.
* Lasiognathus amphirhamphus This species is characterized by having only two (as opposed to three) bony hooks on its esca, which are lightly pigmented. More