Premaxilla and maxilla long and slender, firmly united posteriorly; anterior tip of premaxilla expanded dorsally and diverging laterally; highly distensible mouth and stomach. Placed in the Percoidei in Gosline (1971).
Four genera, Chiasmodon, Dysalotus, Kali (synonym Gargaropteron), and Pseudoscopelus, with about 15 species (e.g., Johnson and Cohen, 1974; McEachran and Sutton, 2003). The last genus bears photophores.
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