Luvaridae are an unusual family of ray-finned fish which have only one extant species – the Louvar fish (Luvarus imperialis). Evolved during the Paleocene, Luvaridae body plan has remained fairly unchanged for 50 million years making it an incredibly successful ocean fish (despite there only being one living species). 

Part of the Acanthuriformes order (which are a diverse group containing many tropical reef fish families including Snappers and Butterflyfish), Luvaridae is the only pelagic (open-ocean swimmer) representative within this order. Louvar fish are known for eating soft-bodied organisms (like Jellyfish). This is an artistic reconstruction of Beerichthys ingens feeding at night on soft jellyfish.