A new deepwater assfish, <Emphasis Type="Italic">Bassozetus nielseni</Emphasis> sp. nov. (Ophidiiformes: Ophidiidae), from the North Atlantic and West Indian oceans

A new deepwater assfish, Bassozetus nielseni sp. nov., is described from 29 specimens 147–615 mm in standard length (SL)] collected from the North Atlantic and West Indian oceans. It is distinguished from 13 congeners by the following combination of characters: dorsal-fin rays 122–129, long rakers on first gill arch 11–14, oblique scales 20–25, abdominal vertebrae 13–14, head length 18.1–21.3 % SL, body depth at anal-fin origin 8.2–14.6 % SL, predorsal length 16.4–20.1 % SL, tail length 62.7–68.0 % SL, posterior tip of pelvic-fin rays anterior to anus, a single median basibranchial tooth patch, dorsal margin of sagittal otolith smooth, and fins pale yellowish brown (preserved condition).