Source: FAO 2002.
| Family | Scientific Name | Author | Year | Common Name |
| Trichiuridae | Benthodesmus simonyi | (Steindachner) | 1891 | North Atlantic Frostfish |
All Benthodesmus Species: Caudal fin present, small, and forked. Pelvic fins present, but strongly reduced, modified to a scale-like process (flattened spine) with 0-2 tiny soft rays. Head profile rising very gradually from tip of snout to origin of dorsal fin, without forming a sagittal crest. Spinous part of dorsal fin long (not shorter than half of soft-ray part), with 38-46 not very weak spines well-differing from subsequent rays), divided by notch from soft-ray part.
Benthodesmus simonyi
Unique Characteristics: Scale-like pelvic fins inserted behind pectoral-fin base. Total dorsal-fin elements 148-155.
Similar Species: Slender Frostfish, Benthodesmus tenuis. Scale-like pelvic fins inserted before pectoral-fin base. Total dorsal-fin elements 125-129.
FAO 2002.