Source: FAO 2002.
| Family | Scientific Name | Author | Year | Common Name |
| Halosauridae | Halosaurus macrochir | (Gunther) | 1878 | Abyssal Halosaur |
All Halosaurs: Mouth inferior, overhung by snout. Dorsal fin short-based, on midtrunk, slightly closer to anus than to tip of snout. All rays segmented (the anteriormost ray reduced and unsegmented in Aldrovandia). Anal fin long, extending from just behind anus to tip of tail (FAO 2002).
Halosauropsis macrochir
Unique Characteristics: First dorsal-fin ray as long as second and segmented. Scales on opercle. Sheath of lateral line darkly pigmented in adults.
Similar Species: None