Source: FAO 2002.
| Family | Scientific Name | Author | Year | Common Name |
| Melamphaidae | Scopeloberyx opisthopterus | (Parr) | 1933 | Ridgehead |
All Scopeloberyx Species: Smaller scales, more than 20 transverse scale rows from nape to caudal base (scales mostly lost, leaving discernible scale pockets). Scales on cheek 2 or 3 (often lost, leaving discernible scale pockets). Supramaxilla present. Ridges on top of head not crest-like with edges smooth. No conspicuous dorsally-directed spine between nostrils. Ventral edge, angle, and posterior edge of preopercle smooth. Total number of dorsal-fin elements (spines plus rays) less than 16.
Scopeloberyx opisthopterus
Unique Characters: Dorsal spines 2 or 3; dorsal soft rays 11 or 12. Anal spines: 1; anal soft rays 7 or 8. Body slender blunted anteriorly. Eye small (https://www.fishbase.se/summary/Scopeloberyx-opisthopterus).
Similar Species:
Scopeloberyx robustus, Longjaw Bigscale
Longjaw Bigscale, Scopeloberyx robustus. Dorsal spines 2 or 3; dorsal soft rays 10-13. Anal spines 1; anal soft rays 7-9. Transverse rows of scales, 28. Gill rakers on the first arch 14-17. Dark brown body; black head, mouth, and branchial cavity; pigmented fins (https://fishbase.se/summary/Scopeloberyx-robustus).