Source: Mayer (1974).
| Family | Scientific Name | Author | Year | Common Name |
| Epigonidae | Epigonus pectinifer | Mayer | 1974 | Combgill Deepwater Cardinalfish |
All Epigonus Species: One bony or poorly ossified opercular spine (sometimes absent).Anal fin with 1 or 2 spines and 9 or 10 (rarely 8) rays. Edges of infraorbital bones smooth. Anal fin with 2 spines and 9 segmented rays. First dorsal-fin spines 7 or 8. Maxilla reaching well beyond vertical through anterior margin of eye. Gill rakers on lower limb of first arch 14 or more.
Epigonus pectinifer
Unique Characteristics: Opercular spine bony and strong.
Similar Species:
Caudal-ring Deepwater Cardinalfish, Epigonus pandionis
Source: Mayer (1974).
Caudal-ring Deepwater Cardinalfish, Epigonus pandionis. Opercular spine weak, poorly ossified or absent. Body depth 22.0-30.0% and length of caudal peduncle 22.0-27.0% standard length. First dorsal-fin spine long, 5.0-8.5% standard length.
Pencil Deepwater Cardinalfish, Epigonus denticulatus.
Source: Mayer (1974).
Pencil Deepwater Cardinalfish, Epigonus denticulatus. Opercular spine weak, poorly ossified or absent. Body depth 16.0-24.0% and length of caudal peduncle 26.0-32.0% standard length. First dorsal-fin spine short, 2.5-4.0% standard length.
Reference:
Mayer, G.F. 1974. A revision of the cardinal fish genus Epigonus (Perciformes, Apogonidae), with descriptions of two new species. Bull. Mus. Comp. Zool. 146(3): 147-203.